CN2324704Y - Energy amplifier final-current amplifier - Google Patents
Energy amplifier final-current amplifier Download PDFInfo
- Publication number
- CN2324704Y CN2324704Y CN 97205669 CN97205669U CN2324704Y CN 2324704 Y CN2324704 Y CN 2324704Y CN 97205669 CN97205669 CN 97205669 CN 97205669 U CN97205669 U CN 97205669U CN 2324704 Y CN2324704 Y CN 2324704Y
- Authority
- CN
- China
- Prior art keywords
- emitter
- current
- power supply
- meets
- base stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a final current amplifier of an energy amplifier, which mainly relates to a signal input end, a signal output end and operating currents. The utility model is characterized in that the signal input end is connected with the base plates of a V1 and a V2, the collector electrodes of the V1 and a V4 is connected with a power source V[+], the V2 and a V3 is connected with the power source V [-], the emitter electrode of the V1 is connected with the base electrode V4, the emitter electrode of the V2 is connected with the base electrode V3, the emitter electrodes of the V3 and the V4 are connected in parallel with the signal output end, and a constant current source A which provides quiescent current for the V1, the V4, the V2 and the V3, is respectively connected among the emitter electrodes of the V1 and the V2 and the power source. The circuit has a static biasing high stability, the damping coefficient of the complete machine can be raised, crossover distortion can be lowered, and the utility model has a favorable linear response, etc.
Description
The utility model relates to a kind of final stage current-amplifying device that is used for power amplifier.
The biasing Chang Yin of conventional power amplifier final stage current-amplifying device is subjected to the influence of variation of ambient temperature to cause the instability of circuit, and the linearity of signal output is also good inadequately.
The purpose of this utility model is that design a kind ofly can overcome the deficiencies in the prior art, can not influence the power amplifier final stage current-amplifying device of quiescent current because of variations in temperature.
The utility model is achieved in that
A kind of power amplifier final stage current-amplifying device relates to signal input part, signal output part and working power, it is characterized in that signal input part meets V
1, V
2Base stage, V
1, V
3Collector electrode meets power supply one utmost point (V
+), V
2, V
4Collector electrode meets another level of power supply (V
-), V
1Emitter meets V
4Base stage, V
2Emitter meets V
3Base stage, V
3, V
4Emitter be parallel to signal output part, and at V
1Emitter and power supply (V
-) between and V
2Emitter and power supply (V
+) between all be connected to circuit A.
Further scheme is that described circuit A can be a resistance, also can be constant-current source.
Further scheme is, constant-current source relates to resistance R
3, R
4, voltage stabilizing didoe V
5With triode V
6, and R
3An end and V
6Collector electrode connect power supply, R
3The other end and V
5A termination V
6Base stage, R
4One termination V
6Emitter, the other end and V
5Other end parallel connection after be connected to V
1(or V
2) emitter.
Further scheme is V again
3, V
4Base stage also be in series with resistance R respectively
1, R
2
The utility model has the advantages that:
1, the high stability of quiescent biasing.The quiescent biasing of this circuit is fully by front stage transistor V
1, V
2Provide, and the same material transistor is in equivalent environment temperatures drop characteristic unanimity.
2, reduce intermodulation distortion, improved energy utilization rate.This circuit only is to promote level V
1, V
2Be operated in pure Class A (full conducting) state, and final stage V
3, V
4Real work is at Class B (initial conducting state) state, as long as V
1, V
2, V
3, V
4All selecting silicone tube or germanium tube for use, will avoid intermodulation distortion in theory, is that promotion level and the final stage of avoiding intermodulation distortion to take all is operated in class AB or the measure of Class A full when not needing the constant voltage mode that static state is provided.
3, higher damping coefficient.Constant-current source provides the quiescent biasing mode to guarantee the reliability of final stage work, so do not need series limiting resistor (this resistance can increase the output internal resistance of final stage) on its emitter, so can improve the damping coefficient of complete machine to greatest extent, so that promote load like a cork.
4, excellent linear response.In this circuit, when promoting level by static dot-dash during to cut-off region, final stage then by by zoning to the service area, the variation of both operating currents is just in time opposite, so the β value after multiplying each other just tends towards stability, so signal is exported favorable linearity is arranged.
