CN101667827B - Auxiliary starting circuit of audio frequency power amplifier - Google Patents

Auxiliary starting circuit of audio frequency power amplifier Download PDF

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CN101667827B
CN101667827B CN2009100558661A CN200910055866A CN101667827B CN 101667827 B CN101667827 B CN 101667827B CN 2009100558661 A CN2009100558661 A CN 2009100558661A CN 200910055866 A CN200910055866 A CN 200910055866A CN 101667827 B CN101667827 B CN 101667827B
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power amplifier
audio frequency
frequency power
switch
branch road
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CN101667827A (en
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李淼
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Shanghai Beiling Co Ltd
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Abstract

The invention relates to an auxiliary starting circuit of an audio frequency power amplifier, wherein an input end of the auxiliary starting circuit is respectively connected with an external power supply and an external power amplifier starting circuit and an output end is connected with the input end of the audio frequency power amplifier, the input end of the auxiliary starting circuit comprises a same-phase input end, an inverse-phase input end and a common-mode input end; the auxiliary starting circuit comprises a high-resistance voltage divider branch and a switch network connected with the high-resistance voltage divider branch, the high-resistance voltage divider branch outputs one or more auxiliary bias voltages to the switch network; and the switch network receives the auxiliary bias voltage (s) and outputs the auxiliary bias voltage (s) to the input end of the audio frequency power amplifier to enable the high-resistance voltage divider branch to charge a capacitor at one side of the input end of the audio frequency power amplifier when the power amplifier is in a sleeping state. The invention can provide charge current for a peripheral circuit of the power amplifier when the audio frequency power amplifier is in a sleeping state, reduces the difference of steady state voltage values of the capacitor in the peripheral circuit of the power amplifier between the sleeping state and the working state of the power amplifier, and realizes the rapid starting and the distortion prevention of the audio frequency power amplifier.

