CN100566160C - Message amplifying unit and prevent the method for sonic boom - Google Patents
Message amplifying unit and prevent the method for sonic boom Download PDFInfo
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- CN100566160C CN100566160C CNB2006101685694A CN200610168569A CN100566160C CN 100566160 C CN100566160 C CN 100566160C CN B2006101685694 A CNB2006101685694 A CN B2006101685694A CN 200610168569 A CN200610168569 A CN 200610168569A CN 100566160 C CN100566160 C CN 100566160C
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Abstract
A kind of message amplifying unit is applicable to a message Play System, and this message Play System has a message source, an isolated electric capacity and a load.It comprises a power amplifier circuit and a control unit.Power amplifier circuit is coupled to the message source, to receive the message that the message source is produced.Power amplification circuit has the power that amplifies message, and by isolated electric capacity, export the message that is exaggerated to load, this power amplification circuit comprises a bias circuit unit, and this bias circuit unit is in order to produce the positive and negative Dc bias point of this power amplifier circuit.Control unit is coupled to power amplifier circuit, and when message amplifying unit started, if when the bias value of this power amplifier circuit output message is lower than a predetermined potential, control unit was set at category-A with the class of operation of power amplifier circuit; When the bias value of power amplifier circuit output message reached predetermined potential, control unit then was set at the AB class with the class of operation of power amplifier circuit.
Description
Technical field
The present invention refers to that especially a kind of tool prevents the message amplifying unit of sonic boom function, and prevents the method for sonic boom about a kind of message amplifying unit.
Background technology
Generally speaking, the message Play System can be divided into three major types in order to the framework that amplifies message power, is respectively single-ended (Single-ended), bridge-type load (Bridge-tied-load) and whole differential amplification systems such as (Fully differential).Wherein, single-ended message amplification system is used for promoting the load of earphone class more.See also Fig. 1, this figure is the configuration diagram of a typical message Play System.Among Fig. 1, message Play System 1 amplifies framework for monofocal, in this message Play System 1, the inside of message amplifying unit 10 is provided with power amplifier (Power amplifier), in order to receive first message 14 that message source 11 is produced, and it is enlarged into the output of second message 15, and thereafter, again by coupling capacitance C
AC1The Dc bias of isolated second message 15 transfers to load 12 with AC coupled message 16 and plays.
Then, see also Fig. 2 A and Fig. 2 B, this two figure is respectively the voltage schematic diagram of second message 15 and AC coupled message 16.Shown in Fig. 2 A and Fig. 2 B, (time among the figure was T when message amplifying unit 10 started
1The place), current potential moment of second message 15 is changed operating potential into from zero volt, and this instantaneous voltage changes and caused 16 moments of AC coupled message potential pulse to occur, and then causes load 12 to produce sonic boom (Pop) phenomenons.Similarly, when message amplifying unit 10 is closed, the sonic boom phenomenon also will take place.This sonic boom phenomenon not only makes the user not feel well, simultaneously also can accelerating weight 12 aging with associated loop, shorten its useful life.Therefore, how to prevent the problem that the frequent think of of designer reaches that is produced as of sonic boom.
At present, the bias voltage climbing speed of dealer by control amplifier with the instantaneous transformation of the voltage of preventing, thereby avoided the generation of sonic boom.See also Fig. 3, this figure is the system architecture schematic diagram that a prior art tool sonic boom prevents the message Play System of function.In the message Play System 2 of Fig. 3, message amplifying unit 20 has a power amplifier AMP10.The reference voltage input terminal of power amplifier AMP10 is connected with a bypass capacitor C
BYPASSThis shunt capacitance C
BYPASSWith formation supply voltage V among the power amplifier AMP10
DD/ 2 high-impedance resistors bleeder circuit will form a RC time constant, to eliminate the instantaneous transformation of voltage, avoid load 22 to produce sonic boom.
In the above-mentioned prior art, by shunt capacitance C
BYPASSWith the bias point that relevant divider resistance comes control amplifier, make its system that slowly reaches operating potential can avoid the generation of sonic boom.Above-mentioned message amplifying unit is designed among the integrated circuit (IC) chip usually, and in order to realize preventing the purpose of sonic boom, integrated circuit (IC) chip must plug-in shunt capacitance C
BYPASSIn addition, this system needs to reach the operating point of amplifier AMP10 the quite long beginning in charging interval.The inventor is because the defective of above-mentioned prior art, thereby proposes a kind of new design concept.Be different from the voltage control system of prior art, the present invention is based on current control system and prevent the sonic boom phenomenon.The present invention also can improve the long defective of amplifier opening time of prior art except can effectively avoiding the sonic boom phenomenon.
Summary of the invention
The object of the present invention is to provide a kind of message amplifying unit and sonic boom thereof to prevent method, it comes the class of operation of switched power amplifier circuit by control unit, can when preventing that sonic boom from producing, make the bias value of power amplifier circuit output message reach predetermined potential fast.
The present invention discloses a kind of message amplifying unit, and it is applicable to a message Play System.This message Play System has a message source, an isolated electric capacity and a load.This message amplifying unit comprises a power amplifier circuit and a control unit.This power amplifier circuit is coupled to this message source, to receive the message that this message source is produced.This power amplification circuit is in order to amplify the power of this message, and by completely cutting off electric capacity, export this message that is exaggerated power to this load, this power amplification circuit comprises a bias circuit unit, and this bias circuit unit is in order to produce the positive and negative Dc bias point of this power amplifier circuit.This control unit is coupled to this power amplifier circuit, and according to the bias value of this power amplifier circuit output message, switches the class of operation of this power amplifier circuit.When this message amplifying unit started, if when the bias value of this power amplifier circuit output message is lower than a predetermined potential, this control unit was set at category-A with the class of operation of this power amplifier circuit; When the bias value of this power amplifier circuit output message reached this predetermined potential, this control unit then was set at the AB class with the class of operation of this power amplifier circuit.
The present invention more discloses a kind of message Play System, and this message Play System comprises a message source, isolated electric capacity, a load and a message amplifying unit.This message source is in order to produce a message.This load coupled is in this isolated electric capacity.This message amplifying unit comprises a power amplifier circuit and a control unit.This power amplifier circuit is coupled to this message source, to receive this message.This power amplification circuit is in order to amplify the power of this message, and by completely cutting off electric capacity, export this message that is exaggerated power to this load, this power amplification circuit comprises a bias circuit unit, and this bias circuit unit is in order to produce the positive and negative Dc bias point of this power amplifier circuit.This control unit is coupled to this power amplifier circuit, and according to the bias value of this power amplifier circuit output message, switches the class of operation of this power amplifier circuit.When this message amplifying unit started, if when the bias value of this power amplifier circuit output message is lower than a predetermined potential, this control unit was set at category-A with the class of operation of this power amplifier circuit; When the bias value of this power amplifier circuit output message reached this predetermined potential, this control unit then was set at the AB class with the class of operation of this power amplifier circuit.
The present invention discloses the method that a kind of message amplifying unit prevents sonic boom in addition, it is applicable to a message amplifying unit, this message amplifying unit has a power amplification circuit, wherein this power amplification circuit is in order to input and amplify a message, the step of this method at first, start this power amplification circuit, and the class of operation of this power amplifier circuit is set at category-A.Provide one slow to rise current source, when power amplifier circuit started, the output current of controlling this power amplifier circuit rises to gradually decided electric current.Secondly, judge whether the bias value of this power amplifier circuit output reaches a predetermined potential.At last, if when the bias value of this power amplifier circuit output reaches this predetermined potential, the class of operation of this power amplifier circuit is switched to the AB class, to amplify the power of this message.
By above technical characterictic, when learning that beneficial effect performance of the present invention is as follows:
Disclosed message amplifying unit and prevent the class of operation of sonic boom method based on the control power amplifiers circuit, with when preventing that sonic boom from producing, make the bias value of power amplifier circuit output message rapidly increase to predetermined potential, to enter the work of normal amplification message power.And message amplifying unit of the present invention more provides one slow rise current source and control its output current, may produce the factor of sonic boom phenomenon with further inhibition.In addition, discharge cell can prevent further that the message amplifying unit dwell period from producing sonic boom.Compared to defectives such as the message amplifying unit of prior art must plug-in shunt capacitances and the voltage rise time is tediously long, the present invention provides reliable and efficient improvement scheme with different version.
Above general introduction and ensuing detailed description and accompanying drawing all are to reach mode, means and the effect that predetermined purpose is taked in order to further specify the present invention.And relevant other purpose of the present invention and advantage will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the system architecture schematic diagram of a typical message Play System;
Fig. 2 A and Fig. 2 B are the voltage schematic diagram of second message and the AC coupled message of Fig. 1;
Fig. 3 is the configuration diagram that a prior art tool sonic boom prevents the message Play System of function;
Fig. 4 is the configuration diagram of disclosed message amplifying unit and message Play System;
Fig. 5 is the circuit diagram of disclosed message amplifying unit and message Play System;
Fig. 6 is the slow circuit diagram that rises current source of the present invention;
Fig. 7 is the flow chart of steps that prevents the sonic boom method of disclosed message amplifying unit; And
Fig. 8 is the message amplifying unit output end voltage value of Fig. 5 and the voltage schematic diagram of load voltage.
Symbol description among the figure
1,2,3: the message Play System
10,20,30: message amplifying unit
11,21,31: the message source
12,22,32: load
14: the first message
15: the second message
16: AC coupled message
300: power amplifier circuit
302: control unit
304: the quiescent current control unit
305: the bias circuit unit
306: the slow current source that rises
307: comparing unit
308: discharge cell
AMP1, AMP10: amplifier
C
1, C
5, C
AC1, C
AC2, C
AC3, C
BYPASS: electric capacity
R
1, R
2, R
3, R
5: resistance
Q
P1、Q
P31、Q
P32Q
N1、Q
N2、Q
N31、Q
N51、Q
N52、Q
N53、Q
N54、Q
N55：
Transistor
SW1, SW2: diverter switch
I
S: current source
CTRL: controlling signal
Embodiment
At first, see also Fig. 4, this figure is the configuration diagram of disclosed message amplifying unit and message Play System.As shown in Figure 4, a message Play System 3 has a message source 31, a message amplifying unit 30, one isolated capacitor C
AC3An and load 32.Message amplifying unit 30 is arranged among the message Play System 3, and has a power amplifier circuit 300 and a control unit 302.
See also Fig. 5, this figure is the message amplifying unit 30 of Fig. 4 and the circuit diagram of message Play System 3, and wherein message amplifying unit 30 has comprised the interlock circuit schematic diagram of power amplifier circuit 300 and control unit 302.As shown in Figure 5, power amplifier circuit 300 has an input stage amplifier AMP1, a PMOS transistor Q
P1, a nmos pass transistor Q
N1The input of input stage amplifier AMP1 is in order to being connected in message source 31, and with voltage PB, NB as its positive and negative Dc bias point.Power amplifier circuit 300 has a bias circuit unit 305, and this bias circuit unit 305 has shown the generation circuit of above-mentioned positive and negative Dc bias point PB, NB.Again, power amplifier circuit 300 also comprises a quiescent current control unit (Quiescentcurrent controller) 304, and it is in order to provide power amplifier circuit 300 output signal Dc biases.Again, the circuit structure of this quiescent current control unit 304 does not just remake at this and gives unnecessary details for having now.
