CN201854247U - Impedance matching power amplification output circuit - Google Patents
Impedance matching power amplification output circuit Download PDFInfo
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- CN201854247U CN201854247U CN2010206201548U CN201020620154U CN201854247U CN 201854247 U CN201854247 U CN 201854247U CN 2010206201548 U CN2010206201548 U CN 2010206201548U CN 201020620154 U CN201020620154 U CN 201020620154U CN 201854247 U CN201854247 U CN 201854247U
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Abstract
The utility model discloses an impedance matching power amplification output circuit. Two differential rectifier circuits are adopted at an input stage of the output circuit, a valve tube V262 and a valve tube V263 form a differential amplifier circuit, a valve tube V264 and a valve tube V265 form another differential amplifier circuit, a valve tube V266 and a valve tube 267 form a constant-current load of the secondary differential amplifier circuit, while double-end output of the differential amplifier circuit is converted into single-end output, a complementary symmetric power amplifier circuit is in an output stage, a valve tube V270 and a valve tube form a composite transistor NPN (negative-positive-negative), a valve tube V502 and a valve tube V271 form a composite transistor PNP, and a valve tube V268, a valve tube V275, a resistor R366, a valve tube V269 and a valve tube V277 establish starting voltage required for powering on the transistor NPN and the transistor PNP so as to eliminate crossover distortion. The impedance matching power amplification output circuit adopts an OCL (output capacitorless) circuit, output impedance is 0.5 omega, output amplitude is larger than or equal to 20 VP-P, loading capacity is higher, power is outputted directly from the amplifier circuit in the '0.5 omega' state, and the maximum output power is up to 10W.
Description
Technical field
The utility model relates to power amplification, is specifically related to a kind of impedance matching power amplification output circuit.
Background technology
Utilize power transfer the electric current for according to input signal change of the voltage control effect of the Current Control effect of triode or field effect transistor with power supply.Because sound is the ripple of various amplitude and different frequency, it is AC signal current, the collector current of triode is β times of base current forever, β is the interchange multiplication factor of triode, use this point, if small-signal is injected base stage, then the electric current that flows through of collector electrode can equal base current β doubly, then this signal is isolated with capacitance, just having obtained electric current (or voltage) is original β large-signal doubly, this phenomenon becomes the amplification of triode, through continuous electric current and voltage amplification, has just finished power amplification.Be divided into two kinds in arrowband high frequency power amplifier and wideband high-frequency power amplifier by the width of its working band, the arrowband high frequency power amplifier usually with frequency selection circuit with frequency-selective filtering effect as output loop, so be called tune power amplifier or tuned power amplifier again; The output circuit of wideband high-frequency power amplifier then is line transformer or other broadband matching circuits, therefore claims again
Be the nonresonant power amplifier.High frequency power amplifier is a kind of power conversion device, and the dc energy that it supplies with power supply is converted into high-frequency ac output.Impedance matching is meant that load impedance and driving source internal resistance impedance are fit to join, and obtains a kind of operating state of maximum power output.
Summary of the invention
The purpose of this utility model is: a kind of impedance matching power amplification output circuit is provided, and this output circuit connects 50 Ω, 75 Ω, 150 Ω, 600 Ω, 5K Ω even load reaches the sinusoidal wave power output about 4W.