5, reduced the requirement of selection pairing property.Adopt the final stage pipe (the promotion pipe of PNP polarity promotes the final stage pipe of NPN polarity) of the promotion pipe promotion PNP polarity of NPN polarity to need only the two not damage own, just can not make mid point output produce drift, cause that the direct current to loud speaker impacts, and also insensitive such as parameters such as multiplication factors to other, circuit is equally reliable and stable.
Fig. 1 is a circuit diagram of the present utility model.
Fig. 2 is the circuit diagram of constant-current source of the present utility model.
Below in conjunction with accompanying drawing the utility model is described further.
As Fig. 1, a kind of power amplifier final stage current-amplifying device relates to signal input part in, output out and working power, and wherein in meets V
1, V
2Base stage, V
1, V
3Collector electrode meets power supply V
+, V
2, V
4Collector electrode meets power supply V
-, V
1Emitter passes through R
4Meet V
4Base stage, V
2Emitter passes through R
3Meet V
3Base stage, V
3, V
4The emitter parallel connection be connected to output out, at V
1Emitter and power supply V
-Between and V
2Emitter and power supply V
+Between also be connected to constant-current source A.
As Fig. 2, constant-current source is by resistance R
3, R
4, voltage stabilizing didoe V
5With triode V
3Constitute, and R
3An end and V
6Collector electrode meet power supply V
+(or V
-), R
3The other end and V
5A termination V
6Base stage, R
4One termination V
6Emitter, the other end and V
5Other end parallel connection after be connected to V
1(or V
2) emitter.
When static circuit was stablized, 2 of A, B were " zero potential ", V
3, V
4Be in critical conduction mode, V
1, V
2Be in conducting state, the electric current of constant-current source almost all has been added in V
1, V
2Emitter on, so whole operating state is V
1, V
2Be operated in Class A (full conducting) state, V
3, V
4Be operated in Class B (initial conducting) state.V
3, V
4The maximum current fan-out capability by the decision of the current rating of constant-current source.By adjusting R
4Resistance, can change the constant current value of constant-current source.
In the time of dynamically, if the input waveform is in negative half period, V
1Electric current from static dot-dash to cut-off region, and V
4Then from ending zoning to the amplification region, both just in time change in the opposite direction, have played favorable linearity and have remedied effect; Next interim when the signal lower half, the amplification task is then by V
2, V
3Finish, at positive half cycle signal of final stage output.So just finished the amplification task of signal gamut.
If need further to improve the circuit fan-out capability, reduce damping coefficient, but this circuit two-stage or plural parallel stage work.
Claims (4)
1, a kind of power amplifier final stage current-amplifying device relates to signal input part, signal output part and working power, it is characterized in that signal input part meets V
1, V
2Base stage, V
1, V
3Collector electrode meets power supply one utmost point (V
+), V
2, V
4Collector electrode meets another level of power supply (V
-), V
1Emitter meets V
4Base stage, V
2Emitter meets V
3Base stage, V
3, V
4Emitter be parallel to signal output part, and at V
1Emitter and power supply (V
-) between and V
2Emitter and power supply (V
+) between all be connected to circuit A.
2, power amplifier final stage current-amplifying device according to claim 1 is characterized in that described circuit A can be a resistance, also can be constant-current source.
3, power amplifier final stage current-amplifying device according to claim 2 is characterized in that constant-current source relates to resistance R
3, R
4, voltage stabilizing didoe V
5With triode V
6, and R
3An end and V
6Collector electrode connect power supply, R
3The other end and V
5A termination V
6Base stage, R
4One termination V
6Emitter, the other end and V
5Other end parallel connection after be connected to V
1(or V
2) emitter.
4, power amplifier final stage current-amplifying device according to claim 1 is characterized in that V
3, V
4Base stage also be in series with resistance R respectively
1, R
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97205669 CN2324704Y (en) | 1997-12-23 | 1997-12-23 | Energy amplifier final-current amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97205669 CN2324704Y (en) | 1997-12-23 | 1997-12-23 | Energy amplifier final-current amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2324704Y true CN2324704Y (en) | 1999-06-16 |
Family
ID=33925851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97205669 Expired - Fee Related CN2324704Y (en) | 1997-12-23 | 1997-12-23 | Energy amplifier final-current amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2324704Y (en) |
-
1997
- 1997-12-23 CN CN 97205669 patent/CN2324704Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |