CN1175559C - Power amplifier without cross-over distortion - Google Patents
Power amplifier without cross-over distortion Download PDFInfo
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- CN1175559C CN1175559C CNB001259636A CN00125963A CN1175559C CN 1175559 C CN1175559 C CN 1175559C CN B001259636 A CNB001259636 A CN B001259636A CN 00125963 A CN00125963 A CN 00125963A CN 1175559 C CN1175559 C CN 1175559C
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Abstract
The present invention relates to a power amplifier without cross-over distortion, particularly to a circuit for eliminating the cross-over distortion of secondary power amplifiers. The circuit comprises a constant voltage circuit, a cross-over distortion eliminating circuit and a three-stage Darlington cascade push-pull circuit, which form a dynamic automatic bias control circuit for eliminating the cross-over distortion of the power amplifiers together. The circuit is mainly used for an audio power amplifier or an electronic instrument.
Description
Technical field
The present invention relates to a kind of power amplifier without cross-over distortion, relate to a kind of circuit that is used to eliminate the intermodulation distortion of Class B audio-frequency power amplifier specifically.
Background technology
The OCL power amplifier is the power amplifier that the person of ordinary skill in the field knows, and the branch of Class A, Class B is arranged usually.B power amplifier is because quiescent current designs very for a short time, be generally 10～20mA, so when small-signal is exported, just produced switch distortion, thereby cause intermodulation distortion, deterioration tonequality, when power amplifier is worked in whole supply voltage scope, the switch distortion waveform does not appear in the power amplifier output, people have designed class a audio power amplifier, and the value of class a audio power amplifier quiescent current is normally pressed the setting of output load impedance RL value, but the loud speaker as the power amplifier load itself is not pure resistive just, therefore, and to high-fidelity loudspeaker, its impedance in the nominal operation frequency range of IEC standard code, must not be lower than 80% of rated impedance, promptly when output load RL got 8 Ω, its impedance in the nominal operation frequency range must not be lower than 6.4 Ω.This just means, when establishing the positive half cycle signal of input, when the crest voltage of output band frequency greater than monolateral power source voltage Vcc 80% the time, the switch distortion do not avoided has appearred in pure class a audio power amplifier, thereby causes intermodulation distortion.
Summary of the invention
The objective of the invention is for a kind of power amplifier without cross-over distortion is provided, it compared with prior art, the power amplifier end pipe that can make the OCL power amplifier is not in cut-off state all the time when symmetrical operation.
For achieving the above object, described power amplifier without cross-over distortion, it is characterized in that, between power amplifier constant voltage circuit and power amplifier Darlington push-pull circuit, connect the described intermodulation distortion main control circuit that disappears, when making constant voltage circuit dynamic under the effect of the intermodulation distortion main control circuit that disappears, by constant voltage control to final stage Darlington push-pull circuit, become autobias control to the final stage Darlington circuit, therefore the final stage Darlington circuit that has solved class a audio power amplifier and Class B power amplifier is controlled the quiescent dissipation of existence and the contradiction between the intermodulation distortion because of being subjected to constant voltage circuit.
Described power amplifier without cross-over distortion is tested, and its frequency range is with regard to intermodulation distortion, and by 1Hz～1MHz, (used signal source frequency range is 1Hz～1MHz), do not occur intermodulation distortion on the oscilloscope in the sinusoidal wave scope.
Description of drawings
The present invention will be illustrated by specific embodiments and the drawings, wherein:
The OCL power amplifier (Class A or Class B) of figure one expression prior art;
The embodiment circuit structure diagram of the described power amplifier without cross-over distortion of figure two expressions.
Embodiment
With reference to accompanying drawing, it is as follows to be described in detail specific embodiments of the present invention:
In figure one, circuit in the frame of broken lines 20 is a constant voltage circuit, circuit in the frame of broken lines 22 is three grades of Darlington cascade push-pull circuits, wherein, one of the collector electrode of first triode 1 and the 3rd resistance 3 is terminated on the base stage of the 11 triode 11, the emitter-base bandgap grading of the 11 triode 11 connects the base stage of the 12 triode 12, the emitter-base bandgap grading of the 12 triode 12 connects the base stage of the 13 triode 13, the emitter-base bandgap grading of the 13 triode 13 links by the 17 resistance 17 and the 19 load resistance 19, the 19 load resistance 19 other end ground connection, the collector electrode of second triode 2 is connected to respectively on the base stage of the 6th resistance 6 and the 14 triode 14, the emitter-base bandgap grading of the 14 triode 14 connects with the base stage of the 15 triode 15, the emitter-base bandgap grading of the 15 triode 15 connects with the base stage of the 16 triode 16, the emitter-base bandgap grading of the 16 triode 16 connects signal output parts 26 by the 18 resistance 18, and power amplifier positive supply 27 respectively with the 11 triode 11, the 12 triode 12, the collector electrode of 13 triodes 13 electrically connects; Putting negative supply 28 electrically connects with the collector electrode of the 14 triode the 14, the 15 triode 15,16 triodes 16 respectively, the other end of the 3rd resistance 3 connects the base stage of first triode 1, base stage and the base stage of second triode 2, the base stage of two triodes 2 that the 4th adjustable resistance 4 the 5th electric capacity 5 connects first triode 1 respectively connects an end of the 6th resistance 6, signal input part among the figure one is 23 and 24, number output is 26, the midpoint potential of constant voltage circuit is 25, and the current potential when it is static with signal output part 26 equates.
