CN202077000U - Audio frequency power amplifier automatic switching circuit and power amplifier chip - Google Patents
Audio frequency power amplifier automatic switching circuit and power amplifier chip Download PDFInfo
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- CN202077000U CN202077000U CN2011201630734U CN201120163073U CN202077000U CN 202077000 U CN202077000 U CN 202077000U CN 2011201630734 U CN2011201630734 U CN 2011201630734U CN 201120163073 U CN201120163073 U CN 201120163073U CN 202077000 U CN202077000 U CN 202077000U
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Abstract
The utility model is applied to the field of audio frequency power amplifier, and provides an audio frequency power amplifier automatic switching circuit and a power amplifier chip. The audio frequency power amplifier automatic switching circuit comprises a first power amplifier pre-stage circuit, a switch module, a second power amplifier and driving circuit and a power amplifier output stage module. The audio frequency power amplifier automatic switching circuit receives switch control signals outputted by a switch control signal source via the switch module, the audio frequency power amplifier automatic switching circuit controls and selects audio signals outputted by an audio signal generator or modulated audio signals outputted by the first power amplifier pre-stage circuit as effective input signals of the switch module, and outputs the effective input signals of the switch module, thereby realizing the purpose of realizing automatically switching and using the most appropriate power amplifier according to real usage needs in the same audio frequency power amplifier circuit. The audio frequency power amplifier automatic switching circuit has a strong adaptability and various functions.
Description
Technical field
The utility model belongs to the audio frequency power amplifier field, relates in particular to a kind of audio frequency power amplifier automatic switch-over circuit and power amplifier chip.
Background technology
At present, the AB power-like amplifier has can be realized high-power and characteristics better tone quality, yet the quiescent dissipation of AB class power amplifier is excessive, can not get utilizing preferably in the less demanding field of tonequality; The D power-like amplifier can utilize in the less demanding field of tonequality, yet the EMI problem that its inherent electromagnetic interference (EMI) problem is compared AB class power amplifier is more serious because its high efficiency advantage has solved the quiescent dissipation problems of too preferably.Existing audio power amplifier circuit all only has the function of AB class power amplifier or D class power amplifier, for example, in the occasion of tonequality being had relatively high expectations, EMI has relatively high expectations, we use the circuit with AB class power amplifier function, and when efficient is had relatively high expectations, when EMI is less demanding, we must reuse the circuit with D class power amplifier function, use the function of only power amplifier because prior art is implemented in the same power amplifier to automatically switch according to actual needs, cause that existing audio power amplifier circuit adaptability is relatively poor, the problem of function singleness.
Summary of the invention
The purpose of this utility model is to provide a kind of audio frequency power amplifier automatic switch-over circuit, be intended to solve prior art and be not implemented in to automatically switch according to actual needs in the same power amplifier and use the function of only power amplifier, cause that existing audio power amplifier circuit adaptability is relatively poor, the problem of function singleness.
The utility model is achieved in that a kind of audio frequency power amplifier automatic switch-over circuit, is connected with audio signal generator, switch controlling signal source, reference voltage source and power supply, and described audio frequency power amplifier automatic switch-over circuit comprises:
First input end is connected with the output of described audio signal generator, the audio signal from described audio signal generator output that receives is carried out pulse-width modulation handle, the first power amplifier front stage circuits of the audio signal after the output modulation;
First input end is connected with the output of the described first power amplifier front stage circuits, second input is connected with the first input end of the described first power amplifier front stage circuits, the 3rd input is connected with the output in described switch controlling signal source, receive the switch controlling signal of described switch controlling signal source output, and according to described switch controlling signal, audio signal after the audio signal of the described audio signal generator output of control selection or the modulation of described first power amplifier front stage circuits output is effective input signal, exports the switch module of described effective input signal;
First input end is connected with the output of described switch module, second input is connected with the output of described reference voltage source, receive the effective input signal of described switch module output and the reference voltage signal of described reference voltage source output, and, produce and export second power amplifier and the drive circuit of first drive control signal and second drive control signal according to described effective input signal and described reference voltage signal; And
First input end is connected with first output of described second power amplifier and drive circuit, second input is connected with second output of described second power amplifier and drive circuit, the 3rd input is connected with the output of described power supply, output is connected with second input of the described first power amplifier front stage circuits and the 3rd input of described second power amplifier and drive circuit simultaneously, receive first drive control signal and second drive control signal that described second power amplifier and drive circuit produce, and the audio signal after amplifying according to described first drive control signal and the second drive control signal power output, utilize the audio signal after the described power amplification that the input signal of described second power amplifier and drive circuit and the audio input signal of the described first power amplifier front stage circuits are carried out the power amplifier output level module that linear amplification is handled.
