CN107389189B - A kind of miniaturization photo-electricity detector with differential amplification function - Google Patents
A kind of miniaturization photo-electricity detector with differential amplification function Download PDFInfo
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- CN107389189B CN107389189B CN201710614963.4A CN201710614963A CN107389189B CN 107389189 B CN107389189 B CN 107389189B CN 201710614963 A CN201710614963 A CN 201710614963A CN 107389189 B CN107389189 B CN 107389189B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J1/46—Electric circuits using a capacitor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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Abstract
A kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, belongs to photoelectric technology and electronic integrated circuit technical field.The present invention is mainly made of photoelectric detection module and differential amplifier circuit module.Photoelectric detection module is responsible for collecting the outgoing optical signal of testing laser device, including two sets of photodiodes and two sets of protection shells.Differential amplifier circuit module is used to carry out differential amplification processing to detectable signal, is mainly made of first order amplifying circuit, two-way voltage follower, second level differential amplifier circuit.It include two parallel amplifying circuit branches in first order amplifying circuit, the photoelectric current that input is detected from photoelectric detection module, subsequent differential amplification processing is done in output after two amplifying circuits respectively amplify two-way photo-signal.Technical problems to be solved are to provide high sensitive, high s/n ratio, miniaturization, high load capacity, the miniaturization photo-electricity detector with differential amplification function, are capable of the gain of the big circuit of equiblibrium mass distribution front and back stages.
Description
Technical field
The present invention relates to photoelectric technology and electronic integrated circuit technical field, more particularly to it is a kind of for exploring laser light and right
Low noise, high load capacity, the miniaturization photo-electricity detector of photoelectric current progress differential amplification.
Background technique
Currently, photodetector have in the field of photoelectric technology such as laser frequency stabilization, laser phase-locked, laser beat frequency it is important
Application value.And the photodetector of differential amplification function is had, faint optical power can be believed according to the power of target laser
It number is converted to current signal and completes the processing of differential amplification, lay a good foundation for laser signal processing.
Photoelectron technology and electronic circuit technology are combined into one by the miniaturization photo-electricity detector with differential amplification function
Body.Mainly it is made of photodiode, amplifying circuit, voltage follower circuit, difference channel.
The laser that the optical path that the photodiode of photodetector with differential amplification function can receive transmits, by light intensity
Signal is converted to current signal, is turned current signal by the preposition pull down resistor of circuit board first order opamp input terminal
Formation voltage signal, and light is detected to two beams by the two-stage calculation amplifier of differential amplifier circuit and is carried out at voltage differential amplification
Reason.To improve the performance of the photodetector with differential amplification function, it is necessary to improve photodiode and amplifying circuit
Performance.In general, photodetector is capable of handling faint laser signal, and this requires the photodiodes of photodetector
Radiosusceptibility with higher and amplifying circuit gain with higher.But when amplification factor is bigger, amplifying
Noise signal is also amplified while effective photoelectric signal, so that the noise of photodetection signal is relatively low, bandwidth decline.
Therefore, it is necessary to reasonably be distributed the gain of front stage amplifying circuit.Traditional differential amplifier circuit is often due to photodiode
Impedance it is big, cause the load capacity of photodetector inadequate.In addition, in actual use, to the ruler of photodetector
Very little also restricted requirement.
Summary of the invention
For above-mentioned technical problem present in traditional detector with differential amplification function, disclosed by the invention one
Kind have the miniaturization photo-electricity detector technical problems to be solved of differential amplification function are as follows: provide a kind of high sensitive, Gao Xin
It makes an uproar ratio, miniaturization, high load capacity, the photodetector with differential amplification function, it being capable of the big electricity of equiblibrium mass distribution front and back stages
The gain on road.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, peripheral equipment are to be measured sharp
The emergent light of light device, laser is incident in the miniaturization photo-electricity detector with differential amplification function as object to be measured, this
The nearly 320-1100nm of corresponding wave band of photodetector in invention, can cover ultraviolet light, visible light, near infrared band.
A kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, mainly by photoelectric detection module
It is formed with differential amplifier circuit module two parts.
The photoelectric detection module of front end is mainly responsible for the outgoing optical signal for collecting testing laser device.The photoelectric detection module
Including two sets of photodiodes and two sets of protection shells.Wherein, first set photodiode and protection shell include first two-tube
Footlights electric diode, the first detector protect shell, the first SMA signal line terminals.Second set of photodiode and protection shell
Shell, the 2nd SMA signal line terminals are protected including the second double tube-legs photodiode, the second detector.
