CN102647161A - Wideband power amplifier for capacitive load - Google Patents
Wideband power amplifier for capacitive load Download PDFInfo
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- CN102647161A CN102647161A CN2012101230923A CN201210123092A CN102647161A CN 102647161 A CN102647161 A CN 102647161A CN 2012101230923 A CN2012101230923 A CN 2012101230923A CN 201210123092 A CN201210123092 A CN 201210123092A CN 102647161 A CN102647161 A CN 102647161A
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- 230000000295 complement effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 4
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Abstract
The invention discloses a wideband power amplifier for a capacitive load, which belongs to the technical field of communication, and comprises a wideband linear power amplifier 201. A wideband feedback circuit 202 is connected between an input end and an output end of the wideband linear power amplifier 201, the output end of the wideband linear power amplifier 201 is connected with a matching circuit 203, an output end of the matching circuit 203 is respectively connected with a matching resistor 205 and a matching resistor 204, the other end of the matching resistor 205 is connected with the capacitive load 206, the other end of the capacitive load 206 and the other end of the matching resistor 204 are respectively connected with an earth wire, the matching resistor 204 and the matching resistor 205 are resistors matched with the capacitive load 206, and input impedance of the capacitive load 206 can be matched with output impedance of the wideband linear power amplifier 201. Compared with the prior art, the wideband power amplifier for the capacitive load has the advantages that operating frequency of the amplifier is improved, use bandwidth of the amplifier is increased, and output voltage and output power are increased.
Description
Technical field
The present invention relates to a kind of power amplifier, relate in particular to a kind of wideband power amplifer of capacitive load, belong to communication technical field.
Background technology
The development of digital communication technology, make power amplifier utilization more and more widely.But general high power amplifier can be because effect of nonlinear produces the spectral re-growth effect; Therefore; On the basis of high power amplifier, must carry out linearization process to it; This just is called linear power amplifier, and it can solve the spectral re-growth and EVM (error vector magnitude) problem of signal preferably.
Linear power amplifier has good stability, characteristics that the linearity is high, is employed aspects such as the for example driving of piezoelectric, spectrometer, photoelectric tube, micro electronmechanical, nanometer engineering in the occasion of a lot of high accuracy, high request.When the driver of power amplifier, during especially for capacitive loads such as excitation piezoelectric ceramic, piezoelectric crystals,, also require power amplifier to have very strong current driving ability in order to obtain the better dynamic performance as piezoelectric.
The driving power amplifier of existing capacitive load is as shown in Figure 1, comprises power amplifier 101, feedback circuit 102, capacitive load 103.Usually as the power amplifier of capacitive load driver, just be asked to be operated in tens KHz, or even a few Hz, bandwidth is also very narrow, however itself and be not suitable for high-frequency work.
Summary of the invention
To the technical problem that exists in the prior art, the object of the present invention is to provide a kind of wideband power amplifer of capacitive load, the driving operating frequency of amplifier of the present invention is 20～100MHz, capacitance is the capacitive load crystal of 5pf.
Technical scheme of the present invention is:
A kind of wideband power amplifer of capacitive load; It is characterized in that comprising a wide-band linearity power amplifier 201; Connect a broadband feedback circuit 202 between said wide-band linearity power amplifier 201 inputs, the output, the output of said wide-band linearity power amplifier 201 is connected with a match circuit 203; Said match circuit 203 outputs are connected with a build-out resistor 205, a build-out resistor 204 respectively; Said build-out resistor 205 other ends are connected with a capacitive load 206; The other end of said capacitive load 206, build-out resistor 204 is connected with ground wire respectively; Wherein, said build-out resistor 204, build-out resistor 205 are and the resistance of capacitive load 206 couplings, the input impedance of capacitive load 206 can be complementary with the output impedance of wide-band linearity power amplifier 201.
Further, said match circuit 203 is the output matching circuit of said wide-band linearity power amplifier 201, is used for the output impedance of wide-band linearity power amplifier 201 is matched optimum matching point.
Further, said optimum matching point is 50 ohm.