In the said structure, described switch module comprises inverter Inv1, P type metal-oxide-semiconductor M1, N type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3 and N type metal-oxide-semiconductor M4, the normal phase input end of described inverter Inv1 is the first input end of described switch module, and the normal phase input end of described inverter Inv1 connects the base stage of described P type metal-oxide-semiconductor M1 and the base stage of described N type metal-oxide-semiconductor M4 simultaneously, the inverting input of described inverter Inv1 connects the base stage of described N type metal-oxide-semiconductor M2 and the base stage of described P type metal-oxide-semiconductor M3 simultaneously, the source electrode of described P type metal-oxide-semiconductor M1 connects the source electrode of described N type metal-oxide-semiconductor M2 and the first input end of the preceding utmost point module of described first power amplifier simultaneously, the drain electrode while of described P type metal-oxide-semiconductor M1 and the drain electrode of described N type metal-oxide-semiconductor M2, the drain electrode of the drain electrode of described P type metal-oxide-semiconductor M3 and described N type metal-oxide-semiconductor M4 is connected, and the drain electrode of described P type metal-oxide-semiconductor M1 is the output of described switch module, the source electrode of described P type metal-oxide-semiconductor M3 is connected with the output of utmost point module and the source electrode of described N type metal-oxide-semiconductor M4 before described first power amplifier simultaneously, and the drain electrode of described P type metal-oxide-semiconductor M3 is connected with the drain electrode of described N type metal-oxide-semiconductor M4.
In the said structure, described power amplifier output level module comprises P type metal-oxide-semiconductor M5 and N type metal-oxide-semiconductor M6, the base stage of described P type metal-oxide-semiconductor M5 is the first input end of described power amplifier output level module, the source electrode of described P type metal-oxide-semiconductor M5 is the 3rd input of described power amplifier output level module, the drain electrode while of described P type metal-oxide-semiconductor M5 and the drain electrode of described N type metal-oxide-semiconductor M6, second input of the 3rd input of described second power amplifier and drive circuit and the described first power amplifier prime module is connected, and the drain electrode of described P type metal-oxide-semiconductor M5 is the output of described power amplifier output level module, the base stage of described N type metal-oxide-semiconductor M6 is second output of described second power amplifier and drive circuit, the source ground of described N type metal-oxide-semiconductor M6.
Another purpose of the present utility model is to provide a kind of power amplifier chip that comprises above-mentioned audio frequency power amplifier automatic switch-over circuit.
In the utility model, the audio frequency power amplifier automatic switch-over circuit comprises the first power amplifier front stage circuits, switch module, second power amplifier and drive circuit and power amplifier output level module.Switch module receives the switch controlling signal of this switch controlling signal source output, according to this switch controlling signal, audio signal after the audio signal of control selection audio signal generator output or the modulation of this first power amplifier front stage circuits output is effective input signal of this switch module, and export effective input signal of this switch module, use the purpose of only power amplifier, this audio frequency power amplifier automatic switch-over circuit to have that adaptability is strong, the advantage of diverse in function thereby reaching in same audio power amplifier circuit automaticallyes switch according to actual needs.
Description of drawings
Fig. 1 is the module map of the audio frequency power amplifier automatic switch-over circuit that provides of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the audio frequency power amplifier automatic switch-over circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the modular structure of the audio frequency power amplifier automatic switch-over circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model, and details are as follows.
The audio frequency power amplifier automatic switch-over circuit comprises:
The first power amplifier front stage circuits 101, switch module 102, second power amplifier and drive circuit 103 and power amplifier output level module 104.