The differential amplifier circuit module of rear end can the detectable signal to two sets of photodiodes carry out differential amplification processing.
The differential amplifier circuit module is mainly by first order amplifying circuit, two-way voltage follower, second level differential amplifier circuit group
At.It include two parallel amplifying circuit branches in first order amplifying circuit, input is visited from front end photoelectric detection module
The photoelectric current measured, two amplifying circuits are exported after amplifying respectively to two-way photo-signal and are done at subsequent differential amplification
Reason.
According to experiment demand, the preferred 26dB of the gain of first order amplifying circuit, two amplifications are electric in first order amplifying circuit
The gain design on road is identical.The differential amplifier circuit module of rear end includes the first operational amplifier, second operational amplifier, third
Arithmetic unit amplifier, four-operational amplifier, the 5th operational amplifier, first resistor, second resistance, 3rd resistor, the 4th electricity
Resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 3rd port SMA, the 4th SMA
Port, the 5th port SMA, the 6th port SMA, the 7th port SMA, the first double end row needle, the second double end row needle, the three or three row
Needle, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, the 7th capacitor, the 8th capacitor,
Nine capacitors, the tenth capacitor, the 11st capacitor, the 12nd capacitor.The first order amplifying circuit include the first operational amplifier,
Second operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the second capacitor, third electricity
Appearance, the 8th capacitor, the 9th capacitor, the 3rd port SMA, the 4th port SMA, the first double end row needle, the second double end arrange needle.Described
Two-way voltage follower include four-operational amplifier, the 5th operational amplifier, the 5th capacitor, the 6th capacitor, the 11st capacitor,
12nd capacitor.The second level differential amplifier circuit includes the 7th resistance, the 8th resistance, third arithmetic unit amplifier, the
Ten resistance, the 4th capacitor, the tenth capacitor, the 7th port SMA.
The photoelectric detection module and differential amplifier circuit mould of the above-mentioned miniaturization photo-electricity detector with differential amplification function
Block two parts connection type is as follows.
The connection type of first set photoelectric detection module is that the anode of the first double tube-legs photodiode connects the 3rd end SMA
The signal input part of mouth, the cathode of the first double tube-legs photodiode connect the shielded layer of the 3rd port SMA.Second set of photodetection
Module is identical as the connection type of first set photoelectric detection module.Photodiode incudes the output intensity of peripheral laser, will
Optical signal is converted to current signal and exports to differential amplifier circuit module.
The connection type of differential amplifier circuit module is presented as first order amplifying circuit, two-way voltage follower, the second level
The specific connection type of differential amplifier circuit.The connection type of the first branch is in first order amplifying circuit, a left side for first resistor
The signal input part of the 3rd port SMA is terminated, the right end of first resistor connects the inverting input terminal of the first operational amplifier, third
The shielding layer grounding of the port SMA.The left end of second resistance is grounded, and the positive that the right end of second resistance connects the first operational amplifier is defeated
Enter end.The left end of 3rd resistor connects the right end of first resistor, and the right end of 3rd resistor connects the signal output of the first operational amplifier
End.The signal output end of first operational amplifier connects the normal phase input end of four-operational amplifier in voltage follower, meanwhile, the
The signal output end of one operational amplifier connects the left end of the first double end row's needle.
The connection type of second branch is in first order amplifying circuit, and the left end of the 4th resistance connects the letter of the 4th port SMA
Number input terminal, the right end of the 4th resistance connect the inverting input terminal of second operational amplifier, the shielding layer grounding of the 4th port SMA.
The left end of 5th resistance is grounded, and the right end of the 5th resistance connects the normal phase input end of second operational amplifier.The left end of 6th resistance
Connect the right end of the 4th resistance, the signal output end of the right end second operational amplifier of the 6th resistance.The letter of second operational amplifier
Number output termination the 5th operational amplifier normal phase input end, meanwhile, the signal output end of second operational amplifier connects second pair
The left end of head row's needle.
Connection type with first branch output voltage follower in first order amplifying circuit is, four-operational amplifier
Anti-phase input terminates the signal output end of four-operational amplifier, meanwhile, the signal output end of four-operational amplifier connects the 5th
The signal input part of the port SMA, the shielding layer grounding of the 5th port SMA.With second branch output electricity in first order amplifying circuit
The connection type of pressure follower is that the anti-phase input of the 5th operational amplifier terminates the signal output end of the 5th operational amplifier,
Meanwhile the 5th the signal output end of operational amplifier connect the signal input part of the 6th port SMA, the shielded layer of the 6th port SMA
Ground connection.
