CN1168204C - Dynamicaly synchronous voltage-biased power amplifier - Google Patents
Dynamicaly synchronous voltage-biased power amplifier Download PDFInfo
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- CN1168204C CN1168204C CNB001265156A CN00126515A CN1168204C CN 1168204 C CN1168204 C CN 1168204C CN B001265156 A CNB001265156 A CN B001265156A CN 00126515 A CN00126515 A CN 00126515A CN 1168204 C CN1168204 C CN 1168204C
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 17
- 230000000694 effects Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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Abstract
The present invention relates to a dynamically synchronous voltage-biased power amplifier, particularly to a circuit for eliminating the cross-over distortion of a secondary power amplifier. The circuit for eliminating the cross-over distortion of the power amplifier is composed of a constant voltage circuit, a dynamically synchronous voltage-biased circuit and a three-level Darlington cascade connection push-pull circuit. If a power supply has enough volumetric capacity, a last level power tube has enough output capacity. The power amplifier can not generate the cross-over distortion phenomenon under the condition of full-load output when load resistance is approached to short circuit. The circuit can be used for an audio power amplifier, a high-frequency power amplifier or an electronic device.
Description
Technical field
The present invention relates to a kind of Dynamicaly synchronous voltage-biased power amplifier, relate to a kind of circuit that is used to eliminate Class B power amplification intermodulation distortion 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 10～50mA, so when small-signal is exported, just produced switch distortion, thereby caused intermodulation distortion, 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 purpose that also promptly designs class a audio power amplifier only is to eliminate switch distortion, and the cost of for this reason paying is, to consume quiescent current at full capacity, exchange the output waveform of no switch distortion for.
Summary of the invention
The objective of the invention is for a kind of Dynamicaly synchronous voltage-biased power amplifier 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, the invention provides a kind of Dynamicaly synchronous voltage-biased power amplifier, contain power amplifier constant voltage circuit 28, dynamic synchronization voltage offset electric circuit 29 and three grades of Darlington cascades of power amplifier push-pull circuit 30, between described power amplifier constant voltage circuit 28 and three grades of Darlington cascades of the described power amplifier push-pull circuit 30, connect described dynamic synchronization voltage offset electric circuit 29, when making described power amplifier constant voltage circuit 28 dynamically, under the effect of described dynamic synchronization voltage offset electric circuit 29, by constant voltage control to three grades of Darlington cascades of described power amplifier push-pull circuit 30, become dynamic synchronization voltage bias to three grades of Darlington cascades of described power amplifier push-pull circuit, to obtain the output waveform of no intermodulation distortion, wherein, the collector electrode of first triode 1 in the described power amplifier constant voltage circuit and the 3rd biasing resistor 3 thereof, the 15 triode 15 in three grades of Darlington cascades of power amplifier push-pull circuit 30, the 16 triode 16, the 17 triode 17, the 21 resistance 21 and signal output part 27 are linked in sequence; The collector electrode of second triode 2 in the described power amplifier constant voltage circuit and the 6th biasing resistor 6 thereof, the 18 triode 18 in three grades of Darlington cascades of power amplifier push-pull circuit 30, the 19 triode 19, the 20 triode 20, the 22 resistance 22 and signal output part 27, be linked in sequence, the 4th adjustable resistance 4 in the described power amplifier constant voltage circuit 28, after 5 parallel connections of the 5th electric capacity, respectively with described first triode 1, the base stage of second triode 2 links to each other, it is characterized in that: in described dynamic synchronization voltage offset electric circuit 29, connect the base stage of described first triode 1 by the emitter-base bandgap grading of the 7th triode 7, the collector electrode of the 7th triode 7 connects the collector electrode of described second triode 2, the base stage of the 7th triode 7 connects the positive pole of the 9th diode 9 and an end of the 13 resistance 13; The base stage that the collector electrode that connects base stage, the 8th triode 8 of described second triode 2 by the emitter-base bandgap grading of the 8th triode 8 connects the collector electrode of described first triode 1, the 8th triode 8 connects the negative pole of the tenth diode 10 and an end of the 14 resistance 14, and the positive pole of the negative pole of the 9th diode 9 and the tenth diode 10 connects signal output part 27.