The first power amplifier front stage circuits 101, comprise two inputs and an output, the first input end of the first power amplifier front stage circuits 101 is connected with the output of audio signal generator, the audio signal from this audio signal generator output that receives is carried out pulse-width modulation handle, the audio signal after the output modulation;
Second power amplifier and drive circuit 103, comprise three inputs and two outputs, the first input end of this second power amplifier and drive circuit 103 is connected with the output of switch module 102, second input of this second power amplifier and drive circuit 103 is connected with the output of reference voltage source, receive the effective input signal of these switch module 102 outputs and the reference voltage signal of this reference voltage source output, and, produce first drive control signal and second drive control signal and output according to this effective input signal and this reference voltage signal; And
Power amplifier output level module 104, comprise three inputs and an output, the first input end of this power amplifier output level module 104 is connected with first output of second power amplifier and drive circuit 103, second input of this power amplifier output level module 104 is connected with second output of this second power amplifier and drive circuit 103, the 3rd input of this power amplifier output level module 104 is connected with the output of power supply, the output of this power amplifier output level module 104 is connected with second input of the first power amplifier front stage circuits 101 and the 3rd input of this second power amplifier and drive circuit 103 simultaneously, receive first drive control signal and second drive control signal that this second power amplifier and drive circuit 103 produce, and according to this first drive control signal and second drive control signal, audio signal after power output is amplified is utilized audio signal after this power amplification that the audio input signal of the input signal of this second power amplifier and drive circuit 103 and this first power amplifier front stage circuits 101 is carried out linear amplification and is handled.
As the utility model one embodiment, the first power amplifier front stage circuits 101 is a D class power amplifier front stage circuits.
As the utility model one embodiment, second power amplifier and drive circuit 103 are AB class power amplifier and drive circuit.
Fig. 2 shows the exemplary circuit structure of the audio frequency power amplifier automatic switch-over circuit that the utility model embodiment provides.
As the utility model one embodiment, switch module 102 comprises inverter Inv1, P type metal-oxide-semiconductor M1, N type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3 and N type metal-oxide-semiconductor M4, the normal phase input end of this inverter Inv1 is the first input end of this switch module 102, and the normal phase input end of this inverter Inv1 connects the base stage of this P type metal-oxide-semiconductor M1 and the base stage of this N type metal-oxide-semiconductor M4 simultaneously, the inverting input of this inverter Inv1 connects the base stage of this N type metal-oxide-semiconductor M2 and the base stage of this P type metal-oxide-semiconductor M3 simultaneously, the source electrode of this P type metal-oxide-semiconductor M1 connects the source electrode of this N type metal-oxide-semiconductor M2 and the first input end of the preceding utmost point module 101 of this first power amplifier simultaneously, the drain electrode while of this P type metal-oxide-semiconductor M1 and the drain electrode of this N type metal-oxide-semiconductor M2, the drain electrode of the drain electrode of this P type metal-oxide-semiconductor M3 and this N type metal-oxide-semiconductor M4 is connected, and the drain electrode of this P type metal-oxide-semiconductor M1 is the output of this switch module 102, the source electrode of this P type metal-oxide-semiconductor M3 is connected with the output of utmost point module 101 and the source electrode of this N type metal-oxide-semiconductor M4 before this first power amplifier simultaneously, and the drain electrode of this P type metal-oxide-semiconductor M3 is connected with the drain electrode of this N type metal-oxide-semiconductor M4.
As the utility model one embodiment, power amplifier output level module 104 comprises P type metal-oxide-semiconductor M5 and N type metal-oxide-semiconductor M6, the base stage of this P type metal-oxide-semiconductor M5 is the first input end of this power amplifier output level module 104, the source electrode of this P type metal-oxide-semiconductor M5 is the 3rd input of this power amplifier output level module 104, the drain electrode while of this P type metal-oxide-semiconductor M5 and the drain electrode of this N type metal-oxide-semiconductor M6, second input of the 3rd input of this second power amplifier and drive circuit 103 and this first power amplifier prime module 101 is connected, and the drain electrode of this P type metal-oxide-semiconductor M5 is the output of this power amplifier output level module 104, the base stage of this N type metal-oxide-semiconductor M6 is second output of this second power amplifier and drive circuit 103, the source ground of this N type metal-oxide-semiconductor M6.