The connection type of second level differential amplifier circuit is that the left end of the 7th resistance connects the right end of the first double end row's needle, the
The right end of seven resistance connects the inverting input terminal of operational amplifier, and the left end of the 8th resistance connects the right end of the second double end row's needle, and the 8th
The right end of resistance connects the normal phase input end of operational amplifier, and the left end of the 9th resistance connects the normal phase input end of operational amplifier, the
The right end of nine resistance is grounded.The left end of tenth resistance connects the inverting input terminal of operational amplifier, and the right end of the tenth resistance connects operation
The signal output end of amplifier, the signal output end of operational amplifier connect the signal input part of the 7th port SMA, the 7th end SMA
The shielding layer grounding of mouth.First operational amplifier~the 5th operational amplifier positive polarity connects a left side for the three or three row's needle
(on) rectify power supply VCC, voltage cathode connect the three or three row needle the right side (under) end negative supply VEE.The left end of first capacitor connects just
Power supply VCC, the right end ground connection of first capacitor.The left end of second capacitor connects the positive electricity source interface of the first operational amplifier, the second capacitor
Right end ground connection.The left end of 8th capacitor connects the negative electricity source interface of the first operational amplifier, the right end ground connection of the 8th capacitor.Third
The left end of capacitor connects the positive electricity source interface of second operational amplifier, the right end ground connection of third capacitor.The left end of 8th capacitor connects
The negative electricity source interface of two operational amplifiers, the right end ground connection of the 8th capacitor.The left end of 4th capacitor connects the positive electricity of operational amplifier
Source interface, the right end ground connection of the 4th capacitor.The left end of 9th capacitor connects the negative electricity source interface of operational amplifier, the right side of the 9th capacitor
End ground connection.The left end of 5th capacitor connects the positive electricity source interface of four-operational amplifier, the right end ground connection of the 5th capacitor.11st electricity
The left end of appearance connects the negative electricity source interface of four-operational amplifier, the right end ground connection of the 11st capacitor.The left end of 6th capacitor connects
The positive electricity source interface of five operational amplifiers, the right end ground connection of the 6th capacitor.The left end of 12nd capacitor connects the 5th operational amplifier
Negative electricity source interface, the 12nd capacitor right end ground connection.3rd port SMA~the 7th port SMA and first capacitor~12nd
The ground terminal of capacitor meets the middle-end ground wire GND of the three or three row's needle.
The differential amplifier circuit module increases by first pair between first order amplifying circuit and second level amplifying circuit
Head row's needle and the second double end arrange needle, realize the stand-alone mode debugging and the of first order amplifying circuit and second level differential amplifier circuit
United mode debugging after level-one amplifying circuit and the cascade of second level differential amplifier circuit.
A kind of working method of miniaturization photo-electricity detector with differential amplification function disclosed by the invention are as follows:
Photodiode in photoelectric detection module incudes the emergent light of peripheral laser, and optical signal is converted to electric current letter
Number output to differential amplification function circuit module.The output current signal of two-way photoelectric tube is as differential amplifier circuit mould
Current signal is carried out two-stage amplification by the input signal of block, the circuit board with differential amplifier circuit function, and to two-way electric current
Signal differential processing, exports the differential amplification electric signal with high voltage amplitude.A kind of miniaturization with differential amplification function
Photodetector can be realized the two ways of optical signals photoelectric conversion to low-power and carry out the function of differential amplification to current signal.
The utility model has the advantages that
1, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, the photodetection mould
Block is realized using photodiode light intensity signal being converted into current signal, the nearly 320- of the spectral response range of photodiode
The corresponding wave band of 1100nm, detector cover ultraviolet light, visible light, near infrared band, Raman optical band can be covered, in Raman
Light 780nm wave band, the radiosusceptibility of photodiode is 0.52A/W, sensitive to low-power laser, be can reduce to laser function
The demand of rate.
2, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, the differential amplification electricity
Road module, amplifying circuit are cascaded using two-stage calculation amplifier, and by circuit gain, equiblibrium mass distribution, the first order are straight in two-stage circuit
The preferred 26dB of flow enhancement, the preferred 28dB of second level DC current gain, two-stage amplifying circuit realize 54dB gain close to direct current signal
Amplification, the design of diversity gain had not only avoided excessively amplifying noise, but also can reduce the requirement to exploring laser light power, facilitated pair
The monitoring of spectral signal.
3, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, the differential amplification electricity
Road module, the signal output end of photoelectric detection module and the signal input part of differential amplifier circuit use the port SMA and coaxial line
The transmission of cable completion current signal.Light intensity signal is converted to current signal and passes through the port SMA and coaxial cable by photodiode
Current signal is transmitted to differential amplifier circuit, two input signal output ports of differential amplifier circuit plate also use the port SMA
Transmit current signal.The port SMA and being used cooperatively for coaxial cable enhance the anti-interference ability of detector, improve detectable signal
Signal-to-noise ratio.
4, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, the differential amplification electricity
Road module is amplified and is designed using second level the function that circuit realizes difference in the amplifying circuit of the second level, can reduce circuit elements
Number of packages amount, so that circuit is simple.It is designed using double-layer circuit board, rational deployment wiring reduces the size of circuit board, has difference
Enlarging function circuit is realized on the circuit board of the nearly 5cm square of a block size, so that photodetector minimizes.
5, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, the differential amplification electricity
Road module adds voltage follower in the signal output end of first order operational amplifier, when circuit board first order amplifying circuit and
When the cascade operation of second level amplifying circuit, the output signal and differential amplification of two-way first order operational amplifier can be observed simultaneously
Signal, the drawbacks of overcoming the mutual crosstalk of front and back stages signal, in addition, adding voltage follower can be improved the band of entire detector
Loading capability.
6, a kind of miniaturization photo-electricity detector with differential amplification function disclosed by the invention, using with the port SMA
Photoelectric detection module and simple structure, second level differential amplifier circuit structure with voltage follower, make light of the invention
Electric explorer has the advantages that the gain of equiblibrium mass distribution front and back stages amplifying circuit, low cost, has excellent service performance.
Detailed description of the invention
Fig. 1 is the photodetector schematic diagram with differential amplification function of the invention.
Fig. 2 is the photodetector module distribution schematic diagram with differential amplification function of the invention.
Fig. 3 is the schematic diagram of photoelectric detection module shell of the invention.
Specific embodiment
Objects and advantages in order to better illustrate the present invention with reference to the accompanying drawing do further summary of the invention with example
Explanation.
Embodiment 1:
As depicted in figs. 1 and 2, a kind of miniaturization photo-electricity detector with differential amplification function disclosed in the present embodiment,
Including photoelectric detection module and differential amplifier circuit module two parts.
The photoelectric detection module of front end is mainly responsible for the outgoing optical signal for collecting testing laser device.The photodetection mould
Block, the photoelectric detection module include two sets of photodiodes and two sets of protection shells.Wherein, first set photodiode and guarantor
Shield shell includes: the first double tube-legs photodiode 1-a, the protection of the first detector shell 2-a, the first SMA signal line terminals 3-
a.Second set of photodiode and protection shell include: the second double tube-legs photodiode 1-b, the second detector protection shell 2-
B, the 2nd SMA signal line terminals 3-b.
The differential amplifier circuit module of rear end can the detectable signal to two sets of photodiodes carry out differential amplification processing.
The differential amplifier circuit module is mainly by first order amplifying circuit, two-way voltage follower, second level differential amplifier circuit group
At.It include two parallel amplifying circuit branches in first order amplifying circuit, input is visited from front end photoelectric detection module
The photoelectric current measured, two amplifying circuits are exported after amplifying respectively to two-way photo-signal and are done at subsequent differential amplification
Reason.According to experiment demand, the preferred 26dB of the gain of first order amplifying circuit, the increasing of two amplifying circuits in first order amplifying circuit
Benefit design is identical.The differential amplifier circuit module of rear end includes the first operational amplifier 4, second operational amplifier 5, third operation
Device amplifier 6, four-operational amplifier 7, the 5th operational amplifier 8, first resistor 9, second resistance 10,3rd resistor 11,
Four resistance 12, the 5th resistance 13, the 6th resistance 14, the 7th resistance 15, the 8th resistance 16, the 9th resistance 17, the tenth resistance 18,
Three ports SMA 19, the 4th port SMA 20, the 5th port SMA 21, the 6th port SMA 22, the 7th port SMA 23, the first double end
Arrange needle 24, the second double end row 25, the 3rd 3 row's needles 26 of needle, first capacitor 27, the second capacitor 28, the 29, the 4th electricity of third capacitor
Hold the 30, the 5th capacitor 31, the 6th capacitor 32, the 7th capacitor 33, the 8th capacitor 34, the 9th capacitor 35, the tenth capacitor the 36, the 11st
Capacitor 37, the 12nd capacitor 38.Wherein, the member of first order amplifying circuit, two-way voltage follower, second level differential amplifier circuit
Part group prejudice explanatory diagram 1.The first order amplifying circuit includes the first operational amplifier 4, second operational amplifier 5, first
Resistance 9, second resistance 10,3rd resistor 11, the 4th resistance 12, the 5th resistance 13, the second capacitor 28, third capacitor the 29, the 8th
Capacitor 34, the 9th capacitor 35, the 3rd port SMA 19, the 4th port SMA 20, the first double end row needle 24, the second double end arrange needle 25.