Description

A kind of auxiliary starting circuit of audio frequency power amplifier
Technical field
The present invention relates to a kind of auxiliary starting circuit of audio frequency power amplifier.
Background technology
Audio frequency power amplifier in working order and the moment of switching between the resting state because the charging imbalance of electric capacity in the peripheral circuit can produce transient state output on loud speaker, shows the of short duration distorsion that can hear for people's ear.In addition, under the audio frequency power amplifier operating state, its peripheral power amplifier syntype bias circuit can produce a common-mode voltage, for the audio frequency power amplifier input provides the power amplifier syntype bias; Under the audio frequency power amplifier resting state, traditional power amplifier start-up circuit can produce a discharge path, thereby with the whole ground connection of biasing of power amplifier syntype bias and power amplifier peripheral circuit.Therefore when audio frequency power amplifier in working order and when switching between the resting state, the power amplifier syntype bias can take place to change rapidly and produce distorsion and export.
Present anti-distorsion technology comprises a start-up circuit in power amplifier, in the moment that the power amplifier state switches, start-up circuit charges to electric capacity in the peripheral circuit, and forbids the output of power amplifier power, thereby reaches the effect of anti-distorsion.
Yet the effect that reaches no obvious distorsion start-up time that existing anti-distorsion Technology Need is long is mainly used in and waits for electric capacity charging balance in the peripheral circuit required long start-up time.Because peripheral circuit RC network structure itself is uneven, and the peripheral circuit RC network also has nothing in common with each other under the different application conditions, therefore be difficult to be implemented under the various application conditions can both be not only quick but also the charging of balance for existing audio power amplifier start-up circuit.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the present invention aims to provide a kind of simple and reliable auxiliary starting circuit of audio frequency power amplifier, and reaching under the audio frequency power amplifier resting state provides charging current, realizes that audio frequency power amplifier starts fast and the effect of anti-distorsion.
A kind of auxiliary starting circuit of audio frequency power amplifier of the present invention, its input is connected with external power source and outside power amplifier start-up circuit respectively, its output is connected with the input of described audio frequency power amplifier, this input comprises in-phase input end, inverting input and common mode input, described auxiliary starting circuit comprises high resistance sectional pressure branch road and connected switching network
The described switching network of described high resistance sectional pressure Zhi Luxiang is exported one or more assisted bias voltage;
Described switching network receives described assisted bias voltage, and outputs to the input of described audio frequency power amplifier, makes described high resistance sectional pressure branch road under the power amplifier resting state, to the electric capacity charging of described audio frequency power amplifier input one side.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described high resistance sectional pressure branch road comprises the first resistive network and the second resistive network that is connected in series in successively between described external power source and the ground, and this first resistive network and described assisted bias voltage of second resistive network dividing potential drop output.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, the described first resistive network and the second resistive network are respectively a resistance.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, the described first resistive network and the second resistive network include a MOS device or one group of MOS device that is connected in series, the grid of described each MOS device is connected with drain electrode, and the conducting direction in described high resistance sectional pressure branch road is a forward conduction.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described high resistance sectional pressure branch road also comprises the 3rd resistive network that is connected in series between the described first resistive network and the second resistive network, and two described assisted bias voltages of this first resistive network, the 3rd resistive network and second resistive network dividing potential drop output in twos.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described the 3rd resistive network is a resistance.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described the 3rd resistive network comprises a MOS device or one group of MOS device that is connected in series, the grid of described each MOS device is connected with drain electrode, and the conducting direction in described high resistance sectional pressure branch road is a forward conduction.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described switching network comprises first switch, a signal end of this first switch receives an assisted bias voltage of described high resistance sectional pressure branch road output, another signal end is connected with the inverting input of described audio frequency power amplifier, and the control end of first switch receives the control signal of described outside power amplifier start-up circuit output.