CN203482170U - Ultrafast pulse generating circuit based on superspeed voltage comparator - Google Patents
Ultrafast pulse generating circuit based on superspeed voltage comparator Download PDFInfo
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- CN203482170U CN203482170U CN201320602639.8U CN201320602639U CN203482170U CN 203482170 U CN203482170 U CN 203482170U CN 201320602639 U CN201320602639 U CN 201320602639U CN 203482170 U CN203482170 U CN 203482170U
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Abstract
The utility model relates to an ultrafast pulse generating circuit based on a superspeed voltage comparator. The ultrafast pulse generating circuit comprises an FPGA waveform controller used for generating a first control signal and a second control signal, a signal conversion module used for converting the first control signal and the second control signal from the FPGA waveform controller to a first pulse signal and a second pulse signal, and the superspeed voltage comparator used for comparing amplitudes of the first pulse signal and the second pulse signal and outputting an ultrafast pulse signal, and the first pulse signal and the second pulse signal share the same phase and different amplitudes with the first control signal and the second control signal. According to the ultrafast pulse generating circuit based on the superspeed voltage comparator, the rising edge of 50ps and the pulse width of 100ps can be obtained, the pulse signal with ideal power and waveform, high speed and low jitter can be provided, and the ultrafast pulse generating circuit is also advantaged by low power, small size, light weight, and simple structure.
Description
Technical field
The utility model relates to a kind of pulse-generating circuit, and particularly a kind of ultrafast pulse based on ultrahigh speed voltage comparator produces circuit.
Background technology
The performance of ultrafast pulse is relevant with the high speed device using in circuit, and device in the past can produce the high-speed pulse that rising edge is nanosecond.Device for generation of this high-speed pulse mainly contains: the devices such as tunnel diode, step recovery diode, avalanche transistor, bipolar transistor, photoconductive switch.Utilize tunnel diode, step recovery diode can produce ultra-narrow pulse, but the pulse amplitude producing is generally hundreds of millivolt, the rising edge of pulse is generally hundreds of psec; Avalanche transistor based on Marx circuit can produce the pulse of nanosecond, and the pulse amplitude of generation is tens to several hectovolts, but can trigger rate the low and supply voltage of having relatively high expectations, the rising edge of pulse is generally nanosecond; Photoconductive switch based on gap can produce kilovolt an above pulse, but the pulse repetition frequency producing is too low, and needs during work hundreds of to the supply voltage of several kilovolts, bulky, is unfavorable for the designing requirement of miniaturization; The pulse performance that bipolar transistor produces is good, and can trigger rate high, amplitude can reach tens volts, can meet the specification requirement of general sending and receiving system, but the rising edge of the pulse producing is generally nanosecond.Utilize traditional method for generating pulse to be difficult to realize the pulse signal that rising edge is less than 50ps.
Utility model content
For the deficiencies in the prior art, the utility model provides a kind of ultrafast pulse based on ultrahigh speed voltage comparator to produce circuit, is beneficial to realize the generation on 50ps ultrafast pulse edge, solves the problem that traditional circuit is difficult to the ultrafast pulse generation of realization.
The technical problem existing for solving prior art, the utility model provides a kind of ultrafast pulse based on ultrahigh speed voltage comparator to produce circuit, it is characterized in that: this circuit comprises
FPGA waveshape monitor, for generation of the first control signal and the second control signal,
Signal conversion module, for the first control signal from described FPGA waveshape monitor and the second control signal being converted to the first pulse signal and the second pulse signal that phase place same magnitude is different, and
Ultrahigh speed voltage comparator, for described the first pulse signal and the second pulse signal are carried out to Amplitude Ratio, and exports ultrafast pulse signal.
Preferably, described signal conversion module comprises the first branch road and the second branch road, and described the first branch road comprises the first digital-to-analog converter and the first amplifier, and the output of described the first digital to analog converter is connected with the first amplifier; Described the second branch road comprises the second digital-to-analog converter and the second amplifier, and the output of described the second digital to analog converter is connected with the second amplifier.
Preferably, described signal conversion module is also included in the first filter connecting between the first digital-to-analog converter and the first amplifier, the second filter connecting between the second digital-to-analog converter and the second amplifier.
Preferably, described the first branch road according to described the first control signal output dc voltage the threshold voltage V as ultrahigh speed voltage comparator
h; Described the second branch road is the input signal as ultrahigh speed voltage comparator according to described the second pulse signal that control signal output frequency is adjustable, amplitude is controlled.
Preferably, described ultrafast pulse produces circuit and adopts multiple sliding cover.
Preferably, the input and output impedance of this circuit is 50 ohm.
Preferably, the input/output interface of this circuit adopts 2.92mmSMA.
Preferably, described ultrafast pulse produces the ultrafast pulse signal that circuit output rising edge is less than 50ps.