The two-way voltage follower includes four-operational amplifier 7, the 5th operational amplifier 8, the 5th capacitor 31, the 6th capacitor
32, the 11st capacitor 37, the 12nd capacitor 38.The second level differential amplifier circuit includes the 7th resistance 15, the 8th resistance
16, third arithmetic unit amplifier 6, the tenth resistance 18, the 4th capacitor 30, the tenth capacitor 36, the 7th port SMA 23.
The photoelectric detection module and differential amplifier circuit mould of the above-mentioned miniaturization photo-electricity detector with differential amplification function
Block two parts connection type is as follows.
The connection type of first set photoelectric detection module is that the anode of the first double tube-legs photodiode 1-a meets the 3rd SMA
The cathode of the signal input part of port 19, the first double tube-legs photodiode 1-a connects the shielded layer of the 3rd port SMA 19.Second
It is identical as the connection type of first set photoelectric detection module to cover photoelectric detection module.Photodiode incudes going out for peripheral laser
Light intensity is penetrated, optical signal is converted to current signal and is exported to the circuit board with differential amplification function.
The connection type of differential amplifier circuit module is presented as first order amplifying circuit, two-way voltage follower, the second level
The specific connection type of differential amplifier circuit.The connection type of the first branch is in first order amplifying circuit, a left side for first resistor 9
The signal input part of the 3rd port SMA 19 is terminated, the right end of first resistor 9 connects the inverting input terminal of the first operational amplifier 4, the
The shielding layer grounding of three ports SMA 19.The left end of second resistance 10 is grounded, and the right end of second resistance 10 connects the first operational amplifier
4 normal phase input end.The left end of 3rd resistor 11 connects the right end of first resistor 9, and the right end of 3rd resistor 11 connects the first operation and puts
The signal output end of big device 4.The signal output end of first operational amplifier 4 connects four-operational amplifier 7 in voltage follower
Normal phase input end, meanwhile, the signal output end of the first operational amplifier 4 connects the left end of the first double end row's needle 24.
The connection type of second branch is in first order amplifying circuit, and the left end of the 4th resistance 12 connects the 4th port SMA 20
Signal input part, the right end of the 4th resistance 12 connects the inverting input terminal of second operational amplifier 5, the screen of the 4th port SMA 20
Cover layer ground connection.The left end of 5th resistance 13 is grounded, and the right end of the 5th resistance 13 connects the normal phase input end of second operational amplifier 5.
The left end of 6th resistance 14 connects the right end of the 4th resistance 12, the signal output of the right end second operational amplifier 5 of the 6th resistance 14
End.The signal output end of second operational amplifier 5 connects the normal phase input end of the 5th operational amplifier 8, meanwhile, the second operation amplifier
The signal output end of device 5 connects the left end of the second double end row's needle 25.
Connection type with first branch output voltage follower in first order amplifying circuit is four-operational amplifier 7
Anti-phase input termination four-operational amplifier 7 signal output end, meanwhile, the signal output end of four-operational amplifier 7 connects
The signal input part of 5th port SMA 21, the shielding layer grounding of the 5th port SMA 21.With second in first order amplifying circuit
The connection type of road output voltage follower is that the anti-phase input of the 5th operational amplifier 8 terminates the letter of the 5th operational amplifier 8
Number output end, meanwhile, the signal output end of the 5th operational amplifier 8 meets the signal input part of the 6th port SMA 22, the 6th SMA
The shielding layer grounding of port 22.