In figure one circuit, adjust the 4th adjustable resistance 4, can make the 13 triode 13 and the 16 triode 16 work in Class A or Class B state.
Figure two has provided a kind of circuit structure diagram of the concrete scheme of described power amplifier without cross-over distortion.Be the intermodulation distortion main control circuit that disappears among the figure in the frame of broken lines 21, it is made up of the 7th resistance 7, the 8th resistance 8, the 9th triode 9 and the tenth triode 10, when the 17 resistance the 17, the 18 resistance 18 in the 3rd resistance 3, the 6th resistance 6 and the frame of broken lines 22 in it and the frame of broken lines 20 links, just constituted complete no intermodulation distortion output circuit.Its concrete connecting mode is, the 7th resistance 7 connects with the base stage of first triode 1 and the emitter-base bandgap grading of the 9th triode 9 respectively, and the base stage of the 9th triode 9 connects with the 18 resistance 18, and the collector electrode of the 9th triode 9 connects with the base stage of the 14 triode 14; The 8th resistance 8 connects with the emitter-base bandgap grading of the base stage of second triode 2 and the tenth triode 10 respectively, the base stage of the tenth triode 10 connects with the 17 resistance 17, the collector electrode of the tenth triode 10 connects with the base stage of the 11 triode 11.
The operation principle of the power amplifier without cross-over distortion of figure two embodiment is described in detail as follows:
The stability of circuit working when static, signal output part 26 current potentials are OV, 25 current potential also is OV between the emitter-base bandgap grading of the emitter-base bandgap grading of first triode 1 and second triode 2, because the collector electrode of the 13 triode 13 and the collector current of the 16 triode 16 only are 5～10mA, so the 17 resistance 17, the voltage at the 18 resistance 18 two ends is about OV, therefore, the 9th triode 9, the base potential of the tenth triode 10 is OV, the 9th triode 9, the emitter potential of the tenth triode 10 equals first triode 1 respectively, the base potential of second triode 2, this shows, the 7th resistance 7, the voltage at the 8th resistance 8 two ends is minimum, so the 7th resistance 7,8 pairs the 3rd resistance 3 of the 8th resistance, the shunting action of the 6th resistance 6 is minimum, when variation of ambient temperature, the BE utmost point of first triode 1 has identical negative temperature coefficient with the BE utmost point (the BE utmost point of the BE utmost point of second triode 2 and the tenth triode 10) of the 9th triode 9, so voltage at two ends, the 7th resistance 7 two ends (the 8th resistance 8), basically can not change because of the variation of ambient temperature, so the 3rd resistance 3, the voltage at the 6th resistance 6 two ends is not because the access of the 9th triode 9 and the tenth triode 10 produces new destabilizing factor, though the 13 triode 13, the 16 triode 16 can be because the rising of temperature and cause the increase of quiescent current during work, but because of the 17 resistance 17, the resistance of the 18 resistance 18 is too little, so the 9th triode 9, the base potential of the tenth triode 10 changes and is not obvious, is good through this circuit thermal stability of long period of experiments.
In the time of dynamically, with signal output part 26 is the reference point of potential, if signal input part 23 is for just, the collector electrode of first triode 1, one end of the 3rd resistance 3 and three grades of Darlington cascade circuit constant amplitudes rise, at this moment, because the BE electrode potential of the 9th triode 9 is constant, so the base potential of first triode 1 is 1/2 of signal input part 23 dynamic electric voltage amplitudes, the base stage of second triode 2 equates with the base potential of first triode 1, because the rising and the 8th resistance 8 of the BE electrode potential of the 13 triode 13 emitter potential and the tenth triode 10, the series relationship of the 6th resistance 6, make the voltage at the 6th resistance 6 two ends increase 0.5 times of the 11 triode 11 base voltages, this has just compensated the amplitude that second triode 2 base potential rise, the base stage of the 14 triode 14 is still kept and signal output part 26 between former resting potential difference constant substantially.