Among Fig. 5, control unit 302 has comprised a comparing unit 307 and two diverter switch SW1, SW2, and diverter switch SW1, SW2 have controlled transistor Q respectively
P1, Q
N1The connection state of gate terminal is with the class of operation of switched power amplifier circuit 300.Comparing unit 307 is in order to compare end points transistor Q
N1The current potential of the current potential of gate terminal end points NOB and power amplifier circuit 300 bias point NB, exporting a controlling signal CTRL, among the controlling signal CTRL may command diverter switch SW1, Q
P1Grid be connected end points SA or be connected in end points SB, end points SA is connected in the Dc bias point of power amplifier circuit 300, and end points SB is connected in the output of input stage amplifier AMP1.This comparing unit 307 can comprise a comparator circuit, to realize above-mentioned current potential comparison system.Again, message amplifying unit 30 more comprises a discharge cell 308, and this discharge cell 308 is coupled to the output of power amplifier circuit 300, the transistor Q of discharge cell 308
N2Only beginning conducting when message amplifying unit 30 is closed.
Just by the circuit structure of Fig. 5, describe message amplifying unit 30 in detail at this in the operation system that sonic boom produces that prevents of startup with dwell period.
At first, in the open stage of message amplifying unit 30, its operating system that prevents that sonic boom from producing comprises following two steps:
First step: when power amplifier circuit 300 started, diverter switch SW1 was with transistor Q
P1Grid be connected end points SA, simultaneously, diverter switch SW2 is with transistor Q
N1Grid be connected end points SN, make power amplifier circuit 300 operate in category-A, to decide electric current to isolated capacitor C
AC3Charging; And
Second step: as transistor Q
N1When the current potential of gate terminal end points NOB is higher than the bias point NB current potential of power amplifier circuit 300, promptly represent power amplifier circuit 300 reached designing institute must predetermined potential (be the common-mode voltage V of power amplifier circuit 300
Cm).At this moment, comparing unit 307 may command diverter switch SW1 are with transistor Q
P1Grid switch to end points SB by end points SA, make power amplifier circuit 300 operate in the AB class, to amplify the work of message power normally.
Again, the inventor decides electric current to isolated capacitor C in view of when power amplifier circuit 300 operates in category-A if moment provides
AC3Charging still can cause voltage V
LoadProduce small current potential and beat, thereby cause load 32 to have the possibility that produces sonic boom.Therefore, in bias circuit unit 305, be provided with one and slow rise current source (Slow ramp-up current source) 306, make start after, power amplifier circuit 300 is exported the bias value V of message
OutSlowly rise, to suppress the possible factor that sonic boom produces.
See also Fig. 6, this figure is disclosed slow one of current source 306 practical circuit that rises.As shown in Figure 6, this is slow, and to rise current source 306 be a current mirroring circuit (Current mirror), and it passes through wherein transistor Q
N52Resistance R that grid connected 5 and capacitor C 5 are controlled the current potential V of its drain
1Slowly rise, and then oxide-semiconductor control transistors Q
N51Grid-source voltage V
GsAfter the start, image current I
OutOutput valve is increased with the charging interval control of capacitor C 5 gradually by resistance R 5, thereby the positive and negative bias point voltage of control bias circuit unit 305 also slowly rises, and the electric current that power amplifier circuit 300 is exported increases to certain electric current gradually by zero.We can control herein current rise time by firmware, make it reach optimization.
Secondly, in the dwell period of message amplifying unit 30, message amplifying unit 30 prevents that the operating system of sonic boom generation is as follows:
When power amplifier circuit 300 was closed, diverter switch SW1, SW2 were respectively with transistor Q
P1, Q
N2Grid be connected in end points PD, to close transistor Q
P1, Q
N2For fear of voltage V
OutCurrent potential descend suddenly, cause the voltage V of load 32
LoadSurging occurs and cause the generation of sonic boom, at this moment, message amplifying unit 30 turn-on transistor Q
N2, make resistance R 2 and isolated capacitor C
AC3Form discharge loop, with the magnitude of voltage V of the output that reduces message amplifying unit 30 gradually
Out, prevent that load 32 from producing sonic boom in the dwell period of message amplifying unit 30.
See also Fig. 7, this figure is the flow chart of steps that disclosed message amplifying unit prevents the sonic boom method.Wherein Xiang Guan system architecture is please consulted Fig. 5, Fig. 6 simultaneously.As shown in Figure 7, the method comprises the following steps:
At first, starting power amplifier circuit 300, control unit 302 is set at category-A (step S700) with the class of operation of power amplifier circuit 300;
Secondly, control unit 302 and judge the bias value V of power amplifier circuit 300 outputs
OutWhether reach predetermined potential (step S702); And
At last, if the voltage V of power amplifier circuit 300 output signals
OutWhen reaching predetermined potential, control unit 302 switches to the AB class with the class of operation of power amplifier circuit 300, to amplify the power (step S704) of message.
This message amplifying unit 30 more comprises provides a discharge cell 308, and discharge cell 308 is coupled to the output of power amplifier circuit 300.In the above-mentioned method, more comprise, then start the step of this discharge cell 308 if this power amplifier circuit 300 is closed.
Among the step S700 that prevents the sonic boom method of the invention described above, comprise a more slow current source 306 that rises is provided that with when power amplifier circuit 300 starts, the output current of control power amplifiers circuit 300 rises to the step of deciding electric current gradually.
At last, see also Fig. 8, this figure is the output end voltage V of the message Play System 3 of Fig. 5
OutWith load 32 voltage V
LoadThe voltage schematic diagram.As shown in Figure 8, the time is in t
0～t
3The interval is the open stage of power amplifier circuit 300, and the time is in t
3～t
4The interval is the dwell period of power amplifier circuit 300.
When the time in t
0～t
2When interval, power amplifier circuit 300 operates in category-A, wherein t
0～t
1Interval utilization is slow to rise current source 306 control power amplifiers circuit 300, makes its output current slowly increase to the time in t
1The time reach certain electric current.And the time is in t
1～t
2When interval, power amplifier circuit 300 operates in category-A, at this moment, and voltage V
LoadThe linear rising, power amplifier circuit 300 have been decided electric current to isolated capacitor C
AC3Charging.Time is in t
2～t
3When interval, power amplifier circuit 300 operates in the AB class, load 32 voltage V
LoadThe order of convergence section.When power amplifier circuit 300 operate in the AB class after, can normally amplify the power of message, and the voltage V of load 32
LoadAlso converge to zero potential gradually.At last, when the time in t
3～t
4When interval, message amplifying unit 30 is a dwell period, its output end voltage V
OutSlowly descend via resistance R 2 formed discharge loops.
The above, it only is the detailed description of specific embodiments of the invention and graphic, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with described claim, anyly be familiar with this skill person in the field of the invention, can think easily and variation or modify and all can be encompassed in the claim that the present invention defines.
Claims (19)
1. a message amplifying unit is characterized in that, is applicable to a message Play System, and this message Play System has a message source, an isolated electric capacity and a load, and this message amplifying unit comprises:
One power amplifier circuit, be coupled to this message source, to receive the message that this message source is produced, this power amplification circuit is in order to amplify the power of this message, and by completely cutting off electric capacity, export this message that is exaggerated power to this load, this power amplification circuit comprises a bias circuit unit, and this bias circuit unit is in order to produce the positive and negative Dc bias point of this power amplifier circuit; And
One control unit is coupled to this power amplifier circuit, and this control unit switches the class of operation of this power amplifier circuit according to the bias value of this power amplifier circuit output message;
Wherein when this message amplifying unit starts, when if the bias value of this power amplifier circuit output message is lower than a predetermined potential, this control unit is set at category-A with the class of operation of this power amplifier circuit, when the bias value of this power amplifier circuit output message reached this predetermined potential, this control unit then was set at the AB class with the class of operation of this power amplifier circuit.
2. message amplifying unit as claimed in claim 1 is characterized in that, this power amplification circuit comprises an input stage amplifier, a PMOS transistor and a nmos pass transistor, and this input stage amplifier is coupled to this message source, to import this message.
3. message amplifying unit as claimed in claim 2, it is characterized in that, when this power amplification circuit started, the transistorized gate terminal of this PMOS was accepted the control of this control unit, with the output that is coupled to this input stage amplifier or the positively biased pressure point of this power amplifier circuit.
4. message amplifying unit as claimed in claim 3 is characterized in that, this control unit comprises:
One comparing unit is according to the comparison of the gate terminal potential value of the negative bias pressure point potential value of this power amplification circuit and this nmos pass transistor, to export a controlling signal; And
One switches switch, according to this controlling signal, controls the transistorized gate terminal of this PMOS and is coupled to the output of this input stage amplifier or the positively biased pressure point of this power amplifier circuit.
5. message amplifying unit as claimed in claim 2 is characterized in that, when this power amplification circuit started, the gate terminal of this nmos pass transistor was accepted the control of this control unit, to be coupled to the output of this input stage amplifier.
6. message amplifying unit as claimed in claim 1 is characterized in that, this bias circuit unit comprises a slow current source that rises.
7. message amplifying unit as claimed in claim 6 is characterized in that, this is slow, and to rise current source be a current mirroring circuit.
8. message amplifying unit as claimed in claim 6 is characterized in that, this is slow to rise current source and comprise resistance and an electric capacity, and this resistance and this electric capacity delay the rise time of the output current that rises current source in order to determine this.
9. message amplifying unit as claimed in claim 1 is characterized in that, more comprises a discharge cell, and this discharge cell is coupled to the output of this power amplification circuit.
10. a message Play System is characterized in that, comprising:
One message source is in order to produce a message;
One isolated electric capacity;
One load is coupled to this isolated electric capacity; And
One message amplifying unit comprises:
One power amplifier circuit, be coupled to this message source, to receive the message that this message source is produced, this power amplification circuit is in order to amplify the power of this message, and by completely cutting off electric capacity, export this message that is exaggerated power to this load, this power amplification circuit comprises a bias circuit unit, and this bias circuit unit is in order to produce the positive and negative Dc bias point of this power amplifier circuit; And
One control unit is coupled to this power amplifier circuit, and this control unit switches the class of operation of this power amplifier circuit according to the bias value of this power amplifier circuit output message;
Wherein when this message amplifying unit starts, when if the bias value of this power amplifier circuit output message is lower than a predetermined potential, this control unit is set at category-A with the class of operation of this power amplifier circuit, when the bias value of this power amplifier circuit output message reached this predetermined potential, this control unit then was set at the AB class with the class of operation of this power amplifier circuit.
11. message Play System as claimed in claim 10 is characterized in that, this power amplification circuit comprises an input stage amplifier, a PMOS transistor and a nmos pass transistor, and this input stage amplifier is coupled to this message source.
12. message Play System as claimed in claim 11, it is characterized in that, when this power amplification circuit started, the transistorized gate terminal of this PMOS was accepted the control of this control unit, with the output that is coupled to this input stage amplifier or the positively biased pressure point of this power amplifier circuit.
13. message Play System as claimed in claim 12 is characterized in that, this control unit comprises:
One comparing unit is according to the comparison of the gate terminal potential value of the negative bias pressure point potential value of this power amplification circuit and this nmos pass transistor, to export a controlling signal; And
One switches switch, according to this controlling signal, controls the transistorized gate terminal of this PMOS and is coupled to the output of this input stage amplifier or the positively biased pressure point of this power amplifier circuit.
14. message Play System as claimed in claim 11 is characterized in that, when this power amplification circuit started, the gate terminal of this nmos pass transistor was accepted the control of this control unit, to be coupled to the output of this input stage amplifier.
15. message Play System as claimed in claim 10 is characterized in that, this bias circuit unit comprises a slow current source that rises.
16. message Play System as claimed in claim 15, it is characterized in that, should slow rise current source is an electric current claim the 17 described message Play Systems, it is characterized in that this slow rise current source and comprise resistance and an electric capacity, this resistance and this electric capacity delay the rise time of the output current that rises current source in order to determine this.