The connection type of second level differential amplifier circuit is that the left end of the 7th resistance 15 connects the right side of the first double end row's needle 24
End, the right end of the 7th resistance 15 connect the inverting input terminal of operational amplifier 6, and the left end of the 8th resistance 16 connects the second double end row's needle 25
Right end, the right end of the 8th resistance 16 connects the normal phase input end of operational amplifier 6, and the left end of the 9th resistance 17 connects operational amplifier
Normal phase input end, the 9th resistance 17 right end ground connection.The left end of tenth resistance 18 connects the inverting input terminal of operational amplifier 6,
The right end of tenth resistance 18 connects the signal output end of operational amplifier 6, and the signal output end of operational amplifier 6 connects the 7th end SMA
The signal input part of mouth 23, the shielding layer grounding of the 7th port SMA 23.The 4~the 5th operational amplifier 8 of first operational amplifier
Positive polarity connect the three or three row needle 26 a left side (on) rectify power supply VCC, voltage cathode connect the three or three row needle 26 the right side
(under) end negative supply VEE.The left end of first capacitor 27 meets positive supply VCC, the right end ground connection of first capacitor 27.Second capacitor 28
Left end connects the positive electricity source interface of the first operational amplifier 4, the right end ground connection of the second capacitor 28.The left end of 8th capacitor 34 connects first
The negative electricity source interface of operational amplifier 4, the right end ground connection of the 8th capacitor 34.The left end of third capacitor 29 connects second operational amplifier
5 positive electricity source interface, the right end ground connection of third capacitor 29.The left end of 8th capacitor 34 connects the negative supply of second operational amplifier 5
Interface, the right end ground connection of the 8th capacitor 34.The left end of 4th capacitor 30 connects the positive electricity source interface of operational amplifier 6, the 4th capacitor
30 right end ground connection.The left end of 9th capacitor 35 connects the negative electricity source interface of operational amplifier 6, the right end ground connection of the 9th capacitor 35.
The left end of 5th capacitor 31 connects the positive electricity source interface of four-operational amplifier 7, the right end ground connection of the 5th capacitor 31.11st capacitor
37 left end connects the negative electricity source interface of four-operational amplifier 7, the right end ground connection of the 11st capacitor 37.The left end of 6th capacitor 32
Connect the positive electricity source interface of the 5th operational amplifier 8, the right end ground connection of the 6th capacitor 32.The left end of 12nd capacitor 38 connects the 5th fortune
Calculate the negative electricity source interface of amplifier 8, the right end ground connection of the 12nd capacitor 38.3rd the 19~the seven port SMA 23 of the port SMA and
The ground terminal of the 27~the 12nd capacitor 38 of one capacitor meets the middle-end ground wire GND of the three or three row's needle 26.
The signal of whole circuit board, which is output and input, is all made of the port SMA and coaxial cable, can be improved entire photoelectricity and visits
Survey the anti-interference ability of device.Differential amplifier circuit plate uses easy structure, rational deployment wiring, in the circuit of one piece of 5cm square
Differential amplification function is realized on plate.The entire photodetector with differential amplification function has high sensitive, high s/n ratio, height
The excellent performance of load capacity, and have the advantages that low cost, miniaturization.
Above-described specific descriptions have carried out further specifically the purpose of invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, the protection model being not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (3)
1. a kind of miniaturization photo-electricity detector with differential amplification function, peripheral equipment is laser to be measured, laser
Emergent light is incident in the miniaturization photo-electricity detector with differential amplification function as object to be measured；It is characterized by: main
It is made of photoelectric detection module and differential amplifier circuit module two parts；
The photoelectric detection module of front end is mainly responsible for the outgoing optical signal for collecting testing laser device；The photoelectric detection module includes
Two sets of photodiodes and two sets of protection shells；
The differential amplifier circuit module of rear end is used to carry out differential amplification processing to the detectable signal of two sets of photodiodes；It is described
Differential amplifier circuit module is mainly made of first order amplifying circuit, two-way voltage follower, second level differential amplifier circuit；?
