CN209676461U - A kind of small-power power amplifier dynamic bias circuit - Google Patents
A kind of small-power power amplifier dynamic bias circuit Download PDFInfo
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- CN209676461U CN209676461U CN201920624663.9U CN201920624663U CN209676461U CN 209676461 U CN209676461 U CN 209676461U CN 201920624663 U CN201920624663 U CN 201920624663U CN 209676461 U CN209676461 U CN 209676461U
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Abstract
The utility model provides a kind of small-power power amplifier dynamic bias circuit, belongs to power amplifier field.The utility model includes power supply, low-pass filter circuit, operational amplifier, mirror-image constant flow source, triode complementary push-pull output circuit, wherein, the input terminal of the operational amplifier is connected with the output end of low-pass filter circuit, the output end of the operational amplifier is connected with the input terminal of triode complementary push-pull output circuit, the triode complementary push-pull output circuit is connected with mirror-image constant flow source, and the power supply is the operational amplifier, mirror-image constant flow source, triode complementary push-pull output circuit provide supply voltage.The utility model has the following beneficial effects: the audio frequency apparatus distortion factor can be made low, conversion rate is high, and output impedance is low and pushes electric current big.
Description
Technical field
The utility model relates to a kind of power amplifier structure more particularly to a kind of small-power power amplifier dynamic bias circuits.
Background technique
General audio backing system DAC buffer output stage, pre-amplifier, the small-power that Earphone Amplifier uses
In the output of simulated power amplifier complementary push-pull, biasing circuit plays very important effect.It determines the work of amplifier
State, and largely influence the distortion and stabilization of output stage.
Generally quiescent bias circuit at present, quiescent biasing refer to provided for output stage it is fixed not with input signal or defeated
The biasing that signal changes out.This biasing circuit is most commonly that constant pressure biasing circuit, as shown in Figure 1.Wherein Fig. 1 is to utilize two
The forward voltage drop of pole pipe obtains bias, because bias cannot accurately adjust and internal resistance is larger, using being restricted.
Utility model content
To solve the problems of the prior art, the utility model provides a kind of small-power power amplifier dynamic bias circuit.
The utility model includes power supply, low-pass filter circuit, operational amplifier, mirror-image constant flow source, triode complementary push-pull
Output circuit, wherein the input terminal of the operational amplifier is connected with the output end of low-pass filter circuit, the operational amplifier
Output end be connected with the input terminal of triode complementary push-pull output circuit, the triode complementary push-pull output circuit and mirror image
Constant-current source is connected, and the power supply is the operational amplifier, mirror-image constant flow source, triode complementary push-pull output circuit provide power supply
Voltage.
The utility model is further improved, and further includes direct current biasing zeroing circuit, wherein the direct current biasing zeroing electricity
The input terminal on road is connected with power output end, the output end of the direct current biasing zeroing circuit and the power input of operational amplifier
End is connected.
The utility model is further improved, and the direct current biasing zeroing circuit includes resistance R4 and adjustable resistance VR1, fortune
Calculating amplifier OPAMP includes 8 pins, wherein pin 2 is inverting input terminal, and pin 3 is normal phase input end, and pin 6 is output
End, pin 4 are power ground end, and pin 5,1,7,8 is power pins, one end of the adjustable resistance VR1 and operational amplifier
The power pins 1 of OPAMP are connected, and the other end of the adjustable resistance VR1 is connected with the power pins 8 of operational amplifier OPAMP,
The adjustable end of the adjustable resistance VR1 is connected with one end of the resistance R4, the other end and negative power supply-of the resistance R4
VACC is connected, and the pin 7 of the operational amplifier OPAMP connects cathode power supply+VACC, the power pins 5 of operational amplifier OPAMP
Suspension.
The utility model is further improved, and further includes high frequency compensation, the input terminal of the high frequency compensation with
The output end of triode complementary push-pull output circuit is connected.