Because described dynamic synchronization voltage offset electric circuit has adopted common-base circuit, so this circuit is more suitable for high frequency power amplifier is carried out the dynamic synchronization bias voltage comparatively speaking, to solve the intermodulation distortion problem of high frequency power amplifier, described dynamic synchronization voltage offset electric circuit also can be used for being mixed in the OCL power amplifier that constitutes by amplifier, triode.
Described Dynamicaly synchronous voltage-biased power amplifier, the tested person instrument limits only to 1Hz～30MHz, and sine wave detects, and its frequency range by 1Hz～30MHz, in the sinusoidal wave scope, intermodulation distortion do not occur on the oscilloscope with regard to intermodulation distortion.
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 figure two expressions Dynamicaly synchronous voltage-biased power amplifier of the present invention.
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, circuit in the frame of broken lines 28 is described power amplifier constant voltage circuit, circuit in the frame of broken lines 30 is three grades of Darlington cascades of described power amplifier push-pull circuit, one of the collector electrode of first triode 1 and the 3rd resistance 3 is terminated on the base stage of the 15 triode 15, the emitter-base bandgap grading of the 15 triode 15 connects the base stage of the 16 triode 16, the emitter-base bandgap grading of the 16 triode 16 connects the base stage of the 17 triode 17, the emitter-base bandgap grading of the 17 triode 17 links to each other with the 23 load resistance 23 by the 21 resistance 21, the 23 load resistance 23 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 18 triode 18, the emitter-base bandgap grading of the 18 triode 18 is connected with the base stage of the 19 triode 19, the emitter-base bandgap grading of the 19 triode 19 is connected with the base stage of the 20 triode 20, the emitter-base bandgap grading of the 20 triode 20 connects signal output part 27 by the 22 resistance 22, one end of the 3rd resistance 3 connects the base stage of first triode 1, the 4th adjustable resistance 4, the 5th electric capacity 5 connects the base stage of first triode 1 and the base stage of second triode 2 respectively, the base stage of second triode 2 connects an end of the 6th resistance 6, the other end of the 6th resistance 6 links to each other with the collector electrode of second triode 2, signal input part among the figure one is 24 and 25, signal output part is 27, the midpoint potential of described power amplifier constant voltage circuit is 26, and the current potential when it is static with signal output part 27 equates.
In figure one circuit, adjust the 4th adjustable resistance 4 and can make the 17 triode 17 and the 20 triode 20 work in Class A or Class B state.
Figure two has provided a kind of circuit structure diagram of the concrete scheme of described Dynamicaly synchronous voltage-biased power amplifier.Be described dynamic synchronization voltage offset electric circuit among the figure in the frame of broken lines 29, it is by the 7th triode 7, the 8th triode 8, the 9th diode 9, the tenth diode 10 and the 11 electric capacity 11, the 12 electric capacity 12 is formed, the 3rd resistance 3 in it and frame of broken lines 28, the 13 resistance 13 in the 6th resistance 6 and the frame of broken lines 30, when the 14 resistance 14 links to each other, just constituted complete dynamic synchronization voltage offset electric circuit, its concrete connected mode is that the base stage of first triode 1 is connected with the emitter-base bandgap grading of the 7th triode 7, the base stage of the 7th triode 7 respectively with the 9th diode 9, the 11 electric capacity 11, one end of the 13 resistance 13 links to each other, the 9th diode 9, the other end of the 11 electric capacity 11 connects signal output part 27, the other end of the 13 resistance 13 links to each other with the emitter-base bandgap grading of the 15 triode 15, the collector electrode of the 7th triode 7 is connected with the base stage of the 18 triode 18; The other end that the base stage of second triode 2 is connected with the emitter of the 8th triode 8, the base stage of the 8th triode 8 links to each other with an end of the tenth diode the 10, the 12 electric capacity 12 and the 14 resistance 14 respectively, the other end of the tenth diode 10, the 12 electric capacity 12 is connected signal output part 27, the 14 resistance 14 links to each other with the emitter-base bandgap grading of the 18 triode 18, the collector electrode of the 8th triode 8 links to each other with the base stage of the 15 triode 15.