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described first switch is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described switching network also comprises second switch, a signal end of this second switch receives an assisted bias voltage of described high resistance sectional pressure branch road output, another signal end is connected with the in-phase input end of described audio frequency power amplifier, and the control end of second switch receives the control signal of described outside power amplifier start-up circuit output.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described second switch is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described switching network also comprises the 3rd switch, a signal end of the 3rd switch receives an assisted bias voltage of described high resistance sectional pressure branch road output, another signal end is connected with the common mode input of described audio frequency power amplifier, and the control end of the 3rd switch receives the control signal of described outside power amplifier start-up circuit output.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described the 3rd switch is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described switching network also comprises a resistance device, one termination of this resistance device is received an assisted bias voltage of described high resistance sectional pressure branch road output, the other end is connected with the common mode input of described audio frequency power amplifier, and described resistance device provides syntype bias for described audio frequency power amplifier common mode input under the state of described external power source.
In above-mentioned auxiliary starting circuit of audio frequency power amplifier, described switching network also comprises a zero impedance branch road, and this zero impedance branch road is input to an assisted bias voltage of described high resistance sectional pressure branch road output the common mode input of described audio frequency power amplifier.
Owing to adopted above-mentioned technical solution, the present invention can be under the state of power amplifier dormancy, the weak current that utilizes high resistance sectional pressure branch road electric capacity charging in the circuit to the periphery, make in the peripheral circuit all electric capacity before starting in advance near stability, thereby shorten start-up time.For example in typical portable equipment is used, limiting value on the existing anti-distorsion circuit start time theory is about 100 milliseconds, start-up time, every shortening was 10 milliseconds, the distorsion peak power increases nearly 16 times, adopt auxiliary starting circuit of the present invention, can when guaranteeing equal anti-distorsion effect, will foreshorten to start-up time less than 10 milliseconds.In addition, the present invention can produce one or more assisted bias voltage under the state of power supply power supply, output to audio frequency power amplifier common mode input, thereby substitute traditional peripheral power amplifier syntype bias circuit and provide syntype bias for audio frequency power amplifier common mode input, make audio frequency power amplifier in working order and when switching between the resting state, its syntype bias changes less, thereby avoids producing distorsion power.
Description of drawings
Fig. 1 is the circuit diagram of the first routine preferred embodiment of auxiliary starting circuit of audio frequency power amplifier of the present invention;
Fig. 2 is the circuit diagram of the second routine preferred embodiment of auxiliary starting circuit of audio frequency power amplifier of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
As shown in Figure 1 and Figure 2, the present invention, it is a kind of auxiliary starting circuit of audio frequency power amplifier, its input is connected with external power source (not shown) and outside power amplifier start-up circuit (not shown) respectively, its output is connected with the input of described audio frequency power amplifier, and this input comprises in-phase input end V2, inverting input V1 and common mode input V3, and auxiliary starting circuit comprises high resistance sectional pressure branch road 101 and connected switching network 102, wherein
High resistance sectional pressure branch road 101 is to the one or more assisted bias voltage of switching network 102 outputs;
Switching network 102 outputs to the input of audio frequency power amplifier with the assisted bias voltage that receives, and makes high resistance sectional pressure branch road 101 under the power amplifier resting state, to the electric capacity charging of audio frequency power amplifier input one side.
First kind of preferred embodiment of the present invention be as shown in Figure 1:
High resistance sectional pressure branch road 101 comprises the first resistive network 201 and the second resistive network 202 that is connected in series in successively between external power source and the ground.Under the state of power supply power supply, the first resistive network 201 and the second resistive network, 202 dividing potential drops produce an assisted bias voltage and output to switching network 102.The equiva lent impedance of high resistance sectional pressure branch road 101 between power supply and ground can make it only consume faint quiescent current under the power amplifier resting state far above the equiva lent impedance of traditional peripheral power amplifier syntype bias circuit.If audio frequency power amplifier switches to the interval long period the operating state from power supply electrifying to it, promptly much larger than start-up time, then the weak current of high resistance sectional pressure branch road 101 output can make electric capacity in the peripheral circuit charged state significantly near its stable state, start required time thereby shorten.If through above starting state once, then the weak current of high resistance sectional pressure branch road 101 outputs only need be above the leakage current of electric capacity in the peripheral circuit before resting state for audio frequency power amplifier, capacitance voltage maintains near the former stable state.
