CN1388642A - Curent-type sychronous super-class A bias circuit - Google Patents

Curent-type sychronous super-class A bias circuit Download PDF

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CN1388642A
CN1388642A CN 01108463 CN01108463A CN1388642A CN 1388642 A CN1388642 A CN 1388642A CN 01108463 CN01108463 CN 01108463 CN 01108463 A CN01108463 A CN 01108463A CN 1388642 A CN1388642 A CN 1388642A
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constant
mirror
constant flow
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CN1228917C (en
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康为民
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Abstract

The current-type synchronous super-class A bias circuit includes two pairs of constant-current sources; two constant-voltage bias circuits between the two pairs of constant-current sources; and two symmetrical mirror image constant-current sources between the two constant-voltage bias circuits. The super-class A bias circuit has signal input end in the joint between the two symmetrical mirror image constant-current sources; positive and negative output ends in the two ends of the two constant-voltage bias circuits separately; and the output end for the loudspeaker led out between the positive and negative output ends via two voltage dividing resistors. The present invention has less influence to the front stage, excellent compensation effect and no switching distortion and cross-over distortion.

Description

Curent-type sychronous super-class A bias circuit
The present invention relates to a kind of compensating circuit of audio-frequency power amplifier, particularly a kind of circuit that the final stage signal of power amplifier is compensated.
How solving switch distortion and the intermodulation distortion of electric current amplifying stage (final stage) when high-power output in the audio-frequency power amplifier, is the problem that is of long duration.Theoretically, super Class A bias compensation is the most effectual way that solves this class distortion, super Class A bias compensation is a kind of dynamic bias compensation, it gathers the signal amplitude of prime output constantly, correspondingly adjust bias voltage, so that whenever backward end (relative signal phase place) power transistor all do not end, thereby stop switch distortion and intermodulation distortion in the rated power output area.Existing super Class A bias compensation effect is all undesirable.Reason is that they all adopt voltage sampling, and their equiva lent impedance is all very little.Voltage sampling makes sampled signal be subjected to having a strong impact on of inductive load loud speaker, and the regulation and control action error is big, even disorderly, has reduced the service behaviour of super Class A bias compensation; The little overload that then causes prime of equiva lent impedance makes its major cycle, and the sense of losing more than gain is arranged.Therefore, existing super Class A bias compensation circuit overall application effect is not satisfactory.
The objective of the invention is to: a kind of curent-type sychronous super-class A bias circuit is provided.It adopts current sampling, has eliminated the influence of loud speaker to sampled signal; And the equiva lent impedance of compensation is big, and the performance of front stage circuits is not had any harmful effect; The serious switch distortion and the intermodulation distortion that have existed when having eliminated the high-power output of power amplifier.
The present invention is achieved in that curent-type sychronous super-class A bias circuit, and it comprises two pairs of constant-current sources, is connected on two constant voltage biasing circuits between two pairs of constant-current sources and is connected on two symmetrical mirror-image constant flow sources between two constant voltage biasing circuits; Wherein a pair of constant-current source is by the identical constant-current source circuit S of parameter 1, S 3Form, another to constant-current source by the identical constant-current source circuit S of parameter 2, S 4Form; A constant voltage biasing circuit is by PNP triode T 1, resistance R 1, R 2Constitute T 1Emitter and constant-current source S 1Output join and draw the positive output end npn of super class A bias circuit, T 1Collector electrode and NPN triode T 2, T 3, resistance R 3, R 4The input T of the mirror-image constant flow source that constitutes 2Collector electrode join the output T of this mirror-image constant flow source 3Collector electrode and constant-current source S 2Output join and through capacitor C 1With T 1Base stage is joined; Another constant voltage biasing circuit is by NPN triode T 6, resistance R 6, R 7Constitute T 6Emitter and constant-current source S 3Input join and draw the negative output terminal pnp of super class A bias circuit, T 6Collector electrode and PNP triode T 7, T 8, resistance R 8, R 9The input T of the mirror-image constant flow source that constitutes 7Collector electrode join the output T of this mirror-image constant flow source 8Collector electrode and constant-current source S 4Input join, and through capacitor C 2With T 6Base stage is joined; Between positive output end npn and negative output terminal pnp, be connected to divider resistance R 11, R 12, R 11, R 12The junction draw the loud speaker output of super class A bias circuit; The junction of two mirror-image constant flow sources is the signal input part of super class A bias circuit.
In the above-mentioned curent-type sychronous super-class A bias circuit, between two mirror-image constant flow sources, be connected to two mirror-image constant flow sources; Wherein with NPN pipe T 2, T 3What the mirror-image constant flow source that constitutes joined is by PNP pipe T 4, T 5The mirror-image constant flow source that constitutes; With PNP pipe T 7, T 8What the mirror-image constant flow source that constitutes joined is by T 9, T 10The mirror-image constant flow source that constitutes; T 4, T 5, T 9, T 10The base stage common point be the signal input part of super class A bias circuit.