Further, said match circuit 203 comprises a plurality of matching capacitance, a plurality of build-out resistor, a coupling inductance; Wherein, signal input part is connected with an end of one second matching capacitance, said coupling inductance respectively through one first matching capacitance; The other end of said coupling inductance is connected with an end of one the 3rd matching capacitance, the 4th matching capacitance respectively; The other end of said the 3rd matching capacitance is connected with an end of one the 5th matching capacitance, first build-out resistor respectively; The other end of said first build-out resistor is connected with an end of one second build-out resistor, one the 3rd build-out resistor respectively; The other end of said second build-out resistor is connected with one the 6th matching capacitance, one end, and said the 6th matching capacitance other end is connected with an end of one the 7th matching capacitance, the 8th matching capacitance respectively, and the other end of said the 8th matching capacitance is as signal output part; The other end of said second matching capacitance, the 4th matching capacitance, the 5th matching capacitance, the 7th matching capacitance, the 3rd build-out resistor is connected with ground wire respectively.
Further, said build-out resistor 205 is a coupling cable, and wherein, the coupling cable length is 1/4th of a transmitted signal wavelengths.
Further, said broadband feedback circuit comprises an inductance 301, an electric capacity 302 and a resistance 303 of series connection successively; Wherein, an end of said inductance 301 is connected with the input of said wide-band linearity power amplifier 201, and an end of said resistance 303 is connected with the output of said wide-band linearity power amplifier 201.
Further, the capacitance value of said electric capacity 302 is 1K Ω～3K Ω.
Further, said wide-band linearity power amplifier 201 is the linear power amplifier of frequency at 20～100MHz.
Further, said capacitive load 206 is the capacitive load crystal.
Further, the capacitance of said capacitive load crystal 2 06 is 5pf.
System of the present invention is as shown in Figure 2, and it can output voltage be 150V in the full range band, and it comprises wide-band linearity power amplifier 201, broadband feedback circuit 202, match circuit 203, build-out resistor 204, coupling cable 205, capacitive load crystal 2 06.
Said wide-band linearity power amplifier 201, being frequency is the linear power amplifier of 20～100MHz, it is as the driver of capacitive load, has operating frequency height, working frequency range is wide, output voltage is high advantage.
Said broadband feedback circuit 202; A part that is about to amplifier output signal feeds back to amplifier in input signal compares, and goes control to export with effective input signal of gained relatively, the present invention's employing be negative-feedback circuit; Like Fig. 3; It mainly is made up of an electric capacity 302, an inductance 301 and a resistance 303, and wherein inductance 301 is connected with the input of wide-band linearity power amplifier 201, and resistance 303 is connected with the output of wide-band linearity power amplifier 201.
Said match circuit 203 is the output matching circuit of power amplifier, and its main purpose is that the output impedance with power amplifier matches optimum matching point (this optimum matching point is 50 Ω; It is the standard value of the communications industry; Be the compromise value of minimal losses and maximum output, performance is best when matching this value), make output performance reach optimum; And can be complementary with capacitive load, realize maximum power output.Like Fig. 4 is match circuit of the present invention.It comprises matching capacitance 401, build-out resistor 402, coupling inductance 403.
Said build-out resistor 204, coupling cable 205, be and the resistance of capacitive load crystal 2 06 coupling, make the input impedance of capacitive load to be complementary with the output impedance of power amplifier, build-out resistor 204 also plays the effect that increases operational frequency bandwidth simultaneously.
Said capacitive load crystal 2 06, its capacitance are 5pf, and its operating frequency is 20～100MHz.
The wideband power amplifer of capacitive load of the present invention, the capacitive load crystal of a 5pf of driving, the operating frequency of power amplifier is 20～100MHz, and output voltage is 150V, and power output is 50W.
Compared with prior art, good effect of the present invention is:
The present invention has improved the operating frequency of capacitive load amplifier greatly; Enlarged utilized bandwidth; Improved output voltage, power, though the present invention is that example is described with the capacitive load of 5pf capacitance, the present invention not only is applicable to the capacitive load of 5pf capacitance; Can be used in multiple capacitive load, its structural principle all communicates.
Figure of description
The existing capacitive load driving amplifier of Fig. 1 sketch map;
The 101-power amplifier, 102-feedback circuit, 103-capacitive load;
Fig. 2 system schematic of the present invention;
201-wide-band linearity power amplifier, 202-broadband feedback circuit, the 203-match circuit, the 204-build-out resistor,
205-matees cable, 206-capacitive load crystal;
Fig. 3 feedback circuit figure;
The 301-inductance, 302-electric capacity, 303-resistance,
Fig. 4 match circuit figure;
The 401-matching capacitance, the 402-build-out resistor, 403-matees inductance.