The utility model is further improved, and the high frequency compensation includes resistance R16 and capacitor C5, the resistance
After R16 and capacitor C5 series connection, one end is connected with the output end of triode complementary push-pull output circuit, other end ground connection.
The utility model is further improved, and the low-pass filter circuit includes resistance R5, resistance R9, resistance R14, resistance
R17, capacitor C3, capacitor C4, capacitor C1, wherein the first input signal DAC L- passes through resistance R9's and operational amplifier OPAMP
Inverting input terminal is connected, and the second input signal DAC L+ passes through the normal phase input end of resistance R14 and operational amplifier OPAMP
Be connected, the resistance R5 and capacitor C1 it is in parallel after one end be connected with the inverting input terminal of operational amplifier OPAMP, the other end and three
Pole pipe complementary push-pull output circuit output end is connected, one end of the capacitor C3 and the second input signal DAC L+ output end phase
Even, one end of the resistance R17 and capacitor C4 is connected with the normal phase input end of operational amplifier OPAMP, the capacitor C3, resistance
The other end of R17 and capacitor C4 are grounded respectively.
The utility model is further improved, and the triode complementary push-pull output circuit is staggered form diamond circuit.
The utility model is further improved, and further includes the detection detected to the electric current of the staggered form diamond circuit
Circuit, wherein the staggered form diamond circuit includes triode Q6, triode Q4, triode Q7, triode Q10, the detection
Circuit includes that the base stage of triode Q13, triode Q14, resistance 7 and resistance R24, the triode Q6 and triode Q7 are led to respectively
Resistance R12 is crossed to be connected with the output end of operational amplifier, the emitter of the triode Q6 respectively with mirror-image constant flow source input terminal,
The base stage of triode Q4 is connected with the collector of triode Q13, collector and the negative power supply-VACC phase of the triode Q6
Even, the collector of the triode Q4 is connected with cathode power supply+VACC, and the transmitting extremely output end of the triode Q4 is described
The base stage of triode Q13 and a termination mirror-image constant flow source output end of resistance R7, the emitter and resistance R7 of the triode Q13
The other end connect the other end of the emitter and resistance R24 that are followed by the triode Q14, the emitter point of the triode Q7
It is not connected with the collector of mirror-image constant flow source input terminal, the base stage of triode Q10 and triode Q14, the collection of the triode Q7
Electrode is connected with cathode power supply+VACC, and the collector of the triode Q10 is connected with negative power supply-VACC, the triode
The transmitting of Q10 extremely output end, the base stage of the triode Q14 and a termination mirror-image constant flow source output end of resistance R24.
The utility model is further improved, and the small-power power amplifier dynamic bias circuit further includes being arranged in the intersection
Formula diamond circuit output end, respectively to the current foldback circuit of triode Q4 and triode QI0 overcurrent protection, the overcurrent protection
Circuit includes switching diode D1, triode Q5, triode Q8, resistance R8 and resistance R15, wherein the switching diode
End is connected with the emitter of the emitter of triode Q5 and triode Q8 respectively altogether, other two pin of the switching diode
It is connected respectively by resistance R12 with the output end of operational amplifier, the collector of the triode Q5 and the base stage of triode Q4
It is connected, the base stage of the triode Q5 is connected with one end of the emitter of triode Q4 and resistance R8 respectively, the resistance R8's
The other end is output end, and the collector of the triode Q8 is connected with the base stage of triode Q10, the base stage point of the triode Q8
It is not connected with one end of the emitter of triode Q10 and resistance R15, the other end of the resistance R15 is output end.