Because auxiliary starting circuit of audio frequency power amplifier output impedance of the present invention is very high, even can be far above the output impedance of outside power amplifier start-up circuit, thereby can be under the audio frequency power amplifier operating state output offset voltage still, charge to the power amplifier input end capacitor simultaneously with outside power amplifier start-up circuit.The technical program can be simplified the control signal of auxiliary starting circuit, and can not affect greatly power amplifier work state.
In the present embodiment, the first resistive network 201 and the second resistive network 202 are respectively a resistance, because electric resistance partial pressure obtains more accurate bias voltage easily, therefore, can be near the precision of traditional peripheral power amplifier syntype bias circuit.
Switching network 102 comprises first switch 301, in the present embodiment, first switch 301 is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, its grid is a control end, wherein, control end then receives the control signal of outside power amplifier start-up circuit output, a signal end receives an assisted bias voltage of high resistance sectional pressure branch road 101 outputs, another signal end is connected with the inverting input V1 of audio frequency power amplifier, and this signal end can be directly to link to each other with the inverting input V1 of audio frequency power amplifier, also can be to link to each other with the inverting input V1 of audio frequency power amplifier by resistance-capacitance network and switch in the outside power amplifier start-up circuit.Under the power amplifier resting state, 301 conductings of first switch finally are implemented under the power amplifier resting state, a bias voltage of high resistance sectional pressure branch road 101 are exported to the electric capacity of audio frequency power amplifier inverting input V1 one side.Because some outside power amplifier start-up circuits itself charge to audio frequency power amplifier common mode input V3 one lateral capacitance, and detect its charged state, therefore, present embodiment can not influence power amplifier common mode input V3, thereby is fit to the auxiliary start-up course of this type of outside power amplifier start-up circuit to realize guarding especially.
Second kind of preferred embodiment of the present invention be as shown in Figure 2:
High resistance sectional pressure branch road 101 comprises the first resistive network 201 that is connected in series in successively between external power source and the ground, the 3rd resistive network 203 and the second resistive network 202, owing to adopt the resistive network of MOS device can utilize littler silicon area to make the bigger resistance of equiva lent impedance, so first resistive network 201, the 3rd resistive network 203 and the second resistive network 202 include a MOS device or one group of MOS device that is connected in series, for example adopt the PMOS device, its grid links to each other with drain electrode, be connected on a side closely, its source electrode is near external power source one side, and the conducting direction in high resistance sectional pressure branch road 101 is a forward conduction.In the present embodiment, the first resistive network 201 comprises the MOS device that two connection connect, and the 3rd resistive network 203 and 202 on the second resistive network are respectively a MOS device; In addition, the 3rd resistive network 203 can also be a resistance.
Under the state of power supply power supply, two assisted bias voltages of the first resistive network 201, the 3rd resistive network 203 and the second resistive network 202 dividing potential drop output in twos.Because some outside power amplifier start-up circuits rely on audio frequency power amplifier common mode input V3 one lateral capacitance are charged, and detect its charged state, therefore, present embodiment is particularly suitable for auxiliary this type of outside power amplifier start-up circuit, promptly utilize a bias voltage that increases to influence audio frequency power amplifier common mode input V3 independently, it is slightly far away to make audio frequency power amplifier common mode input V3 depart from stable state in the moment of power amplifier start-up than audio frequency power amplifier inverting input V1, thereby triggers the work of outside power amplifier start-up circuit.
Switching network 102 can comprise first switch 301 and second switch 302, and is wherein, consistent in first kind of preferred embodiment of first switch 301 and the present invention; Second switch 302 is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, its grid is a control end, wherein, control end then receives the control signal of outside power amplifier start-up circuit output, a signal end receives an assisted bias voltage of high resistance sectional pressure branch road 101 outputs, another signal end is connected with the in-phase input end V2 of audio frequency power amplifier, and this signal end can be directly to link to each other with the in-phase input end V2 of audio frequency power amplifier, also can be to link to each other with the in-phase input end V2 of audio frequency power amplifier by resistance-capacitance network and switch in the outside power amplifier start-up circuit.Under the power amplifier resting state, second switch 302 conductings finally are implemented under the power amplifier resting state, and a bias voltage of high resistance sectional pressure branch road 101 is exported to audio frequency power amplifier in-phase input end V2 one lateral capacitance.Because some audio frequency power amplifier peripheral circuits all have separately independently resistance-capacitance network in inverting input V1 one side and in-phase input end V2 one side, therefore, the technical program is particularly suitable for auxiliary this type of audio frequency power amplifier and starts fast.