Technical solution of the present utility model is: this circuit is by dual power supply, signal enters through R351 resistance, input stage adopts the two poles of the earth differential amplifier circuit, by V262, V263 forms the amplifying circuit of a difference, V264, V265 forms the differential amplifier circuit of another grade, V266, V267 forms the Constant Current Load of the moving amplifying circuit of second extreme difference, both-end output with differential amplifier circuit simultaneously is converted into single-ended output, output stage is complementary symmetrical power amplification circuit, V270, V501 forms multiple tube NPN, V502, V271 forms multiple tube PNP, and V268, V275, R366, V269, V277 sets up NPN and the required cut-in voltage of PNP pipe conducting, to eliminate intermodulation distortion; Output resistance R405, C265 are used for suppressing high-frequency self-excitation, and resistance R 364 forms the Voltage Series negative-feedback circuit, and the power amplifier output adds the self-recovering type fuse, does overcurrent protection, and have overcurrent protection to protect alert circuit; Concrete connection is as follows: signal is extremely continuous with the b of V262 through R351, and is connected with C242 with R352, R353, the other end ground connection of R352, C242, and another termination potentiometer RP118 centre cap of R353, two taps connect respectively+15V and 15V in addition; The e utmost point of V262 extremely link to each other with the e of V263 and with the joining of R356, the other end of R356 extremely links to each other with the c of V261, the e utmost point of V261 links to each other with R355 resistance, another termination of R355+25V power supply, V261's
bThe utmost point connects the negative pole of R354 and V273, the other end ground connection of R354, the positive pole of V273 links to each other with the negative pole of V272, and the positive pole of V272 links to each other with power supply+25V, the c utmost point of V262 meets R357 and joins with the b utmost point of V265, and be connected with resistance R 357, another termination-25V of R357, the e utmost point and the R356 of V262 join, and extremely link to each other with the e of V263, the c utmost point of V263 links to each other with resistance R 358, and extremely links to each other with the b of V264, another termination-25V of R358; The b utmost point of V263 links to each other with resistance R 364, and be connected with R363, the other end ground connection of R363, the e utmost point of another termination V268 of R364 also extremely links to each other with the e of V269, the c utmost point of V268 links to each other with the negative pole of V275, the positive pole of V275 extremely links to each other with the c utmost point of C246, R365, V266, the e utmost point of V267, the b of V270, and the centre cap of another termination potentiometer RP119 of V275 links to each other with other end short circuit place and with electric capacity V245; The b utmost point of another termination V267 of R365, and link to each other with the potentiometer RP119 other end, the c utmost point of V267 extremely links to each other with the c of V265, and that end that links to each other with potentiometer with C245, with the negative pole of V277, extremely link to each other with the b of V271, the b utmost point of V266 links to each other with the negative pole of V274, and link to each other with R361, the positive level of V274 links to each other another termination+25V of R359 with resistance R 359; The c utmost point of another termination V264 of R361, the e utmost point of V264 extremely links to each other with the e of V265 and links to each other with resistance R 362, another termination-25V of R362, and the b utmost point of V265 links to each other with the C245 other end, the c utmost point of V269 links to each other with the positive pole of V277, the negative pole of V277 extremely links to each other with the b of V271, and the b utmost point of V269 links to each other with R370 resistance, and links to each other with C248, the other end of R370 links to each other with the other end of C248, and link to each other with R373, and R375 links to each other, and extremely link to each other with the e of V502; The b utmost point of V269 also links to each other with the negative pole of V278, and links to each other with R369, another termination-25V of R369, and the positive pole of V278 links to each other with R371, the other end ground connection of R371; The b utmost point of V268 and resistance R 367 and with the positive pole of C274 and V276, and link to each other with R366, the other end of R366 links to each other with+25V; The negative pole of V276 links to each other with resistance R 368, the other end ground connection of R368, and the other end of R367 links to each other with the other end of C274, and link to each other with R372, and extremely link to each other with the e of V501, and link to each other with R374, the R374 other end links to each other with the other end of R375, and is connected to final output with R405; The other end of R405 links to each other with C265, and the other end ground connection of C265; The c utmost point of V270 connects+25V, and the c utmost point of V501 connects+25V, and the c utmost point of V271 connects+25V, and the c utmost point of V502 connects+25V, and the e utmost point of V271 extremely links to each other with the b of V502, and C294, C250, C251, C251 are the power unit filter capacitor.