The beneficial effects of the utility model: it is that 50ps, pulsewidth are approximately 100ps that the utility model can obtain rising edge based on ultrahigh speed voltage comparator, and the pulse signal with the high speed low jitter of ideal power, ideal waveform, this circuit also has the feature that power is low, volume is little, lightweight and simple in structure simultaneously.
Accompanying drawing explanation
Fig. 1 illustrates the schematic block diagram that a kind of ultrafast pulse based on ultrahigh speed voltage comparator produces circuit.
In figure 1, FPGA waveshape monitor, the 2, first digital-to-analog converter, the 3, second digital-to-analog converter, the 4, first filter, the 5, second filter, the 6, first amplifier, the 7, second amplifier, 8, ultrahigh speed voltage comparator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Ultrafast pulse produces a circuit, and this circuit comprises FPGA waveshape monitor 1, for generation of the first control signal and the second control signal, signal conversion module, for the first control signal from described FPGA waveshape monitor 1 and the second control signal are converted to the first pulse signal and the second pulse signal that phase place same magnitude is different, described signal conversion module comprises the first branch road and the second branch road, described the first branch road comprises the first digital-to-analog converter 2 and the first amplifier 6, the output of described the first digital to analog converter 2 is connected with the first amplifier 6, described the second branch road comprises the second digital-to-analog converter 3 and the second amplifier 7, the output of described the second digital to analog converter 3 is connected with the second amplifier 7, described signal conversion module is also included in the first filter 4 connecting between the first digital-to-analog converter 2 and the first amplifier 6, the second filter 5 connecting between the second digital-to-analog converter 3 and the second amplifier 7, ultrahigh speed voltage comparator 8, for described the first pulse signal and the second pulse signal are carried out to Amplitude Ratio, and exports the pulse signal that rising edge is less than 50ps, and described circuit adopts multiple sliding cover, and the input/output interface of described circuit adopts 2.92mmSMA.
The utility model operation principle: FPGA waveshape monitor 1 output two path control signal, control respectively the first digital-to-analog converter 2 and the second digital-to-analog converter 3 on two branch roads, make the first digital-to-analog converter 2 and the second pulse signal that digital-to-analog converter 3 output phases are synchronous, amplitude is different on two branch roads.Owing to being subject to other noise impact, the shake of digital-to-analog converter 2,3 output signals is larger, and amplitude and frequency are unstable, need to carry out filtering to this signal, eliminates spurious signal.Filter 4,5 Main Functions are that filtering is spuious, improve the quality of digital-to-analog converter output signal, reduce the amplitude fluctuation of pulse signal on two branch roads.Because the signal amplitude of digital-to-analog converter output is all smaller, and two tributary signal amplitude difference also less, can not drive the normal operation of ultrahigh speed voltage comparator, therefore on two branch roads, signal amplitude needs to amplify, and makes voltage on two branch roads and the poor enough driving ultrahigh speed voltage comparator normal operations of signal voltage of two branch roads.Amplifier 6,7 is mainly used in signal voltage to be amplified to the size needing; When the signal voltage of two branch roads outputs is poor while being for example greater than 400mV, ultrahigh speed voltage comparator 8 output high level; When the signal voltage of two branch roads outputs is poor while being for example less than 400mV, ultrahigh speed voltage comparator output low level; Ultrahigh speed voltage comparator 8 can produce the quick little Vibrating pulse signal that rising edge is 50ps.
Circuit described in the utility model adopts multiple sliding cover, and each power planes is relatively independent, reduces to greatest extent induction reactance in loop; Secondly, this circuit structure should guarantee that input and output impedance is the impedance matching of 50 ohm, and input/output interface is 2.92mmSMA, reduces the shake of input/output signal.Circuit board adopts 0.254mm Rogers 4350B sheet material.Before circuit operation, need to regulate ultrahigh speed voltage comparator 8, the first digital-to-analog converter 2 and the second digital-to-analog converter 3, first, by FPGA, set the first digital-to-analog converter 2 output dc voltages.After this direct voltage amplifies by the first amplifier 6 as ultrahigh speed voltage comparator 8 threshold voltage V
hthe first input end of input ultrahigh speed voltage comparator 8; Secondly, by FPGA, control the second pulse signal that digital-to-analog converter 3 output frequencies are adjustable, amplitude is controlled.This pulse signal is inputted the second input of ultrahigh speed voltage comparator 8 after the second amplifier 7 amplifies as input signal.If the input signal of the second input approaches the threshold level+V of ultrahigh speed voltage comparator 8 from low state
h, surpass+V of the voltage of simultaneous input pulse signal
h/ 2 o'clock, ultrahigh speed voltage comparator 8 was exported a rising signals from low to high; When incoming signal level is stablized when constant, 8 outputs of ultrahigh speed voltage comparator retain a high state.If input signal is transformed to low state from high state, the voltage of simultaneous input pulse signal is less than V
h/ 2 o'clock, 8 one of the output of ultrahigh speed voltage comparator are low dropping signal from hypermutation, when incoming signal level is stablized when constant, 8 outputs of ultrahigh speed voltage comparator retain a low state, until input signal approaches ultrahigh speed voltage comparator 8 threshold levels+V from low state
h, the next period of change of ultrahigh speed voltage comparator 8 output.Use this working method, reduce the impact that 0 level signal paired pulses produces circuit output pulse signal, greatly reduce the shake of the pulse signal that pulse-generating circuit exports.