The operation principle of the described Dynamicaly synchronous voltage-biased power amplifier of figure two embodiment is described in detail as follows.
When static, the stability of circuit working: signal output part 27 voltage to earths are 0V, 26 current potential also is 0V between first triode 1 and second triode, 2 emitters, promptly the BE utmost point of the first triode 1 BE utmost point that equals the 7th triode 7 adds the PN junction of the 9th diode 9, because the emitter-base bandgap grading at the 7th triode 7 is connected to the 3rd resistance 3, be in little logical or critical cut-off state so must control the 7th triode 7, to avoid that the 3rd resistance 3 is produced shunting significantly, when the 11 diode 11 usefulness germanium tubes, just can function as described above.When ambient temperature raises, in figure two circuit, first triode 1 in the described power amplifier constant voltage circuit 28, the variable quantity that the BE of second triode 2 knot negative temperature coefficient variable quantity is reacted to whole constant-voltage control circuit is equivalent to the variable quantity of the negative temperature coefficient of 6 BE junction voltages, and the 7th triode 7 in the described dynamic synchronization voltage offset electric circuit 29 (the 8th triode 8), the PN junction summation of the 15 triode 15 (the 18 triode 18) in the 9th diode 9 (the tenth diode 10) and the described three grades of Darlington cascade circuit also is equivalent to the summation of 6 BE knots, so its negative temperature coefficient equates with described power amplifier constant voltage circuit 28, the stability when therefore the access of described dynamic synchronization voltage offset electric circuit can not influence figure two circuit quiescent operations.
The course of work in the time of dynamically: when signal input part 24 signals are timing, one end the 15 triode 15 of the 3rd resistance 3～the 17 triode 17 current potentials rise, and provide electric current to the 23 resistance 23 by the 21 resistance 21, the 21 resistance 21 both end voltage are increased, synchronous signal output 27 current potentials rise, because the base stage of the 7th triode 7 is subjected to the 9th diode 9 clampers, make the emitter-base bandgap grading of the 7th triode 7 dynamically the time, still keep equating substantially with the current potential of signal output part 27, at this moment, the voltage amplification at the 3rd resistance 3 two ends will be synchronous with the base voltage of upper arm Darlington circuit input the 15 triode 15, because the 4th adjustable resistance 4 both end voltage are constant, so keep former quiescent value constant between the 8th triode 8 emitter-base bandgap gradings and the signal output 27, the 6th resistance 6 both end voltage are constant, so the 18 triode 18～the 20 triode 20 has kept and signal output part 27 between former quiescent value constant, promptly whole underarm Darlington circuit still is in not cut-off state when positive half cycle signal.The frequency response speed of as seen described dynamic synchronization voltage offset electric circuit to setting up the voltage at the 3rd resistance 3 two ends fast, has played key effect.
When signal input part 25 signals when negative, one end the 18 triode 18 of the 6th resistance 6～the 20 triode 20 current potentials descend, and provide electric current to 22 resistance 22 by the 23 resistance 23, the 22 resistance 22 both end voltage are increased, synchronous signal output 27 current potentials descend, because the base stage of the 8th triode 8 is subjected to the tenth diode 10 clampers, make the emitter-base bandgap grading of the 8th triode 8 dynamically the time, still keep equating substantially with the current potential of signal output part 27, at this moment, the voltage amplification at the 6th resistance 6 two ends will be synchronous with the base voltage of underarm Darlington circuit input the 18 triode 18, because the 4th adjustable resistance 4 both end voltage are constant, so keep former quiescent value constant between the 7th triode 7 emitter-base bandgap gradings and the signal output 27, the 3rd resistance 3 both end voltage are constant, so the 15 triode 15～the 17 triode 17 has kept and signal output part 27 between former quiescent value constant, promptly whole upper arm Darlington circuit still is in not cut-off state when negative half-cycle signal.
When figure two circuit are used for the high frequency power amplification, the available hyperfrequency low power tube of the 7th triode 7 (the 8th triode 8), the available germanium high frequency low-power diode of the 9th diode 9 (the tenth diode 10).