The operation principle of audio frequency power amplifier automatic switch-over circuit is:
When the switch controlling signal of switch controlling signal source output is high level, switch module 102 receives this high level signal, this moment, the normal phase input end of inverter Inv1 was a high level, the reversed-phase output of this inverter inv1 is a low level, then P type metal-oxide-semiconductor M1 and N type metal-oxide-semiconductor M2 all end, P type metal-oxide-semiconductor M3 and the equal conducting of N type metal-oxide-semiconductor M4, audio signal after the modulation of the first power amplifier front stage circuits, 101 outputs is effective input signal of this switch module 102, and the audio signal of audio signal generator output is the invalid input signal of this switch module 102, after effective input signal this second power amplifier of process of this switch module 102 and drive circuit 103 are handled, export first drive control signal and the second controlling and driving signal respectively to the first input end and second input of this power amplifier output level module 104, thereby realize the function of D class power amplifier.
When the switch controlling signal of switch controlling signal source output is low level, switch module 102 receives this low level signal, this moment, the normal phase input end of inverter Inv1 was a low level, the reversed-phase output of this inverter inv1 is a high level, then P type metal-oxide-semiconductor M1 and the equal conducting of N type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3 and N type metal-oxide-semiconductor M4 all end, audio signal after the modulation of the first power amplifier front stage circuits, 101 outputs is the invalid input signal of this switch module 102, and the audio signal of audio signal generator output is effective input signal of this switch module 102, after effective input signal this second power amplifier of process of this switch module 102 and drive circuit 103 are handled, export first drive control signal and the second controlling and driving signal respectively to the first input end and second input of this power amplifier output level module 104, thereby realize the function of AB class power amplifier.
The utility model embodiment also provides a power amplifier chip that comprises above-mentioned audio frequency power amplifier automatic switch-over circuit.
In the utility model, the audio frequency power amplifier automatic switch-over circuit comprises the first power amplifier front stage circuits 101, switch module 102, second power amplifier and drive circuit 103 and power amplifier output level module 104, close module 102 and receive the switch controlling signal that export in this switch controlling signal source, according to this switch controlling signal, audio signal after the audio signal of control selection audio signal generator output or the modulation of this first power amplifier front stage circuits 101 outputs is effective input signal of this switch module 102, and export effective input signal of this switch module 102, use the purpose of only power amplifier thereby reaching automaticallyes switch in same audio power amplifier circuit according to actual needs, it is strong that this audio frequency power amplifier automatic switch-over circuit has adaptability, the advantage of diverse in function.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. an audio frequency power amplifier automatic switch-over circuit is connected with audio signal generator, switch controlling signal source, reference voltage source and power supply, it is characterized in that described audio frequency power amplifier automatic switch-over circuit comprises:
First input end is connected with the output of described audio signal generator, the audio signal from described audio signal generator output that receives is carried out pulse-width modulation handle, the first power amplifier front stage circuits of the audio signal after the output modulation;
First input end is connected with the output of the described first power amplifier front stage circuits, second input is connected with the first input end of the described first power amplifier front stage circuits, the 3rd input is connected with the output in described switch controlling signal source, receive the switch controlling signal of described switch controlling signal source output, and according to described switch controlling signal, audio signal after the audio signal of the described audio signal generator output of control selection or the modulation of described first power amplifier front stage circuits output is effective input signal, exports the switch module of described effective input signal;
First input end is connected with the output of described switch module, second input is connected with the output of described reference voltage source, receive the effective input signal of described switch module output and the reference voltage signal of described reference voltage source output, and, produce and export second power amplifier and the drive circuit of first drive control signal and second drive control signal according to described effective input signal and described reference voltage signal; And
First input end is connected with first output of described second power amplifier and drive circuit, second input is connected with second output of described second power amplifier and drive circuit, the 3rd input is connected with the output of described power supply, output is connected with second input of the described first power amplifier front stage circuits and the 3rd input of described second power amplifier and drive circuit simultaneously, receive first drive control signal and second drive control signal that described second power amplifier and drive circuit produce, and the audio signal after amplifying according to described first drive control signal and the second drive control signal power output, utilize the audio signal after the described power amplification that the input signal of described second power amplifier and drive circuit and the audio input signal of the described first power amplifier front stage circuits are carried out the power amplifier output level module that linear amplification is handled.
2. audio frequency power amplifier automatic switch-over circuit as claimed in claim 1 is characterized in that, the described first power amplifier front stage circuits is a D class power amplifier front stage circuits.