It include two parallel amplifying circuit branches in first order amplifying circuit, what input was detected from front end photoelectric detection module
Photoelectric current, subsequent differential amplification processing is done in output after two amplifying circuits respectively amplify two-way photo-signal；
In the photoelectric detection module of the front end, first set photodiode and protection shell include the first double tube-legs photoelectricity two
Pole pipe (1-a), the first detector protect shell (2-a), the first SMA signal line terminals (3-a)；Second set of photodiode and guarantor
Protecting shell includes the second double tube-legs photodiode (1-b), the protection of the second detector shell (2-b), the 2nd SMA signal line terminals
(3-b)；
The differential amplifier circuit module of the rear end includes the first operational amplifier (4), second operational amplifier (5), third
Arithmetic unit amplifier (6), four-operational amplifier (7), the 5th operational amplifier (8), first resistor (9), second resistance (10),
3rd resistor (11), the 4th resistance (12), the 5th resistance (13), the 6th resistance (14), the 7th resistance (15), the 8th resistance
(16), the 9th resistance (17), the tenth resistance (18), the 3rd port SMA (19), the 4th port SMA (20), the 5th port SMA 21,
6th port SMA (22), the 7th port SMA (23), the first double end row needle (24), the second double end row needle (25), the three or three row
Needle (26), first capacitor (27), the second capacitor (28), third capacitor (29), the 4th capacitor (30), the 5th capacitor (31), the 6th
Capacitor (32), the 7th capacitor (33), the 8th capacitor (34), the 9th capacitor (35), the tenth capacitor (36), the 11st capacitor (37),
12nd capacitor (38)；The first order amplifying circuit includes the first operational amplifier (4), second operational amplifier (5), the
One resistance (9), second resistance (10), 3rd resistor (11), the 4th resistance (12), the 5th resistance (13), the second capacitor (28),
Three capacitors (29), the 8th capacitor (34), the 9th capacitor (35), the 3rd port SMA (19), the 4th port SMA (20), the first double end
Arrange needle (24), the second double end row needle (25)；The two-way voltage follower includes four-operational amplifier (7), the 5th operation
Amplifier (8), the 5th capacitor (31), the 6th capacitor (32), the 11st capacitor (37), the 12nd capacitor (38), the 5th port SMA
21, the 6th port SMA (22)；The second level differential amplifier circuit includes the 7th resistance (15), the 8th resistance (16), third
Arithmetic unit amplifier (6), the tenth resistance (18), the 4th capacitor (30), the tenth capacitor (36), the 7th port SMA (23)；
The connection type of first set photoelectric detection module is that the anode of the first double tube-legs photodiode (1-a) connects the 3rd end SMA
The signal input part of mouth (19), the cathode of the first double tube-legs photodiode (1-a) connect the shielded layer of the 3rd port SMA (19)；
Second set of photoelectric detection module is identical as the connection type of first set photoelectric detection module；Photodiode incudes peripheral laser
Output intensity, optical signal is converted to current signal and is exported to differential amplifier circuit module；
The connection type of differential amplifier circuit module is presented as first order amplifying circuit, two-way voltage follower, second level difference
The specific connection type of amplifying circuit；The connection type of the first branch is in first order amplifying circuit, the left end of first resistor (9)
The signal input part of the 3rd port SMA (19) is connect, the right end of first resistor (9) connects the anti-phase input of the first operational amplifier (4)
End, the shielding layer grounding of the 3rd port SMA (19)；The left end of second resistance (10) is grounded, and the right end of second resistance (10) connects the
The normal phase input end of one operational amplifier (4)；The left end of 3rd resistor (11) connects the right end of first resistor (9), 3rd resistor
(11) right end connects the signal output end of the first operational amplifier (4)；The signal output end of first operational amplifier (4) connects voltage
The normal phase input end of four-operational amplifier (7) in follower, meanwhile, the signal output end of the first operational amplifier (4) connects
One double end arranges the left end of needle (24)；
The connection type of second branch is in first order amplifying circuit, and the left end of the 4th resistance (12) connects the 4th port SMA (20)
Signal input part, the right end of the 4th resistance (12) connects the inverting input terminal of second operational amplifier (5), the 4th port SMA
(20) shielding layer grounding；The left end of 5th resistance (13) is grounded, and the right end of the 5th resistance (13) connects second operational amplifier (5)
Normal phase input end；The left end of 6th resistance (14) connects the right end of the 4th resistance (12), and the right end second of the 6th resistance (14) is transported
Calculate the signal output end of amplifier (5)；The signal output end of second operational amplifier (5) is connecing the 5th operational amplifier (8) just
Phase input terminal, meanwhile, the signal output end of second operational amplifier 5 connects the left end of the second double end row needle (25)；
Connection type with first branch output voltage follower in first order amplifying circuit is, four-operational amplifier (7)
Anti-phase input terminates the signal output end of four-operational amplifier (7), meanwhile, the signal output end of four-operational amplifier (7)
Connect the signal input part of the 5th port SMA (21), the shielding layer grounding of the 5th port SMA (21)；In first order amplifying circuit
The connection type of second branch output voltage follower is that the anti-phase input of the 5th operational amplifier (8) terminates the 5th operation and puts
The signal output end of big device (8), meanwhile, the signal output end of the 5th operational amplifier (8) connects the signal of the 6th port SMA (22)
Input terminal, the shielding layer grounding of the 6th port SMA (22)；
The connection type of second level differential amplifier circuit is that the left end of the 7th resistance (15) connects the right end of the first double end row's needle 24,
The right end of 7th resistance (15) connects the inverting input terminal of operational amplifier (6), and the left end of the 8th resistance (16) meets the second double end row
The right end of needle (25), the right end of the 8th resistance (16) connect the normal phase input end of operational amplifier (6), the left end of the 9th resistance (17)
Connect the normal phase input end of operational amplifier, the right end ground connection of the 9th resistance (17)；The left end of tenth resistance (18) connects operation amplifier
The inverting input terminal of device (6), the right end of the tenth resistance (18) connect the signal output end of operational amplifier (6), operational amplifier (6)
Signal output end connect the signal input part of the 7th port SMA (23), the shielding layer grounding of the 7th port SMA (23)；First fortune
Calculate amplifier (4)~the 5th operational amplifier (8) positive polarity connect the three or three row needle (26) a left side (on) rectify power supply
VCC, voltage cathode connect the three or three row needle (26) the right side (under) end negative supply VEE；The left end of first capacitor (27) connects positive supply
VCC, the right end ground connection of first capacitor (27)；The left end of second capacitor (28) connects the positive electricity source interface of the first operational amplifier (4),
The right end of second capacitor (28) is grounded；The left end of 8th capacitor (34) connects the negative electricity source interface of the first operational amplifier (4), and the 8th
The right end of capacitor (34) is grounded；The left end of third capacitor (29) connects the positive electricity source interface of second operational amplifier (5), third capacitor
(29) right end ground connection；The left end of 8th capacitor (34) connects the negative electricity source interface of second operational amplifier 5, the 8th capacitor (34)
Right end ground connection；The left end of 4th capacitor (30) connects the positive electricity source interface of operational amplifier (6), and the right end of the 4th capacitor (30) connects
Ground；The left end of 9th capacitor (35) connects the negative electricity source interface of operational amplifier (6), the right end ground connection of the 9th capacitor (35)；5th
The left end of capacitor (31) connects the positive electricity source interface of four-operational amplifier (7), the right end ground connection of the 5th capacitor (31)；11st electricity
The left end for holding (37) connects the negative electricity source interface of four-operational amplifier (7), the right end ground connection of the 11st capacitor (37)；6th capacitor
(32) left end connects the positive electricity source interface of the 5th operational amplifier (8), the right end ground connection of the 6th capacitor (32)；12nd capacitor
(38) left end connects the negative electricity source interface of the 5th operational amplifier (8), the right end ground connection of the 12nd capacitor (38)；3rd end SMA
The ground terminal of the mouth port SMA of (19)~7th (23) and first capacitor (27)~the 12nd capacitor (38) connects the three or three row's needle
(26) middle-end ground wire GND.
2. a kind of miniaturization photo-electricity detector with differential amplification function as described in claim 1, it is characterised in that: according to
26dB is selected in experiment demand, the gain of first order amplifying circuit, the gain design phase of two amplifying circuits in first order amplifying circuit
Together.
3. a kind of miniaturization photo-electricity detector with differential amplification function as claimed in claim 2, it is characterised in that: photoelectricity
The nearly 320-1100nm of corresponding wave band of detector covers ultraviolet light, visible light, near infrared band.
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| CN107817097B (en) * | 2017-12-05 | 2024-05-31 | 深圳市杰普特光电股份有限公司 | Laser light detection circuit |
| CN109387764A (en) * | 2018-12-03 | 2019-02-26 | 上海仪电分析仪器有限公司 | A kind of highly sensitive high jamproof photodiode detector |
| CN110768722A (en) * | 2019-11-20 | 2020-02-07 | 西北核技术研究院 | Radiation Detection Broadband Analog Optical Fiber Transmission System |
| CN114578885B (en) * | 2022-03-08 | 2023-09-05 | 中国科学院合肥物质科学研究院 | Integrated photoelectric detector with multiple operation outputs |
| CN117741624B (en) * | 2024-02-21 | 2024-05-24 | 成都智明达电子股份有限公司 | Low-noise laser echo front-end receiving circuit |
| CN118730294B (en) * | 2024-06-06 | 2025-05-02 | 南京航空航天大学 | A UV power meter based on n-ZnO:Ga/p-GaN heterojunction photodetector |
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| CN106525325A (en) * | 2016-12-16 | 2017-03-22 | 山东金洲科瑞节能科技有限公司 | Pressure measurement conversion circuit with adjustable differential signal gain |
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| TWM248111U (en) * | 2003-11-14 | 2004-10-21 | Quarton Inc | Laser line receiver |
| CN102638734A (en) * | 2012-03-12 | 2012-08-15 | 东南大学 | Optical receiver front-end circuit in high-speed burst mode |
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