The OCL circuit is adopted in power amplification of the present utility model, and output impedance is 0.5 Ω, and output amplitude has stronger load capacity more than or equal to 20VP-P, and under " 0.5 Ω " shelves state, directly from amplifying circuit output, maximum power output can reach 10W.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Further specify technical solution of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 1, this circuit is by dual power supply, signal enters through R351 resistance, input stage adopts the two poles of the earth differential amplifier circuit, by V262, V263 forms the amplifying circuit of a difference, V264, V265 form the differential amplifier circuit of another grade, V266, V267 forms the Constant Current Load of the moving amplifying circuit of second extreme difference, both-end output with differential amplifier circuit simultaneously is converted into single-ended output, output stage is complementary symmetrical power amplification circuit, V270, V501 forms multiple tube NPN, V502, V271 forms multiple tube PNP, and V268, V275, R366, V269, V277 sets up NPN and the required cut-in voltage of PNP pipe conducting, to eliminate intermodulation distortion; Output resistance R405, C265 are used for suppressing high-frequency self-excitation, and resistance R 364 forms the Voltage Series negative-feedback circuit, and the power amplifier output adds the self-recovering type fuse, does overcurrent protection, and have overcurrent protection to protect alert circuit; Concrete connection is as follows: signal is extremely continuous with the b of V262 through R351, and is connected with C242 with R352, R353, the other end ground connection of R352, C242, and another termination potentiometer RP118 centre cap of R353, two taps connect respectively+15V and 15V in addition; The e utmost point of V262 extremely link to each other with the e of V263 and with the joining of R356, the other end of R356 extremely links to each other with the c of V261, the e utmost point of V261 links to each other with R355 resistance, another termination of R355+25V power supply, V261's
bThe utmost point connects the negative pole of R354 and V273, the other end ground connection of R354, the positive pole of V273 links to each other with the negative pole of V272, and the positive pole of V272 links to each other with power supply+25V, the c utmost point of V262 meets R357 and joins with the b utmost point of V265, and be connected with resistance R 357, another termination-25V of R357, the e utmost point and the R356 of V262 join, and extremely link to each other with the e of V263, the c utmost point of V263 links to each other with resistance R 358, and extremely links to each other with the b of V264, another termination-25V of R358; The b utmost point of V263 links to each other with resistance R 364, and be connected with R363, the other end ground connection of R363, the e utmost point of another termination V268 of R364 also extremely links to each other with the e of V269, the c utmost point of V268 links to each other with the negative pole of V275, the positive pole of V275 extremely links to each other with the c utmost point of C246, R365, V266, the e utmost point of V267, the b of V270, and the centre cap of another termination potentiometer RP119 of V275 links to each other with other end short circuit place and with electric capacity V245; The b utmost point of another termination V267 of R365, and link to each other with the potentiometer RP119 other end, the c utmost point of V267 extremely links to each other with the c of V265, and that end that links to each other with potentiometer with C245, with the negative pole of V277, extremely link to each other with the b of V271, the b utmost point of V266 links to each other with the negative pole of V274, and link to each other with R361, the positive level of V274 links to each other another termination+25V of R359 with resistance R 359; The c utmost point of another termination V264 of R361, the e utmost point of V264 extremely links to each other with the e of V265 and links to each other with resistance R 362, another termination-25V of R362, and the b utmost point of V265 links to each other with the C245 other end, the c utmost point of V269 links to each other with the positive pole of V277, the negative pole of V277 extremely links to each other with the b of V271, and the b utmost point of V269 links to each other with R370 resistance, and links to each other with C248, the other end of R370 links to each other with the other end of C248, and link to each other with R373, and R375 links to each other, and extremely link to each other with the e of V502; The b utmost point of V269 also links to each other with the negative pole of V278, and links to each other with R369, another termination-25V of R369, and the positive pole of V278 links to each other with R371, the other end ground connection of R371; The b utmost point of V268 and resistance R 367 and with the positive pole of C274 and V276, and link to each other with R366, the other end of R366 links to each other with+25V; The negative pole of V276 links to each other with resistance R 368, the other end ground connection of R368, and the other end of R367 links to each other with the other end of C274, and link to each other with R372, and extremely link to each other with the e of V501, and link to each other with R374, the R374 other end links to each other with the other end of R375, and is connected to final output with R405; The other end of R405 links to each other with C265, and the other end ground connection of C265; The c utmost point of V270 connects+25V, and the c utmost point of V501 connects+25V, and the c utmost point of V271 connects+25V, and the c utmost point of V502 connects+25V, and the e utmost point of V271 extremely links to each other with the b of V502, and C294, C250, C251, C251 are the power unit filter capacitor.