The utility model is further improved, and the mirror-image constant flow source includes triode Q3, triode Q9, resistance R2, electricity
Hindering R3, resistance R18 and resistance R19, wherein the triode Q3 includes the triode Q3-A and triode Q3-B of base stage docking,
The triode Q9 includes triode Q9-A and triode Q9-B, the collector of the triode Q3-A and three poles of base stage docking
The emitter of pipe Q6 is connected, and emitter meets cathode power supply+VACC by resistance R3, the collector of the triode Q3-B respectively with
Base stage is connected with the base stage of triode Q13, and emitter connects cathode power supply+VACC, the collection of the triode Q9-A by resistance R2
Electrode is connected with the emitter of triode Q7, and emitter meets negative power supply-VACC by resistance R19, the triode Q9-B's
Collector is connected with the base stage of base stage and triode Q14 respectively, and emitter meets negative power supply-VACC by resistance R18.
Compared with prior art, the utility model has the beneficial effects that the audio frequency apparatus distortion factor can be made low, conversion rate
Height, output impedance is low and pushes electric current big.
Detailed description of the invention
Fig. 1 is prior art biasing circuit schematic diagram；
Fig. 2 is the utility model circuit block diagram；
Fig. 3 is the utility model circuit diagram.
Specific embodiment
The utility model is described in further details with reference to the accompanying drawings and examples.
As shown in Fig. 2, the utility model uses dynamic bias circuit, i.e. output stage quiescent current becomes with the variation of output
Change.For improving the switch distortion of quiescent bias circuit and the efficiency of power amplifier.Circuit framework is amplified by low noise operational
Device adds middle pliotron complementary push-pull to export.
Specifically, the utility model includes that power supply, low-pass filter circuit, operational amplifier, mirror-image constant flow source, triode are mutual
Mend push-pull output circuit, wherein the input terminal of the operational amplifier is connected with the output end of low-pass filter circuit, the operation
The output end of amplifier is connected with the input terminal of triode complementary push-pull output circuit, the triode complementary push-pull output circuit
It is connected with mirror-image constant flow source, the power supply is the operational amplifier, mirror-image constant flow source, triode complementary push-pull output circuit mention
Power supply source voltage.Further include direct current biasing zeroing circuit, adjusts the DC voltage of operational amplifier output terminal.Wherein, described straight
The input terminal of stream biasing zeroing circuit is connected with power output end, the output end and operation amplifier of the direct current biasing zeroing circuit
The power input of device is connected.
Preferably, further include high frequency compensation, prevent triode Q4 and triode Q10 output stage high-frequency self-excitation.It is described
The input terminal of high frequency compensation is connected with the output end of triode complementary push-pull output circuit.
As described in Figure 3, the direct current biasing zeroing circuit includes resistance R4 and adjustable resistance VR1, operational amplifier OPAMP
Including 8 pins, wherein pin 2 is inverting input terminal, and pin 3 is normal phase input end, and pin 6 is output end, and pin 4 is electricity
Source ground terminal, pin 5,1,7,8 are power pins, and one end of the adjustable resistance VR1 and the power supply of operational amplifier OPAMP draw
Foot 1 is connected, and the other end of the adjustable resistance VR1 is connected with the power pins 8 of operational amplifier OPAMP, the adjustable resistance
The adjustable end of VR1 is connected with one end of the resistance R4, and the other end of the resistance R4 is connected with negative power supply-VACC, described
The pin 7 of operational amplifier OPAMP meets cathode power supply+VACC, and the power pins 5 of operational amplifier OPAMP suspend.
The high frequency compensation include resistance R16 and capacitor C5, the resistance R16 and capacitor C5 series connection after, one end with
The output end of triode complementary push-pull output circuit is connected, other end ground connection.
The low-pass filter circuit includes resistance R5, resistance R9, resistance R14, resistance R17, capacitor C3, capacitor C4, capacitor
C1, wherein the first input signal DAC L- is connected by resistance R9 with the inverting input terminal of operational amplifier OPAMP, and described the
Two input signal DAC L+ are connected by resistance R14 with the normal phase input end of operational amplifier OPAMP, the resistance R5 and capacitor
One end is connected with the inverting input terminal of operational amplifier OPAMP after C1 is in parallel, the other end and triode complementary push-pull output circuit
Output end is connected, and one end of the capacitor C3 is connected with the second input signal DAC L+ output end, the resistance R17 and capacitor C4
One end be connected with the normal phase input end of operational amplifier OPAMP, the other end of the capacitor C3, resistance R17 and capacitor C4 point
It is not grounded.
The triode complementary push-pull output circuit of this example is staggered form diamond circuit.The utility model further includes to the friendship
The detection circuit that the electric current of V shape diamond circuit is detected, wherein the staggered form diamond circuit includes triode Q6, three poles
Pipe Q4, triode Q7, triode Q10, the detection circuit include triode Q13, triode Q14, resistance 7 and resistance R24, institute
State triode Q13 and resistance R7 be staggered form diamond circuit input negative half period when electric current increase detection circuit, described three
The detection circuit that electric current increases when pole pipe Q14 and resistance R24 is staggered form diamond circuit input positive half cycle.
In this example, the base stage of the triode Q6 and triode Q7 pass through the output of resistance R12 and operational amplifier respectively
End be connected, the emitter of the triode Q6 respectively with mirror-image constant flow source input terminal, the base stage of triode Q4 and triode Q13
Collector is connected, and the collector of the triode Q6 is connected with negative power supply-VACC, the collector and anode of the triode Q4
Power supply+VACC is connected, the transmitting extremely output end of the triode Q4, the base stage of the triode Q13 and one end of resistance R7
Mirror-image constant flow source output end is connect, the emitter of the triode Q13 and the other end of resistance R7, which connect, is followed by the triode Q14
Emitter and resistance R24 the other end, the emitter of the triode Q7 respectively with mirror-image constant flow source input terminal, triode
The base stage of Q10 is connected with the collector of triode Q14, and the collector of the triode Q7 is connected with cathode power supply+VACC, described
The collector of triode Q10 is connected with negative power supply-VACC, the transmitting extremely output end of the triode Q10, the triode
The base stage of Q14 and a termination mirror-image constant flow source output end of resistance R24.
The small-power power amplifier dynamic bias circuit further includes setting in the staggered form diamond circuit output end, right respectively
The current foldback circuit of triode Q4 and triode Q10 overcurrent protection, the current foldback circuit include switching diode D1, three
Pole pipe Q5, triode Q8, resistance R8 and resistance R15, wherein the transmitting with triode Q5 respectively of the total end of the switching diode
Pole is connected with the emitter of triode Q8, other two pin of the switching diode passes through resistance R12 respectively and puts with operation
The output end of big device is connected, and the collector of the triode Q5 is connected with the base stage of triode Q4, the base stage of the triode Q5
It is connected respectively with one end of the emitter of triode Q4 and resistance R8, the other end of the resistance R8 is output end, three pole
The collector of pipe Q8 is connected with the base stage of triode Q10, the base stage of the triode Q8 respectively with the emitter of triode Q10 and
One end of resistance R15 is connected, and the other end of the resistance R15 is output end.
The mirror-image constant flow source includes triode Q3, triode Q9, resistance R2, resistance R3, resistance R18 and resistance R19,
In, the triode Q3 includes the triode Q3-A of base stage docking and triode Q3-B, the triode Q9 include base stage docking
Triode Q9-A and triode Q9-B, the collector of the triode Q3-A be connected with the emitter of triode Q6, emitter
Cathode power supply+VACC is met by resistance R3, the collector of the triode Q3-B base stage phase with base stage and triode Q13 respectively
Even, emitter connects cathode power supply+VACC, the emitter phase of the collector and triode Q7 of the triode Q9-A by resistance R2
Even, emitter meets negative power supply-VACC by resistance R19, the collector of the triode Q9-B respectively with base stage and triode
The base stage of Q14 is connected, and emitter meets negative power supply-VACC by resistance R18.