In the time of dynamically, because the collector electrode (collector electrode of the 8th triode 8) of the 7th triode 7 is lower than (being higher than) its base stage all the time, so described Dynamicaly synchronous voltage-biased power amplifier, as long as enough big power supply capacity is arranged, the final stage power tube has enough big fan-out capability, even when the 23 load resistance 23 is decreased near zero ohm, still intermodulation distortion can not occur on the signal output part 27.Therefore, this power amplifier is very wide to the accommodation that the output load resistance changes.
Claims (1)
1. Dynamicaly synchronous voltage-biased power amplifier, contain power amplifier constant voltage circuit (28), dynamic synchronization voltage offset electric circuit (29) and three grades of Darlington cascades of power amplifier push-pull circuit (30), between described power amplifier constant voltage circuit (28) and three grades of Darlington cascades of the described power amplifier push-pull circuit (30), connect described dynamic synchronization voltage offset electric circuit (29), when making described power amplifier constant voltage circuit (28) dynamically, under the effect of described dynamic synchronization voltage offset electric circuit (29), by constant voltage control to described power amplifier three grades of Darlington cascades push-pull circuit (30), become dynamic synchronization voltage bias to three grades of Darlington cascades of described power amplifier push-pull circuit, to obtain the output waveform of no intermodulation distortion, wherein, the collector electrode of first triode (1) in the described power amplifier constant voltage circuit and the 3rd biasing resistor (3) thereof, the 15 triode (15) in three grades of Darlington cascades of power amplifier push-pull circuit (30), the 16 triode (16), the 17 triode (17), the 21 resistance (21) and signal output part (27) are linked in sequence; The collector electrode of second triode (2) in the described power amplifier constant voltage circuit and the 6th biasing resistor (6) thereof, the 18 triode (18) in three grades of Darlington cascades of power amplifier push-pull circuit (30), the 19 triode (19), the 20 triode (20), the 22 resistance (22) and signal output part (27), be linked in sequence, the 4th adjustable resistance (4) in the described power amplifier constant voltage circuit (28), after the 5th electric capacity (5) parallel connection, respectively with described first triode (1), the base stage of second triode (2) links to each other, it is characterized in that: in described dynamic synchronization voltage offset electric circuit (29), connect the base stage of described first triode (1) by the emitter-base bandgap grading of the 7th triode (7), the collector electrode of the 7th triode (7) connects the collector electrode of described second triode (2), the base stage of the 7th triode (7) connects the positive pole of the 9th diode (9) and an end of the 13 resistance (13); The base stage that the collector electrode that connects base stage, the 8th triode (8) of described second triode (2) by the emitter-base bandgap grading of the 8th triode (8) connects the collector electrode of described first triode (1), the 8th triode (8) connects the negative pole of the tenth diode (10) and an end of the 14 resistance (14), and the positive pole of the negative pole of the 9th diode (9) and the tenth diode (10) connects signal output part (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001265156A CN1168204C (en) | 2000-09-09 | 2000-09-09 | Dynamicaly synchronous voltage-biased power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001265156A CN1168204C (en) | 2000-09-09 | 2000-09-09 | Dynamicaly synchronous voltage-biased power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1343040A CN1343040A (en) | 2002-04-03 |
| CN1168204C true CN1168204C (en) | 2004-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001265156A Expired - Fee Related CN1168204C (en) | 2000-09-09 | 2000-09-09 | Dynamicaly synchronous voltage-biased power amplifier |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801393B (en) * | 2011-05-22 | 2017-11-07 | 施少俊 | Conduction-switching type high-fidelity |
| US9679869B2 (en) | 2011-09-02 | 2017-06-13 | Skyworks Solutions, Inc. | Transmission line for high performance radio frequency applications |
| EP3567629A3 (en) | 2012-06-14 | 2020-01-22 | Skyworks Solutions, Inc. | Power amplifier modules including related systems, devices, and methods |
| WO2013188694A1 (en) | 2012-06-14 | 2013-12-19 | Skyworks Solutions, Inc. | Process-compensated hbt power amplifier bias circuits and methods |
| CN109982205B (en) * | 2019-04-30 | 2023-11-21 | 先歌国际影音股份有限公司 | Low-power amplifier dynamic bias circuit |
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| CN1343040A (en) | 2002-04-03 |
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