Compared with the prior art, the present invention adopts current sampling, and the equiva lent impedance of entire circuit is big, has solved exist in the bias compensation of super Class A big to the front stage circuits influence, the problem that compensation effect is bad.Have simple in structurely, be easy to make, cost of manufacture is low, and net synchronization capability is good, and compensation effect is good, can eliminate switch distortion and intermodulation distortion, can improve the characteristics of the integral working of power amplifier.Can be used in the transistor power amplifier, and other need eliminate the occasion of switch distortion and intermodulation distortion.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Accompanying drawing 1 is an electrical block diagram of the present invention;
Accompanying drawing 2 is the electrical block diagrams after Fig. 1 structure has increased the steady stability circuit;
Embodiment: the formation of curent-type sychronous super-class A bias circuit comprises two pairs of constant-current sources, is connected on two constant voltage biasing circuits between two pairs of constant-current sources and is connected on two symmetrical mirror-image constant flow sources between two constant voltage biasing circuits.Wherein a pair of constant-current source is by the identical constant-current source S of parameter 1, S 3Form, another to constant-current source by the identical constant-current source S of parameter 2, S 4Form; A constant voltage biasing circuit is by PNP triode T 1, resistance R 1, R 2Constitute T 1Emitter and constant-current source S 1Output join and draw the positive output end npn of super class A bias circuit, T 1Collector electrode and NPN triode T 2, T 3, resistance R 3, R 4The input T of the mirror-image constant flow source that constitutes 2Collector electrode join the output T of this mirror-image constant flow source 3Collector electrode and constant-current source S 2Join and through capacitor C 1With T 1Base stage is joined; Another constant voltage biasing circuit is by NPN triode T 6, resistance R 6, R 7Constitute T 6Emitter and constant-current source S 3Input join and draw the negative output terminal pnp of super class A bias circuit, T 6Collector electrode and PNP triode T 7, T 8, resistance R 8, R 9The input T of the mirror-image constant flow source that constitutes 7Collector electrode join the output T of this mirror-image constant flow source 8Collector electrode and constant-current source S 4Input join, and through capacitor C 2With T 6Base stage is joined; Be connected to divider resistance R at positive output end npn and negative defeated rectifying between the pnp 11, R 12,, R 11, R 12The junction draw the loud speaker output of super class A bias circuit; The junction of two mirror-image constant flow sources is the signal input part of biasing circuit.
Between two mirror-image constant flow sources, also be connected to two mirror-image constant flow sources, as shown in Figure 2; Wherein with NPN pipe T 2, T 3What the mirror-image constant flow source that constitutes joined is by PNP pipe T 4, T 5The mirror-image constant flow source that constitutes; With PNP pipe T 7, T 8What the mirror-image constant flow source that constitutes joined is by T 9, T 10The mirror-image constant flow source that constitutes; T 4, T 5, T 9, T 10The base stage common point be the signal input part of super class A bias circuit.This partial circuit can improve the static properties of super class A bias circuit, makes the adaptability of super class A bias circuit stronger.
During work, the signal output part of the signal input part of super class A bias circuit and the voltage amplifier stage of power amplifier joins.The NPN pipe T of the positive output end npn pin of super class A bias circuit and the electric current amplifying stage of power amplifier 11Base stage join the PNP of the electric current amplifying stage of negative output terminal pnp pin and power amplifier pipe T 12Base stage join.Constant-current source S 1, S 3Input and amplifirer+the 50V power supply joins constant-current source S 2, S 4Output and-50 volts of power supplys of amplifirer join.The loud speaker output can directly join with the loud speaker of amplifirer; Also " X " in the accompanying drawing 2 can be located to disconnect, join by chain-dotted line and earth resistance R, with the input impedance of resistance R analog current amplifying stage, the compensation effect of super like this class A bias circuit is better.
Operation principle when the signal input part of super class A bias circuit has the positive signal input, flows through T 1Electric current reduce, flow through T 3Electric current also equivalent reduce because S 2And S 4The constant current effect, this part electric current of minimizing is through C 1, R 2, T 8Enter S 4, at R 2Last generation pressure drop.T has been kept in this pressure drop 12Bias voltage, it is not ended, realize the biasing of super Class A.This electric current is numerically equal to the signal code of input, and its size is decided by the input impedance of back level (electric current amplifying stage) circuit.Negative signal comes interim, S 2Electric current through T 3, R 7, C 2Enter S 4, at R 7Last generation pressure drop is to keep T 11Bias voltage.R 1, R 2, T 1And R 6, R 7, T 6Form two conventional constant voltage biasing circuits respectively, the thermal compensation performance that it is good has guaranteed the late-class circuit steady operation.
From the operation principle of above curent-type sychronous super-class A as can be seen, sampled signal (also being control signal simultaneously) is exactly the AC audio current signal of input, its size is only relevant with the input impedance of electric current amplifying stage, avoided the influence of loud speaker back electromotive force, the action that is to say this super class A bias circuit has been accomplished with input exchange signal precisely synchronous, simultaneously very stable.The operating current of this biasing circuit need not ask for signal code, and the equiva lent impedance of super class A bias circuit is big for the special constant-current source that is provided with provides, and the performance of voltage amplifier circuit is not had a bit adverse effect.Should build on the basis of constant voltage biasing circuit by super class A bias circuit, therefore have the same thermal stability of constant voltage biasing circuit.When making, do not need performance adjustment, do not need complicated calculating, so the productivity of this super class A bias circuit is very good yet.