The working principle of the utility model are as follows:
When input signal is positive half cycle, there is effect to output triode Q7 and Q10, when input signal is negative half period,
There is effect to output triode Q6 and Q4.
When input signal is positive half cycle, the base stage point of triode Q7 is increased, and the base radio pressure Vbe of triode Q7 is positive
Voltage increases, and the collector current Ic for flowing through triode Q7 increases, then corresponding triode Q9-A collector current Ic will increase,
Because triode Q3 and triode Q9 be mirror-image constant flow source, then flow through triode Q9-B collector current also can Ic increase, then
The pressure drop of resistance R24 will increase, and make the electric current for flowing through triode Q14 that can also become larger, and triode Q10 will be made to have more accordingly
Big bias current.Therefore, the signal for inputting positive half cycle is bigger, and the electric current of triode Q14 is bigger, the triode Q10 of output stage
Bias current is bigger.Conversely, the signal of input positive half cycle is smaller, then the triode Q10 bias current of output stage is with regard to smaller.Three
Pole pipe Q8 and resistance R15 is that triode Q10 carries out overcurrent protection.
When input signal is negative half period, the base radio pressure Vbe of the base stage point decline of triode Q6, triode Q6 is positive
Voltage increases, and the collector current Ic for flowing through triode Q6 increases, then correspondingly, triode Q3-A collector current Ic can increase
Greatly, because triode Q3 and triode Q9 be mirror-image constant flow source, then flow through triode Q3-B collector current also can Ic increase, that
Resistance R7 pressure drop will increase, and make to flow through triode Q13 and flow also become larger, the biasing that triode Q4 will be made bigger accordingly
Electric current, therefore, the signal for inputting negative half period are bigger, and the electric current of triode Q13 is bigger, and the triode Q4 bias current of output stage is just
Bigger, conversely, the signal of input negative half period is smaller, then the triode Q4 bias current of output stage is with regard to smaller, triode Q5 and electricity
Hindering R8 is that triode Q4 carries out overcurrent protection.
Compared with prior art, the audio frequency apparatus of the utility model has high parsing power, thin compared to sound with similar product
Greasy, nature, telepresenc be strong, resistance to the characteristics of listening.Further, it is possible to keep the audio frequency apparatus distortion factor low, conversion rate is high, and output impedance is low
It is big with promotion electric current, specifically, the power amplifier of the application can be made to reach high current High Linear amplification analog output stage, 20Hz-
The frequency response (Ref.1kHz) of 20kHz reaches +/- 0.2dB, total harmonic distortion (THD) < 0.002%；Channel separation@
1kHz > 120dB；Dynamic range A- weighted=> 100dB.
The specific embodiment of the above is the better embodiment of the utility model, and it is practical new not to limit this with this
The specific implementation range of type, the scope of the utility model includes being not limited to present embodiment, all according to the utility model
Made equivalence changes are within the protection scope of the present utility model.
Claims (10)
1. a kind of small-power power amplifier dynamic bias circuit, it is characterised in that: including power supply, low-pass filter circuit, operational amplifier,
Mirror-image constant flow source, triode complementary push-pull output circuit, wherein the input terminal of the operational amplifier and low-pass filter circuit
Output end is connected, and the output end of the operational amplifier is connected with the input terminal of triode complementary push-pull output circuit, and described three
Pole pipe complementary push-pull output circuit is connected with mirror-image constant flow source, and the power supply is the operational amplifier, mirror-image constant flow source, three poles
Pipe complementary push-pull output circuit provides supply voltage.
2. small-power power amplifier dynamic bias circuit according to claim 1, it is characterised in that: further include direct current biasing zeroing
Circuit, wherein the input terminal of the direct current biasing zeroing circuit is connected with power output end, the direct current biasing zeroing circuit
Output end is connected with the power input of operational amplifier.