If signal input part 24 is for negative, the collector electrode of second triode 2, one end of the 6th resistance 6 and three grades of Darlington cascade level circuit constant amplitudes descend, at this moment, because the BE electrode potential of the tenth triode 10 is constant, so the base potential of second triode 2 is 1/2 of signal input part 24 dynamic electric voltage amplitudes, the base stage of first triode 1 equates with the base potential of second triode 2, because the decline and the 7th resistance 7 of the BE electrode potential of the 16 triode 16 emitter potential and the 9th triode 9, the series relationship of the 3rd resistance 3, make the voltage at the 3rd resistance 3 two ends increase 0.5 times of the 14 triode 14 base voltages, this has just compensated the amplitude that first triode 1 base potential descends, the base stage of the 11 triode 11 is still kept and signal output part 26 between former resting potential difference constant substantially.
In the time of dynamically, because the collector electrode (collector electrode of the tenth triode 10) of the 9th triode 9 is lower than (being higher than) its base stage all the time, so described power amplifier without cross-over distortion, as long as enough big power supply capacity is arranged, the final stage power tube has enough big fan-out capability, even when the 19 load resistance 19 is decreased near zero ohm, still intermodulation distortion can not occur on the signal output part 26, therefore, this power amplifier is very wide to the accommodation that the output load resistance changes.
Claims (2)
1. power amplifier without cross-over distortion, contain constant voltage circuit (20), intermodulation distortion circuit (21) and three grades of Darlington cascade push-pull circuits (22) disappear, wherein, the collector electrode of first triode (1) and second resistance (3) thereof, upside Darlington cascade circuit (11,12,13), the 17 resistance (17) to signal output part (26) electrically connects in order, the collector electrode of second triode (2) and the 6th resistance (6) thereof, downside Darlington cascade circuit (14,15,16), the 18 resistance (18) to signal output part (26) electrically connects in order, link with the base stage of first triode (1) second triode (2) respectively after the 4th adjustable resistance (4) the 5th electric capacity (5) parallel connection, it is characterized in that, the described intermodulation distortion circuit (21) that disappears is connected with the emitter-base bandgap grading of the 3rd resistance (3) and the 9th triode (9) respectively by the 7th resistance (7), the base stage of the 9th triode (9) connects the 18 resistance (18) one ends, and the collector electrode of the 9th triode (9) connects with the base stage of the 14 triode (14); The 8th resistance (8) connects with the emitter-base bandgap grading of the 6th resistance (6) and the tenth triode (10) respectively, and the base stage of the tenth triode (10) connects the 17 resistance (17) one ends, and the collector electrode of the tenth triode (10) connects with the base stage of the 11 triode (11).
2. power amplifier without cross-over distortion according to claim 1, it is characterized in that, between power amplifier constant voltage circuit (20) and three grades of Darlington cascades of power amplifier push-pull circuit (22), connect the intermodulation distortion main control circuit (21) that disappears, when making constant voltage circuit dynamic under the effect of the intermodulation distortion control circuit that disappears, by constant voltage control, become autobias control to final stage Darlington push-pull circuit to final stage Darlington push-pull circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001259636A CN1175559C (en) | 2000-09-09 | 2000-09-09 | Power amplifier without cross-over distortion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001259636A CN1175559C (en) | 2000-09-09 | 2000-09-09 | Power amplifier without cross-over distortion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1343039A CN1343039A (en) | 2002-04-03 |
| CN1175559C true CN1175559C (en) | 2004-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001259636A Expired - Fee Related CN1175559C (en) | 2000-09-09 | 2000-09-09 | Power amplifier without cross-over distortion |
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| Country | Link |
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| CN (1) | CN1175559C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2602248C2 (en) * | 2011-01-28 | 2016-11-10 | Лафарж | Hydraulic binder with low clinker content |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6727758B2 (en) * | 2002-05-28 | 2004-04-27 | Koninklijke Philips Electronics N.V. | Fast cascaded class AB bipolar output stage |
| CN102801393B (en) * | 2011-05-22 | 2017-11-07 | 施少俊 | Conduction-switching type high-fidelity |
| CN110533966B (en) * | 2019-10-14 | 2021-03-19 | 郑州铁路职业技术学院 | Foreign language spoken language correction system |
-
2000
- 2000-09-09 CN CNB001259636A patent/CN1175559C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2602248C2 (en) * | 2011-01-28 | 2016-11-10 | Лафарж | Hydraulic binder with low clinker content |
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| Publication number | Publication date |
|---|---|
| CN1343039A (en) | 2002-04-03 |
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