17. message Play System as claimed in claim 10 is characterized in that this message amplifying unit more comprises a discharge cell, this discharge cell is coupled to the output of this power amplification circuit.
18. a message amplifying unit prevents the method for sonic boom, is applicable to a message amplifying unit, this message amplifying unit has a power amplification circuit, and wherein this power amplification circuit is characterized in that in order to import and to amplify a message, comprises the following steps:
Start this power amplification circuit, and the class of operation of this power amplifier circuit is set at category-A;
Provide one slow to rise current source, when power amplifier circuit started, the output current of controlling this power amplifier circuit rises to gradually decided electric current;
Whether the bias value of judging this power amplifier circuit output reaches a predetermined potential; And
When if the bias value of this power amplifier circuit output reaches this predetermined potential, the class of operation of this power amplifier circuit is switched to the AB class, to amplify the power of this message.
19. method as claimed in claim 18, it is characterized in that this message amplifying unit more comprises a discharge cell, this discharge cell is coupled to the output of this power amplifier circuit, this method more comprises if this power amplifier circuit is closed, then starts the step of this discharge cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101685694A CN100566160C (en) | 2006-12-21 | 2006-12-21 | Message amplifying unit and prevent the method for sonic boom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101685694A CN100566160C (en) | 2006-12-21 | 2006-12-21 | Message amplifying unit and prevent the method for sonic boom |
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| CN101207376A CN101207376A (en) | 2008-06-25 |
| CN100566160C true CN100566160C (en) | 2009-12-02 |
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| CNB2006101685694A Active CN100566160C (en) | 2006-12-21 | 2006-12-21 | Message amplifying unit and prevent the method for sonic boom |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742381A (en) * | 2009-11-23 | 2010-06-16 | 北京中星微电子有限公司 | Denoising drive circuit and method |
| CN102065352B (en) * | 2010-11-08 | 2014-09-10 | 中兴通讯股份有限公司 | Device and method for eliminating POP noise of CAPLESS audio power amplifier |
| CN102572629A (en) * | 2010-12-10 | 2012-07-11 | 炬力集成电路设计有限公司 | Circuit for suppressing POP sound in earphone, and earphone |
| CN102006018B (en) * | 2010-12-27 | 2013-05-15 | 上海贝岭股份有限公司 | Opening control circuit used for AB class audio amplifier |
| CN103533484A (en) * | 2012-07-03 | 2014-01-22 | 安凯(广州)微电子技术有限公司 | Rapid noise elimination circuit |
| CN106208973B (en) * | 2016-08-24 | 2017-06-30 | 叶鼎 | Servo-actuated in advance biasing means and the amplifier of a kind of A genus audio power amplifiers |
| CN115132163B (en) * | 2022-06-22 | 2023-07-11 | 锐宸微(上海)科技有限公司 | Audio playing device and starting method thereof |
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| US6396933B1 (en) * | 1997-02-24 | 2002-05-28 | Korea Advanced Institute Of Science And Technology | High-fidelity and high-efficiency analog amplifier combined with digital amplifier |
| CN1457144A (en) * | 2002-05-10 | 2003-11-19 | 沃福森微电子有限公司 | Transient-inhibiting audio-frequency circuit and method |
| US20060222183A1 (en) * | 2005-03-29 | 2006-10-05 | Sony Corporation | Audio signal amplifying apparatus and distortion correcting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396933B1 (en) * | 1997-02-24 | 2002-05-28 | Korea Advanced Institute Of Science And Technology | High-fidelity and high-efficiency analog amplifier combined with digital amplifier |
| CN1457144A (en) * | 2002-05-10 | 2003-11-19 | 沃福森微电子有限公司 | Transient-inhibiting audio-frequency circuit and method |
| US20060222183A1 (en) * | 2005-03-29 | 2006-10-05 | Sony Corporation | Audio signal amplifying apparatus and distortion correcting method |
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| CN101207376A (en) | 2008-06-25 |
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