3. small-power power amplifier dynamic bias circuit according to claim 2, it is characterised in that: the direct current biasing zeroing electricity
Road includes resistance R4 and adjustable resistance VR1, and operational amplifier OPAMP includes 8 pins, wherein and pin 2 is inverting input terminal,
Pin 3 is normal phase input end, and pin 6 is output end, and pin 4 is power ground end, and pin 5,1,7,8 is power pins, described
One end of adjustable resistance VR1 is connected with the power pins 1 of operational amplifier OPAMP, the other end and fortune of the adjustable resistance VR1
The power pins 8 for calculating amplifier OPAMP are connected, and the adjustable end of the adjustable resistance VR1 is connected with one end of the resistance R4, institute
The other end for stating resistance R4 is connected with negative power supply-VACC, the pin 7 of the operational amplifier OPAMP connect cathode power supply+
The power pins 5 of VACC, operational amplifier OPAMP suspend.
4. small-power power amplifier dynamic bias circuit according to claim 1, it is characterised in that: further include high frequency compensation electricity
The input terminal on road, the high frequency compensation is connected with the output end of triode complementary push-pull output circuit.
5. small-power power amplifier dynamic bias circuit according to claim 4, it is characterised in that: the high frequency compensation packet
After including resistance R16 and capacitor C5, the resistance R16 and capacitor C5 series connection, one end is defeated with triode complementary push-pull output circuit
Outlet is connected, other end ground connection.
6. small-power power amplifier dynamic bias circuit according to claim 1-5, it is characterised in that: the low pass filtered
Wave circuit includes resistance R5, resistance R9, resistance R14, resistance R17, capacitor C3, capacitor C4, capacitor C1, wherein the first input letter
Number DAC L- is connected by resistance R9 with the inverting input terminal of operational amplifier OPAMP, and the second input signal DAC L+ passes through electricity
Resistance R14 is connected with the normal phase input end of operational amplifier OPAMP, one end and operation amplifier after the resistance R5 and capacitor C1 parallel connection
The inverting input terminal of device OPAMP is connected, and the other end is connected with triode complementary push-pull output circuit output end, the capacitor C3's
One end is connected with the second input signal DAC L+ output end, one end of the resistance R17 and capacitor C4 and operational amplifier OPAMP
Normal phase input end be connected, the other end of the capacitor C3, resistance R17 and capacitor C4 are grounded respectively.
7. small-power power amplifier dynamic bias circuit according to claim 1-5, it is characterised in that: the triode
Complementary push-pull output circuit is staggered form diamond circuit.
8. small-power power amplifier dynamic bias circuit according to claim 7, it is characterised in that: further include to the staggered form
The detection circuit that the electric current of diamond circuit is detected, wherein the staggered form diamond circuit includes triode Q6, triode
Q4, triode Q7, triode Q10, the detection circuit include triode Q13, triode Q14, resistance 7 and resistance R24, described
The base stage of triode Q6 and triode Q7 pass through resistance R12 respectively and are connected with the output end of operational amplifier, the triode Q6
Emitter be connected respectively with the collector of mirror-image constant flow source input terminal, the base stage of triode Q4 and triode Q13, three pole
The collector of pipe Q6 is connected with negative power supply-VACC, and the collector of the triode Q4 is connected with cathode power supply+VACC, described
The transmitting of triode Q4 extremely output end, the base stage of the triode Q13 and a termination mirror-image constant flow source output end of resistance R7,
The emitter of the triode Q13 and the other end of resistance R7, which connect, is followed by the emitter and resistance R24 of the triode Q14
The other end, the emitter of the triode Q7 respectively with mirror-image constant flow source input terminal, the base stage of triode Q10 and triode Q14
Collector be connected, the collector of the triode Q7 is connected with cathode power supply+VACC, the collector of the triode Q10 and
Negative power supply-VACC is connected, the transmitting extremely output end of the triode Q10, the base stage and resistance R24 of the triode Q14
One termination mirror-image constant flow source output end.