Switching network 102 also can comprise first switch 301 and the 3rd switch 303, and is wherein, consistent in first kind of preferred embodiment of first switch 301 and the present invention; The 3rd switch 303 is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, its grid is a control end, wherein, control end then receives the control signal of outside power amplifier start-up circuit output, a signal end receives an assisted bias voltage of high resistance sectional pressure branch road 101 outputs, another signal end is connected with the common mode input V3 of audio frequency power amplifier, and this signal end can be directly to link to each other with the common mode input V3 of audio frequency power amplifier, also can be to link to each other with the common mode input V3 of audio frequency power amplifier by resistance-capacitance network and switch in the outside power amplifier start-up circuit.Under the power amplifier resting state, 303 conductings of the 3rd switch finally are implemented under the power amplifier resting state, a bias voltage of high resistance sectional pressure branch road 101 is exported to audio frequency power amplifier common mode input V3 one lateral capacitance, and be its precharge, therefore, the technical program helps further shortening start-up time.
Switching network 102 also can comprise first switch 301 and resistance device 304, and is wherein, consistent in first kind of preferred embodiment of first switch 301 and the present invention; One termination of resistance device 304 is received an assisted bias voltage of high resistance sectional pressure branch road 101 outputs, the other end can directly link to each other with the common mode input V3 of audio frequency power amplifier, also can be to link to each other with the common mode input V3 of audio frequency power amplifier by resistance-capacitance network and switch in the outside power amplifier start-up circuit, finally be implemented under the power amplifier resting state, a bias voltage of high resistance sectional pressure branch road 101 is exported to power amplifier common mode input V3 one routine electric capacity.Resistance device 304 can be used as the independent RC time constant of adjusting the charging of audio frequency power amplifier common mode input one lateral capacitance, obtains a balance between quick charge and equilibrium charging; Can also be under the condition that does not have conventional peripheral power amplifier syntype bias circuit by resistance device 304, required syntype bias under the output power amplifier work state.
Switching network 102 can also comprise first switch 301 and a zero impedance branch road (not shown), and is wherein, consistent in first kind of preferred embodiment of first switch 301 and the present invention; The zero impedance branch road then is directly inputted to an assisted bias voltage of high resistance sectional pressure branch road 101 outputs the common mode input V3 of audio frequency power amplifier.The technical program can suitably be simplified circuit structure.
In the present embodiment, switching network 102 comprises first switch 301, second switch 302, the 3rd switch 303 and resistance device 304, wherein, first switch 301, second switch 302 and the 3rd switch 303 are respectively a MOS device, and the source electrode of each MOS device and drain electrode are respectively two signal ends, its grid is a control end, wherein, each control end receives the control signal of outside power amplifier start-up circuit output respectively, a signal end of signal end of first switch 301 and second switch 302 receives the same assisted bias voltage of high resistance sectional pressure branch road 101 outputs, their two signal ends in addition respectively with the inverting input V1 of audio frequency power amplifier, in-phase input end V2 connects; A signal end of the 3rd switch 303 receives another assisted bias voltage of high resistance sectional pressure branch road 101 outputs, and another signal end is connected with the common mode input V3 of audio frequency power amplifier, and resistance device 304 is connected in parallel on two signal ends of the 3rd switch 303.
In sum, the present invention can provide charging current for electric capacity in the power amplifier peripheral circuit under the audio frequency power amplifier resting state, the steady state voltage value that reduces electric capacity in the power amplifier peripheral circuit under the power amplifier resting state with operating state under gap, realize that audio frequency power amplifier starts and anti-distorsion fast.In addition, the present invention can also assist outside power amplifier start-up circuit to shorten start-up time, in some applications, also can independently finish start-up course and syntype bias required under the audio frequency power amplifier operating state is provided by instead of external power amplifier start-up circuit.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.