3. audio frequency power amplifier automatic switch-over circuit as claimed in claim 1, it is characterized in that, described switch module comprises inverter Inv1, P type metal-oxide-semiconductor M1, N type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3 and N type metal-oxide-semiconductor M4, the normal phase input end of described inverter Inv1 is the first input end of described switch module, and the normal phase input end of described inverter Inv1 connects the base stage of described P type metal-oxide-semiconductor M1 and the base stage of described N type metal-oxide-semiconductor M4 simultaneously, the inverting input of described inverter Inv1 connects the base stage of described N type metal-oxide-semiconductor M2 and the base stage of described P type metal-oxide-semiconductor M3 simultaneously, the source electrode of described P type metal-oxide-semiconductor M1 connects the source electrode of described N type metal-oxide-semiconductor M2 and the first input end of the preceding utmost point module of described first power amplifier simultaneously, the drain electrode while of described P type metal-oxide-semiconductor M1 and the drain electrode of described N type metal-oxide-semiconductor M2, the drain electrode of the drain electrode of described P type metal-oxide-semiconductor M3 and described N type metal-oxide-semiconductor M4 is connected, and the drain electrode of described P type metal-oxide-semiconductor M1 is the output of described switch module, the source electrode of described P type metal-oxide-semiconductor M3 is connected with the output of utmost point module and the source electrode of described N type metal-oxide-semiconductor M4 before described first power amplifier simultaneously, and the drain electrode of described P type metal-oxide-semiconductor M3 is connected with the drain electrode of described N type metal-oxide-semiconductor M4.
4. audio frequency power amplifier automatic switch-over circuit as claimed in claim 1 is characterized in that, described second power amplifier and drive circuit are AB class power amplifier and drive circuit.
5. audio frequency power amplifier automatic switch-over circuit as claimed in claim 1, it is characterized in that, described power amplifier output level module comprises P type metal-oxide-semiconductor M5 and N type metal-oxide-semiconductor M6, the base stage of described P type metal-oxide-semiconductor M5 is the first input end of described power amplifier output level module, the source electrode of described P type metal-oxide-semiconductor M5 is the 3rd input of described power amplifier output level module, the drain electrode while of described P type metal-oxide-semiconductor M5 and the drain electrode of described N type metal-oxide-semiconductor M6, second input of the 3rd input of described second power amplifier and drive circuit and the described first power amplifier prime module is connected, and the drain electrode of described P type metal-oxide-semiconductor M5 is the output of described power amplifier output level module, the base stage of described N type metal-oxide-semiconductor M6 is second output of described second power amplifier and drive circuit, the source ground of described N type metal-oxide-semiconductor M6.
6. a power amplifier chip comprises audio signal generator, switch controlling signal source, reference voltage source and power supply, it is characterized in that, described power amplifier chip also comprises the audio frequency power amplifier automatic switch-over circuit, and described audio frequency power amplifier automatic switch-over circuit comprises:
First input end is connected with the output of described audio signal generator, the audio signal from described audio signal generator output that receives is carried out pulse-width modulation handle, the first power amplifier front stage circuits of the audio signal after the output modulation;
First input end is connected with the output of the described first power amplifier front stage circuits, second input is connected with the first input end of the described first power amplifier front stage circuits, the 3rd input is connected with the output in described switch controlling signal source, receive the switch controlling signal of described switch controlling signal source output, and according to described switch controlling signal, audio signal after the audio signal of the described audio signal generator output of control selection or the modulation of described first power amplifier front stage circuits output is effective input signal, exports the switch module of described effective input signal;
First input end is connected with the output of described switch module, second input is connected with the output of described reference voltage source, receive the effective input signal of described switch module output and the reference voltage signal of described reference voltage source output, and, produce and export second power amplifier and the drive circuit of first drive control signal and second drive control signal according to described effective input signal and described reference voltage signal; And
First input end is connected with first output of described second power amplifier and drive circuit, second input is connected with second output of described second power amplifier and drive circuit, the 3rd input is connected with the output of described power supply, output is connected with second input of the described first power amplifier front stage circuits and the 3rd input of described second power amplifier and drive circuit simultaneously, receive first drive control signal and second drive control signal that described second power amplifier and drive circuit produce, and the audio signal after amplifying according to described first drive control signal and the second drive control signal power output, utilize the audio signal after the described power amplification that the input signal of described second power amplifier and drive circuit and the audio input signal of the described first power amplifier front stage circuits are carried out the power amplifier output level module that linear amplification is handled.