Based on above-mentioned technical scheme described in the utility model, can obtain rising edge is that 50ps, pulsewidth are approximately 100ps, and the pulse signal with the high speed low jitter of ideal power, ideal waveform, this circuit also has the feature that power is low, volume is little, lightweight and simple in structure simultaneously.The utility model cocoa is widely used in the calibration of transient response and the calibration of oscilloscope rising edge of broadband device.Simultaneously also can be for design, imaging of medical and the diagnosis of automatic test equipment, thresholding detection, high speed triggering circuit, high-speed clock signal generation etc.
Can be understood as, the utility model is described by some embodiment, and those skilled in the art, in the situation that not departing from spirit and scope of the present utility model, can carry out various changes or equivalence replacement to these features and embodiment.In addition, under instruction of the present utility model, can modify to adapt to concrete situation and material and can not depart from spirit and scope of the present utility model these features and embodiment.Therefore, the utility model is not subject to the restriction of specific embodiment disclosed herein, and the embodiment within the scope of all the application's of falling into claim belongs to protection range of the present utility model.
Claims (8)
1. the ultrafast pulse based on ultrahigh speed voltage comparator produces a circuit, it is characterized in that: this circuit comprises
FPGA waveshape monitor, for generation of the first control signal and the second control signal,
Signal conversion module, for the first control signal from described FPGA waveshape monitor and the second control signal being converted to the first pulse signal and the second pulse signal that phase place same magnitude is different, and
Ultrahigh speed voltage comparator, for described the first pulse signal and the second pulse signal are carried out to Amplitude Ratio, and exports ultrafast pulse signal.
2. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 1 produces circuit, it is characterized in that:
Described signal conversion module comprises the first branch road and the second branch road, and described the first branch road comprises the first digital-to-analog converter and the first amplifier, and the output of described the first digital to analog converter is connected with the first amplifier;
Described the second branch road comprises the second digital-to-analog converter and the second amplifier, and the output of described the second digital to analog converter is connected with the second amplifier.
3. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 2 produces circuit, it is characterized in that:
Described signal conversion module is also included in the first filter connecting between the first digital-to-analog converter and the first amplifier, the second filter connecting between the second digital-to-analog converter and the second amplifier.
4. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 2 produces circuit, it is characterized in that:
Described the first branch road is the threshold voltage V as ultrahigh speed voltage comparator according to described the first control signal output dc voltage
h;
Described the second branch road is the input signal as ultrahigh speed voltage comparator according to described the second pulse signal that control signal output frequency is adjustable, amplitude is controlled.
5. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 1 produces circuit, it is characterized in that: described ultrafast pulse produces circuit and adopts multiple sliding cover.
6. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 5 produces circuit, and the input and output impedance that it is characterized in that this circuit is 50 ohm.
7. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 5 produces circuit, it is characterized in that: the input/output interface of this circuit adopts 2.92mmSMA.
8. a kind of ultrafast pulse based on ultrahigh speed voltage comparator according to claim 1 produces circuit, it is characterized in that: described ultrafast pulse produces the ultrafast pulse signal that circuit output rising edge is less than 50ps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320602639.8U CN203482170U (en) | 2013-09-27 | 2013-09-27 | Ultrafast pulse generating circuit based on superspeed voltage comparator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320602639.8U CN203482170U (en) | 2013-09-27 | 2013-09-27 | Ultrafast pulse generating circuit based on superspeed voltage comparator |
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| CN203482170U true CN203482170U (en) | 2014-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114371761A (en) * | 2021-12-13 | 2022-04-19 | 中电科思仪科技股份有限公司 | Self-calibration circuit and method for voltage swing of output signal of arbitrary waveform generator |
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2013
- 2013-09-27 CN CN201320602639.8U patent/CN203482170U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114371761A (en) * | 2021-12-13 | 2022-04-19 | 中电科思仪科技股份有限公司 | Self-calibration circuit and method for voltage swing of output signal of arbitrary waveform generator |
| CN114371761B (en) * | 2021-12-13 | 2024-06-04 | 中电科思仪科技股份有限公司 | Self-calibration circuit and method for voltage swing of output signal of arbitrary waveform generator |
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