9. small-power power amplifier dynamic bias circuit according to claim 8, it is characterised in that: the small-power power amplifier dynamic
Biasing circuit further includes being arranged in the staggered form diamond circuit output end, is protected respectively to triode Q4 and triode Q10 overcurrent
The current foldback circuit of shield, the current foldback circuit include switching diode D1, triode Q5, triode Q8, resistance R8 and
Resistance R15, wherein the total end of the switching diode emitter phase with the emitter of triode Q5 and triode Q8 respectively
Even, other two pin of the switching diode passes through resistance R12 respectively and is connected with the output end of operational amplifier, and described three
The collector of pole pipe Q5 is connected with the base stage of triode Q4, the base stage of the triode Q5 respectively with the emitter of triode Q4 and
One end of resistance R8 is connected, and the other end of the resistance R8 is output end, and the collector of the triode Q8 is with triode Q10's
Base stage is connected, and the base stage of the triode Q8 is connected with one end of the emitter of triode Q10 and resistance R15 respectively, the electricity
The other end for hindering R15 is output end.
10. small-power power amplifier dynamic bias circuit according to claim 8, it is characterised in that: the mirror-image constant flow source packet
Include triode Q3, triode Q9, resistance R2, resistance R3, resistance R18 and resistance R19, wherein the triode Q3 includes base stage
The triode Q3-A and triode Q3-B, the triode Q9 of docking include the triode Q9-A and triode Q9- of base stage docking
The collector of B, the triode Q3-A are connected with the emitter of triode Q6, emitter by resistance R3 connect cathode power supply+
The collector of VACC, the triode Q3-B are connected with the base stage of base stage and triode Q13 respectively, and emitter is connect by resistance R2
Cathode power supply+VACC, the collector of the triode Q9-A are connected with the emitter of triode Q7, and emitter passes through resistance R19
Negative power supply-VACC is met, the collector of the triode Q9-B is connected with the base stage of base stage and triode Q14 respectively, emitter
Negative power supply-VACC is met by resistance R18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920624663.9U CN209676461U (en) | 2019-04-30 | 2019-04-30 | A kind of small-power power amplifier dynamic bias circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920624663.9U CN209676461U (en) | 2019-04-30 | 2019-04-30 | A kind of small-power power amplifier dynamic bias circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209676461U true CN209676461U (en) | 2019-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920624663.9U Withdrawn - After Issue CN209676461U (en) | 2019-04-30 | 2019-04-30 | A kind of small-power power amplifier dynamic bias circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109982205A (en) * | 2019-04-30 | 2019-07-05 | 先歌国际影音有限公司 | A kind of small-power power amplifier dynamic bias circuit |
| CN112331044A (en) * | 2020-11-14 | 2021-02-05 | 廊坊师范学院 | Photovoltaic power generation system for teaching |
-
2019
- 2019-04-30 CN CN201920624663.9U patent/CN209676461U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109982205A (en) * | 2019-04-30 | 2019-07-05 | 先歌国际影音有限公司 | A kind of small-power power amplifier dynamic bias circuit |
| 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 |
| CN112331044A (en) * | 2020-11-14 | 2021-02-05 | 廊坊师范学院 | Photovoltaic power generation system for teaching |
| CN112331044B (en) * | 2020-11-14 | 2021-07-13 | 廊坊师范学院 | Photovoltaic power generation system for teaching |
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Address after: 518000 1st floor, electronic building, Jiuwei Xiange technology and Culture Industrial Park, Jiuwei community, Hangcheng street, Bao'an District, Shenzhen, Guangdong Province Patentee after: IAG Group Ltd. Address before: 518000 Jiuwei Xiange science and Technology Industrial Park, Xi Township, Bao'an District, Shenzhen City, Guangdong Province Patentee before: IAG GROUP Co.,Ltd. |
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Granted publication date: 20191122 Effective date of abandoning: 20231121 |
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Granted publication date: 20191122 Effective date of abandoning: 20231121 |