7. power amplifier chip as claimed in claim 6 is characterized in that, the described first power amplifier front stage circuits is a D class power amplifier front stage circuits.
8. power amplifier chip as claimed in claim 6, it is characterized in that, described switch module comprises inverter Inv1, P type metal-oxide-semiconductor M1, N type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3 and N type metal-oxide-semiconductor M4, the normal phase input end of described inverter Inv1 is the first input end of described switch module, and the normal phase input end of described inverter Inv1 connects the base stage of described P type metal-oxide-semiconductor M1 and the base stage of described N type metal-oxide-semiconductor M4 simultaneously, the inverting input of described inverter Inv1 connects the base stage of described N type metal-oxide-semiconductor M2 and the base stage of described P type metal-oxide-semiconductor M3 simultaneously, the source electrode of described P type metal-oxide-semiconductor M1 connects the source electrode of described N type metal-oxide-semiconductor M2 and the first input end of the preceding utmost point module of described first power amplifier simultaneously, the drain electrode while of described P type metal-oxide-semiconductor M1 and the drain electrode of described N type metal-oxide-semiconductor M2, the drain electrode of the drain electrode of described P type metal-oxide-semiconductor M3 and described N type metal-oxide-semiconductor M4 is connected, and the drain electrode of described P type metal-oxide-semiconductor M1 is the output of described switch module, the source electrode of described P type metal-oxide-semiconductor M3 is connected with the output of utmost point module and the source electrode of described N type metal-oxide-semiconductor M4 before described first power amplifier simultaneously, and the drain electrode of described P type metal-oxide-semiconductor M3 is connected with the drain electrode of described N type metal-oxide-semiconductor M4.
9. power amplifier chip as claimed in claim 6 is characterized in that, described second power amplifier and drive circuit are AB class power amplifier and drive circuit.
10. power amplifier chip as claimed in claim 6, it is characterized in that, described power amplifier output level module comprises P type metal-oxide-semiconductor M5 and N type metal-oxide-semiconductor M6, the base stage of described P type metal-oxide-semiconductor M5 is the first input end of described power amplifier output level module, the source electrode of described P type metal-oxide-semiconductor M5 is the 3rd input of described power amplifier output level module, the drain electrode while of described P type metal-oxide-semiconductor M5 and the drain electrode of described N type metal-oxide-semiconductor M6, second input of the 3rd input of described second power amplifier and drive circuit and the described first power amplifier prime module is connected, and the drain electrode of described P type metal-oxide-semiconductor M5 is the output of described power amplifier output level module, the base stage of described N type metal-oxide-semiconductor M6 is second output of described second power amplifier and drive circuit, the source ground of described N type metal-oxide-semiconductor M6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201630734U CN202077000U (en) | 2011-05-20 | 2011-05-20 | Audio frequency power amplifier automatic switching circuit and power amplifier chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201630734U CN202077000U (en) | 2011-05-20 | 2011-05-20 | Audio frequency power amplifier automatic switching circuit and power amplifier chip |
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| CN202077000U true CN202077000U (en) | 2011-12-14 |
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| CN2011201630734U Expired - Lifetime CN202077000U (en) | 2011-05-20 | 2011-05-20 | Audio frequency power amplifier automatic switching circuit and power amplifier chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147026A (en) * | 2019-09-23 | 2020-05-12 | 广东小天才科技有限公司 | Audio power amplifier, audio playing device and audio playing method |
| CN113825067A (en) * | 2021-09-27 | 2021-12-21 | 恒玄科技(上海)股份有限公司 | Audio power amplifier driving circuit, circuit control method and device |
-
2011
- 2011-05-20 CN CN2011201630734U patent/CN202077000U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147026A (en) * | 2019-09-23 | 2020-05-12 | 广东小天才科技有限公司 | Audio power amplifier, audio playing device and audio playing method |
| CN113825067A (en) * | 2021-09-27 | 2021-12-21 | 恒玄科技(上海)股份有限公司 | Audio power amplifier driving circuit, circuit control method and device |
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