Claims (1)
1. impedance matching power amplification output circuit, it is characterized in that: this circuit is by dual power supply, signal enters through R351 resistance, input stage adopts the two poles of the earth differential amplifier circuit, by V262, V263 forms the amplifying circuit of a difference, V264, V265 forms the differential amplifier circuit of another grade, V266, V267 forms the Constant Current Load of the moving amplifying circuit of second extreme difference, both-end output with differential amplifier circuit simultaneously is converted into single-ended output, output stage is complementary symmetrical power amplification circuit, V270, V501 forms multiple tube NPN, V502, V271 forms multiple tube PNP, and V268, V275, R366, V269, V277 sets up NPN and the required cut-in voltage of PNP pipe conducting, to eliminate intermodulation distortion; Output resistance R405, C265 are used for suppressing high-frequency self-excitation, and resistance R 364 forms the Voltage Series negative-feedback circuit, and the power amplifier output adds the self-recovering type fuse, does overcurrent protection, and have overcurrent protection to protect alert circuit; Concrete connection is as follows: signal is extremely continuous with the b of V262 through R351, and is connected with C242 with R352, R353, the other end ground connection of R352, C242, and another termination potentiometer RP118 centre cap of R353, two taps connect respectively+15V and 15V in addition; The e utmost point of V262 extremely link to each other with the e of V263 and with the joining of R356, the other end of R356 extremely links to each other with the c of V261, the e utmost point of V261 links to each other with R355 resistance, another termination of R355+25V power supply, V261's
bThe utmost point connects the negative pole of R354 and V273, the other end ground connection of R354, the positive pole of V273 links to each other with the negative pole of V272, and the positive pole of V272 links to each other with power supply+25V, the c utmost point of V262 meets R357 and joins with the b utmost point of V265, and be connected with resistance R 357, another termination-25V of R357, the e utmost point and the R356 of V262 join, and extremely link to each other with the e of V263, the c utmost point of V263 links to each other with resistance R 358, and extremely links to each other with the b of V264, another termination-25V of R358; The b utmost point of V263 links to each other with resistance R 364, and be connected with R363, the other end ground connection of R363, the e utmost point of another termination V268 of R364 also extremely links to each other with the e of V269, the c utmost point of V268 links to each other with the negative pole of V275, the positive pole of V275 extremely links to each other with the c utmost point of C246, R365, V266, the e utmost point of V267, the b of V270, and the centre cap of another termination potentiometer RP119 of V275 links to each other with other end short circuit place and with electric capacity V245; The b utmost point of another termination V267 of R365, and link to each other with the potentiometer RP119 other end, the c utmost point of V267 extremely links to each other with the c of V265, and that end that links to each other with potentiometer with C245, with the negative pole of V277, extremely link to each other with the b of V271, the b utmost point of V266 links to each other with the negative pole of V274, and link to each other with R361, the positive level of V274 links to each other another termination+25V of R359 with resistance R 359; The c utmost point of another termination V264 of R361, the e utmost point of V264 extremely links to each other with the e of V265 and links to each other with resistance R 362, another termination-25V of R362, and the b utmost point of V265 links to each other with the C245 other end, the c utmost point of V269 links to each other with the positive pole of V277, the negative pole of V277 extremely links to each other with the b of V271, and the b utmost point of V269 links to each other with R370 resistance, and links to each other with C248, the other end of R370 links to each other with the other end of C248, and link to each other with R373, and R375 links to each other, and extremely link to each other with the e of V502; The b utmost point of V269 also links to each other with the negative pole of V278, and links to each other with R369, another termination-25V of R369, and the positive pole of V278 links to each other with R371, the other end ground connection of R371; The b utmost point of V268 and resistance R 367 and with the positive pole of C274 and V276, and link to each other with R366, the other end of R366 links to each other with+25V; The negative pole of V276 links to each other with resistance R 368, the other end ground connection of R368, and the other end of R367 links to each other with the other end of C274, and link to each other with R372, and extremely link to each other with the e of V501, and link to each other with R374, the R374 other end links to each other with the other end of R375, and is connected to final output with R405; The other end of R405 links to each other with C265, and the other end ground connection of C265; The c utmost point of V270 connects+25V, and the c utmost point of V501 connects+25V, and the c utmost point of V271 connects+25V, and the c utmost point of V502 connects+25V, and the e utmost point of V271 extremely links to each other with the b of V502, and C294, C250, C251, C251 are the power unit filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206201548U CN201854247U (en) | 2010-11-23 | 2010-11-23 | Impedance matching power amplification output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206201548U CN201854247U (en) | 2010-11-23 | 2010-11-23 | Impedance matching power amplification output circuit |
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|---|---|
| CN201854247U true CN201854247U (en) | 2011-06-01 |
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| CN2010206201548U Expired - Fee Related CN201854247U (en) | 2010-11-23 | 2010-11-23 | Impedance matching power amplification output circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013120393A1 (en) * | 2012-02-13 | 2013-08-22 | Jin Haihui | Concise, highly effective super power amplifier |
| CN105429603A (en) * | 2014-09-12 | 2016-03-23 | Ess技术有限公司 | Two differential amplifier configuration |
-
2010
- 2010-11-23 CN CN2010206201548U patent/CN201854247U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013120393A1 (en) * | 2012-02-13 | 2013-08-22 | Jin Haihui | Concise, highly effective super power amplifier |
| CN105429603A (en) * | 2014-09-12 | 2016-03-23 | Ess技术有限公司 | Two differential amplifier configuration |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20131123 |