Embodiment
The specific embodiment of the invention is following:
After signal amplifies through power amplifier; Export from the power amplifier output; Wherein a part feeds back to the input of power amplifier through the broadband feedback circuit; And after comparing with input signal, in the effective input signal input power amplifier that obtains, play the effect of control power amplifiers output signal with this.The main effect of feedback circuit is exactly to stablize quiescent point, stablize multiplication factor, improve input resistance, reduce output resistance and expand passband, and the components and parts of employing are resistance, inductance and electric capacity.
Because all there is the problem that low frequency is big, high frequency is little in the gain of general wideband power amplifer; So adopt the less electric capacity of capability value in the feedback circuit, the effect of played the resistance low frequency, leading to high frequency promptly compensates the decay of high-frequency signal; Make the flat gain of whole passband; Stablize multiplication factor, the capacitance of electric capacity 302 generally is chosen for 1K Ω between the 3K Ω, but also adjustment can be arranged as the case may be sometimes.Inductance plays logical low frequency usually; The effect of resistance high frequency can come the expansion low-frequency section with it, therefore in the concrete debug process of power amplifier; Select the collocation of suitable inductance and electric capacity; Can well expand whole logical frequency range, wherein electric capacity generally at 1K Ω to 3K Ω, confirm relatively the time in the time of the concrete debugging of inductance.The signal that can Control and Feedback be fed back into end through the adjustment resistance value.
The effect of match circuit is that the output impedance with power amplifier matches 50 Ω; Make output performance reach optimum; And can be complementary with the components and parts of back, realize maximum power output, the match circuit in this programme also makes output voltage in the whole passband at 150V.
The effect of build-out resistor is similar to the match circuit of power amplifier, and its effect is to make the input impedance of capacitive load to be complementary with the output impedance of power amplifier.Pure theoretically capacitive load can't match 50 Ω; Though connect the effect that the cable of match circuit or capacitive load can provide certain resistance; But that also only is can mate in theory, can find during practical application to be difficult to just rely on cable just capacitive load to be matched 50 Ω.Certainly mate capacitive load except the method for the parallel resistance that is applied among the present invention, can also adopt the method for series resistance and series inductance, but series resistance can reduce the voltage on the link, make output voltage can't reach 150V; Though produce the effect that resonance also can play coupling with inductance and capacitive load, inductance can limiting bandwidth.
Find that in actual application different coupling cable lengths is very big to the influence of system; When cable length is the signal wavelength four that transmits in the system/for the moment; The output of system is stablized and is touched the mark; Therefore system disposition the corresponding different wavelengths of cable of a plurality of length, it plays the effect of Broadband Matching device.
Find that in the system debug process in the adding system, system can not reach the best output of the frequency range of wanting after match circuit, build-out resistor and coupling cable are debugged optimum state separately; The present invention is with in the three adding system simultaneously; And unified the debugging, make system reach the capacitive load crystal that drives a 5pf, the operating frequency of power amplifier is 20～100MHz; Output voltage is 150V, and power output is 50W.
Claims (10)
1. the wideband power amplifer of a capacitive load; It is characterized in that comprising a wide-band linearity power amplifier (201); Connect a broadband feedback circuit (202) between said wide-band linearity power amplifier (201) input, the output, the output of said wide-band linearity power amplifier (201) is connected with a match circuit (203); Said match circuit (203) output is connected with a build-out resistor (205), a build-out resistor (204) respectively; Said build-out resistor (205) other end is connected with a capacitive load (206); The other end of said capacitive load (206), build-out resistor (204) is connected with ground wire respectively; Wherein, said build-out resistor (204), build-out resistor (205) are and the resistance of capacitive load (206) coupling, the input impedance of capacitive load (206) can be complementary with the output impedance of wide-band linearity power amplifier (201).
2. wideband power amplifer as claimed in claim 1; It is characterized in that said match circuit (203) is the output matching circuit of said wide-band linearity power amplifier (201), be used for the output impedance of wide-band linearity power amplifier (201) is matched optimum matching point.
3. wideband power amplifer as claimed in claim 2 is characterized in that said optimum matching point is 50 ohm.