Claims (8)

1. auxiliary starting circuit of audio frequency power amplifier, its input is connected with external power source and outside power amplifier start-up circuit respectively, its output is connected with the input of described audio frequency power amplifier, the input of this audio frequency power amplifier comprises in-phase input end, inverting input and common mode input, it is characterized in that, described auxiliary starting circuit comprises high resistance sectional pressure branch road (101) and connected switching network (102)
Described high resistance sectional pressure branch road (101) is to the one or more assisted bias voltage of described switching network (102) output;
Described switching network (102) receives described assisted bias voltage, and outputs to the input of described audio frequency power amplifier, makes described high resistance sectional pressure branch road (101) under the power amplifier resting state, to the electric capacity charging of described audio frequency power amplifier input one side;
Described high resistance sectional pressure branch road (101) comprises the first resistive network (201) and the second resistive network (202) that is connected in series in successively between described external power source and the ground, and this first resistive network (201) and described assisted bias voltage of second resistive network (202) dividing potential drop output;
The described first resistive network (201) and the second resistive network (202) include a PMOS device or one group of PMOS device that is connected in series, the grid of described each PMOS device is connected with drain electrode, be connected on a side closely, its source electrode is near external power source one side, and the conducting direction in described high resistance sectional pressure branch road (101) is a forward conduction;
Described switching network (102) comprises first switch (301), a signal end of this first switch (301) receives an assisted bias voltage of described high resistance sectional pressure branch road (101) output, another signal end is connected with the inverting input of described audio frequency power amplifier, and the control end of first switch (301) receives the control signal of described outside power amplifier start-up circuit output.
2. auxiliary starting circuit of audio frequency power amplifier according to claim 1 is characterized in that, described first switch (301) is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
3. auxiliary starting circuit of audio frequency power amplifier according to claim 1, it is characterized in that, described switching network (102) also comprises second switch (302), a signal end of this second switch (302) receives an assisted bias voltage of described high resistance sectional pressure branch road (101) output, another signal end is connected with the in-phase input end of described audio frequency power amplifier, and the control end of second switch (302) receives the control signal of described outside power amplifier start-up circuit output.
4. auxiliary starting circuit of audio frequency power amplifier according to claim 3 is characterized in that, described second switch (302) is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
5. auxiliary starting circuit of audio frequency power amplifier according to claim 3, it is characterized in that, described switching network (102) also comprises the 3rd switch (303), a signal end of the 3rd switch (303) receives an assisted bias voltage of described high resistance sectional pressure branch road (101) output, another signal end is connected with the common mode input of described audio frequency power amplifier, and the control end of the 3rd switch (303) receives the control signal of described outside power amplifier start-up circuit output.
6. auxiliary starting circuit of audio frequency power amplifier according to claim 5 is characterized in that, described the 3rd switch (303) is a MOS device, and the source electrode of this MOS device and drain electrode are respectively two signal ends, and its grid is a control end.
7. auxiliary starting circuit of audio frequency power amplifier according to claim 3, it is characterized in that, described switching network (102) also comprises a resistance device (304), one termination of this resistance device (304) is received an assisted bias voltage of described high resistance sectional pressure branch road (101) output, the other end is connected with the common mode input of described audio frequency power amplifier, and described resistance device (304) provides syntype bias for described audio frequency power amplifier common mode input under the state of described external power source.
8. a kind of auxiliary starting circuit of audio frequency power amplifier according to claim 3, it is characterized in that, described switching network (102) also comprises a zero impedance branch road, and this zero impedance branch road is input to an assisted bias voltage of described high resistance sectional pressure branch road (101) output the common mode input of described audio frequency power amplifier.
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CN103338423B (en) * 2013-05-28 2015-12-09 上海贝岭股份有限公司 The quiet charging circuit of a kind of D class audio frequency power amplifier
CN103607681A (en) * 2013-11-15 2014-02-26 上海贝岭股份有限公司 An audio frequency power amplifier starting charging circuit and a method
CN114024514B (en) * 2021-10-25 2023-10-24 电子科技大学 Over-neutralization amplifier structure with series lossy embedded network
CN116683906B (en) * 2023-08-04 2024-01-26 深圳飞骧科技股份有限公司 BG starting circuit and radio frequency chip

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1797949A (en) * 2004-12-29 2006-07-05 普诚科技股份有限公司 Mute circuit of audio frequency amplifier
CN1835393A (en) * 2005-03-07 2006-09-20 美国芯源系统股份有限公司 Audio amplifier with high power and high efficiency

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1797949A (en) * 2004-12-29 2006-07-05 普诚科技股份有限公司 Mute circuit of audio frequency amplifier
CN1835393A (en) * 2005-03-07 2006-09-20 美国芯源系统股份有限公司 Audio amplifier with high power and high efficiency

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开2008-148147A 2008.06.26

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