Claims (2)

1, curent-type sychronous super-class A bias circuit is characterized in that: it comprises two pairs of constant-current sources, is connected on two constant voltage biasing circuits between two pairs of constant-current sources and is connected on two symmetrical mirror-image constant flow sources between two constant voltage biasing circuits; Wherein a pair of constant-current source is by the identical constant-current source S of parameter 1, S 3Form, another to constant-current source by the identical constant-current source S of parameter 2, S 4Form; A constant voltage biasing circuit is by PNP triode T 1, resistance R 1, R 2Constitute T 1Emitter and constant-current source S 1Output join and draw the positive output end npn of super class A bias circuit, T 1Collector electrode and NPN triode T 2, T 3, resistance R 3, R 4The input T of the mirror-image constant flow source that constitutes 2Collector electrode join the output T of this mirror-image constant flow source 3Collector electrode and constant-current source S 2Join and through capacitor C 1With T 1Base stage is joined; Another constant voltage biasing circuit is by NPN triode T 6, resistance R 6, R 7Constitute T 6Emitter and constant-current source S 3Input join and draw the negative output terminal pnp of super class A bias circuit, T 6Collector electrode and PNP triode T 7, T 8, resistance R 8, R 9The input T of the mirror-image constant flow source that constitutes 7Collector electrode join the output T of this mirror-image constant flow source 8Collector electrode and constant-current source S 4Input join, and through capacitor C 2With T 6Base stage is joined; Between positive output end npn and negative output terminal pnp, be connected to divider resistance R 11, R 12, R 11, R 12The junction draw the loud speaker output of super class A bias circuit; The junction of two mirror-image constant flow sources is the signal input part of super class A bias circuit.
2, curent-type sychronous super-class A biasing biasing circuit according to claim 1 is characterized in that: also be connected to two mirror-image constant flow sources between two mirror-image constant flow sources; Wherein with NPN pipe T 2, T 3What the mirror-image constant flow source that constitutes joined is by PNP pipe T 4, T 5The mirror-image constant flow source that constitutes; With PNP pipe T 7, T 8What the mirror-image constant flow source that constitutes joined is by T 9, T 10The mirror-image constant flow source that constitutes; T 4, T 5, T 9, T 10The base stage common point be the signal input part of super class A bias circuit.
CN 01108463 2001-05-25 2001-05-25 Curent-type sychronous super-class A bias circuit Expired - Fee Related CN1228917C (en)

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Application Number Priority Date Filing Date Title
CN 01108463 CN1228917C (en) 2001-05-25 2001-05-25 Curent-type sychronous super-class A bias circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104683910A (en) * 2013-11-26 2015-06-03 展讯通信（上海）有限公司 Circuit capable of suppressing audio output noise and audio output circuit
CN104682880A (en) * 2013-11-26 2015-06-03 展讯通信（上海）有限公司 Circuit for restraining audio output noise and audio output circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104683910A (en) * 2013-11-26 2015-06-03 展讯通信（上海）有限公司 Circuit capable of suppressing audio output noise and audio output circuit
CN104682880A (en) * 2013-11-26 2015-06-03 展讯通信（上海）有限公司 Circuit for restraining audio output noise and audio output circuit
CN104682880B (en) * 2013-11-26 2018-01-26 展讯通信（上海）有限公司 Suppress the circuit and audio output circuit of audio output noise
CN104683910B (en) * 2013-11-26 2018-03-23 展讯通信（上海）有限公司 Suppress the circuit and audio output circuit of audio output noise

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