4. like claim 1 or 2 or 3 described wideband power amplifers, it is characterized in that said match circuit (203) comprises a plurality of matching capacitance, a plurality of build-out resistor, a coupling inductance; Wherein, signal input part is connected with an end of one second matching capacitance, said coupling inductance respectively through one first matching capacitance; The other end of said coupling inductance is connected with an end of one the 3rd matching capacitance, the 4th matching capacitance respectively; The other end of said the 3rd matching capacitance is connected with an end of one the 5th matching capacitance, first build-out resistor respectively; The other end of said first build-out resistor is connected with an end of one second build-out resistor, one the 3rd build-out resistor respectively; The other end of said second build-out resistor is connected with one the 6th matching capacitance, one end, and said the 6th matching capacitance other end is connected with an end of one the 7th matching capacitance, the 8th matching capacitance respectively, and the other end of said the 8th matching capacitance is as signal output part; The other end of said second matching capacitance, the 4th matching capacitance, the 5th matching capacitance, the 7th matching capacitance, the 3rd build-out resistor is connected with ground wire respectively.
5. wideband power amplifer as claimed in claim 1 is characterized in that said build-out resistor (205) is a coupling cable, and wherein, the coupling cable length is 1/4th of a transmitted signal wavelengths.
6. wideband power amplifer as claimed in claim 1 is characterized in that said broadband feedback circuit comprises an inductance (301), an electric capacity (302) and a resistance (303) of series connection successively; Wherein, an end of said inductance (301) is connected with the input of said wide-band linearity power amplifier (201), and an end of said resistance (303) is connected with the output of said wide-band linearity power amplifier (201).
7. wide-band linearity power amplifier as claimed in claim 6, the capacitance value that it is characterized in that said electric capacity (302) are 1K Ω～3K Ω.
8. wideband power amplifer as claimed in claim 1 is characterized in that said wide-band linearity power amplifier (201) is the linear power amplifier of frequency at 20～100MHz.
9. wideband power amplifer as claimed in claim 1 is characterized in that said capacitive load (206) is the capacitive load crystal.
10. wideband power amplifer as claimed in claim 9, the capacitance that it is characterized in that said capacitive load crystal (206) is 5pf.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101230923A CN102647161A (en) | 2012-04-24 | 2012-04-24 | Wideband power amplifier for capacitive load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101230923A CN102647161A (en) | 2012-04-24 | 2012-04-24 | Wideband power amplifier for capacitive load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947744A (en) * | 2017-11-28 | 2018-04-20 | 广东工业大学 | The power amplifier and millimeter wave chip of a kind of power combing type |
| CN114978919A (en) * | 2022-06-14 | 2022-08-30 | 湖南大学 | Transducer Bandwidth Widening Method and Device Using Switch-Type Non-Foster System |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2059034U (en) * | 1989-11-01 | 1990-07-04 | 赖奇志 | Antenna amplifier |
| CN1554146A (en) * | 2001-09-13 | 2004-12-08 | �ʼҷ����ֵ��ӹɷ�����˾ | Active tunable filter circuit |
| CN1976544A (en) * | 2005-11-29 | 2007-06-06 | 精工爱普生株式会社 | Capacitive load driving circuit, electrostatic transducer, ultrasonic speaker |
| CN101291141A (en) * | 2007-04-19 | 2008-10-22 | 株式会社普来马特 | Resistance matching method and system for performing the method |
| CN202679316U (en) * | 2012-04-24 | 2013-01-16 | 北京琅拓科电子设备有限公司 | Capacitive load wideband power amplifier |
-
2012
- 2012-04-24 CN CN2012101230923A patent/CN102647161A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2059034U (en) * | 1989-11-01 | 1990-07-04 | 赖奇志 | Antenna amplifier |
| CN1554146A (en) * | 2001-09-13 | 2004-12-08 | �ʼҷ����ֵ��ӹɷ�����˾ | Active tunable filter circuit |
| CN1976544A (en) * | 2005-11-29 | 2007-06-06 | 精工爱普生株式会社 | Capacitive load driving circuit, electrostatic transducer, ultrasonic speaker |
| CN101291141A (en) * | 2007-04-19 | 2008-10-22 | 株式会社普来马特 | Resistance matching method and system for performing the method |
| CN202679316U (en) * | 2012-04-24 | 2013-01-16 | 北京琅拓科电子设备有限公司 | Capacitive load wideband power amplifier |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947744A (en) * | 2017-11-28 | 2018-04-20 | 广东工业大学 | The power amplifier and millimeter wave chip of a kind of power combing type |
| CN114978919A (en) * | 2022-06-14 | 2022-08-30 | 湖南大学 | Transducer Bandwidth Widening Method and Device Using Switch-Type Non-Foster System |
| CN114978919B (en) * | 2022-06-14 | 2024-01-09 | 湖南大学 | Method and device for widening bandwidth of transducer by using switch type non-foster system |
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Application publication date: 20120822 |