CN202334444U - Adjustable-gain audio power amplifying circuit - Google Patents
Adjustable-gain audio power amplifying circuit Download PDFInfo
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- CN202334444U CN202334444U CN2011204221842U CN201120422184U CN202334444U CN 202334444 U CN202334444 U CN 202334444U CN 2011204221842 U CN2011204221842 U CN 2011204221842U CN 201120422184 U CN201120422184 U CN 201120422184U CN 202334444 U CN202334444 U CN 202334444U
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Abstract
The utility model discloses an adjustable-gain audio power amplifying circuit, which comprises an input unit, an audio amplifying unit, a gain adjusting unit, a control unit, a comparing unit and an output unit, wherein the audio amplifying unit is connected with the input unit; the gain adjusting unit is connected with the audio amplifying unit; the control unit is connected with the gain adjusting unit; the comparing unit is connected between the gain adjusting unit and the control unit; the output unit is connected with the audio amplifying unit; the comparing unit is used for comparing an output signal of the output unit with a common-mode reference voltage, and outputting a gain adjusting control signal to the control unit; the gain adjusting control signal is overturned when the output signal of the output unit is equal to the common-mode reference voltage; the control unit is used for transmitting a received gain adjusting signal to the gain adjusting unit when detecting that the gain adjusting control signal is overturned; and the gain adjusting unit is used for controlling the gain of the adjustable-gain audio power amplifying circuit according to the received gain adjusting signal. The adjustable-gain audio power amplifying circuit has a simple structure, and crack generated by gain adjustment is suppressed.
Description
Technical field
The utility model relates to a kind of amplifying circuit, refers to a kind of adjustable gain audio power amplifying circuit with zero passage detection function especially.
Background technology
In audio power amplifying circuit, in the time will carrying out gain-adjusted, tend to make the output signal generation saltus step of audio power amplifying circuit, so just easily loudspeaker or earphone are impacted and produce crack, and make responsive ear very uncomfortable.Prior art sound intermediate frequency power amplification circuit as shown in Figure 1 is when carrying out gain-adjusted, and the simulation waveform of output signal this shows that tangible saltus step has taken place the output signal.
Therefore, be necessary to provide a kind of adjustable gain audio power amplifying circuit that can effectively suppress the crack of gain-adjusted generation, make that when carrying out gain-adjusted the output signal of audio power amplifying circuit saltus step can not take place.
Summary of the invention
In view of above content, be necessary to provide a kind of adjustable gain audio power amplifying circuit with zero passage detection function.
A kind of adjustable gain audio power amplifying circuit; Said adjustable gain audio power amplifying circuit comprises that control unit, that gain adjustment unit, that audio amplification unit, that an input unit, links to each other with said input unit links to each other with said audio amplification unit links to each other with said gain adjustment unit is connected in the output unit that said gain adjustment unit and comparing unit and between the said control unit link to each other with said audio amplification unit; Said comparing unit compares the output signal and a common mode reference voltage of said output unit; And export a gain-adjusted and control signal to said control unit; Said gain-adjusted control signal is overturn when the output signal of said output unit equates with said common mode reference voltage; Said control unit detects when upset takes place said gain-adjusted control signal; A gain-adjusted signal that receives is sent to said gain adjustment unit, and said gain adjustment unit is according to the gain of the said adjustable gain audio power amplifying circuit of gain-adjusted signal controlling that receives.
Preferably; Said input unit comprises second resistance that first resistance and one that a first input end, one second input, link to each other with said first input end links to each other with said second input; Said audio amplification unit is an audio frequency amplifier, and said gain adjustment unit comprises one first adjustable resistance and one second adjustable resistance, and said control unit is a gain controller; Said comparing unit is a zero passage detection comparator, and said output unit is an output.
Preferably; Said first input end links to each other with an end of said first resistance; The other end of said first resistance links to each other with an inverting input of said audio frequency amplifier and an end of said first adjustable resistance; Said second input links to each other with an end of said second resistance, and the other end of said second resistance links to each other with a normal phase input end of said audio frequency amplifier and an end of said second adjustable resistance.
Preferably; One output of the other end of said first adjustable resistance, said audio frequency amplifier, a normal phase input end of said zero passage detection comparator are connected with said output jointly; The other end of said second adjustable resistance links to each other with an inverting input of said zero passage detection comparator, and receives said common mode reference voltage jointly.
Preferably; One output of said zero passage detection comparator links to each other with the control end of said gain controller; The input of said gain controller receives said gain-adjusted signal, and the output of said gain controller links to each other with the control end of said first adjustable resistance and the control end of said second adjustable resistance.
A kind of adjustable gain audio power amplifying circuit; Said adjustable gain audio power amplifying circuit comprises that control unit, that gain adjustment unit, that audio amplification unit, that an input unit, links to each other with said input unit links to each other with said audio amplification unit links to each other with said gain adjustment unit is connected in the output unit that said input unit and comparing unit and between the said control unit link to each other with said audio amplification unit; Said comparing unit compares a pair of differential signal of said input unit input; And export a gain-adjusted and control signal to said control unit; Said gain-adjusted control signal is overturn when the differential signal of said input unit input equates; Said control unit detects when upset takes place said gain-adjusted control signal; A gain-adjusted signal that receives is sent to said gain adjustment unit, and said gain adjustment unit is according to the gain of the said adjustable gain audio power amplifying circuit of gain-adjusted signal controlling that receives.
Preferably; Said input unit comprises second resistance that first resistance and one that a first input end, one second input, link to each other with said first input end links to each other with said second input; Said audio amplification unit is an audio frequency amplifier, and said gain adjustment unit comprises one first adjustable resistance and one second adjustable resistance, and said control unit is a gain controller; Said comparing unit is a zero passage detection comparator, and said output unit is an output.
Preferably; Said first input end links to each other with an end of said first resistance and a normal phase input end of said zero passage detection comparator; The other end of said first resistance links to each other with an inverting input of said audio frequency amplifier and an end of said first adjustable resistance; Said second input links to each other with an end of said second resistance and an inverting input of said zero passage detection comparator, and the other end of said second resistance links to each other with a normal phase input end of said audio frequency amplifier and an end of said second adjustable resistance.
Preferably, an output of the other end of said first adjustable resistance, said audio frequency amplifier is connected with said output jointly, and the other end of said second adjustable resistance connects a common mode reference voltage terminal.
Preferably; One output of said zero passage detection comparator links to each other with the control end of said gain controller; The input of said gain controller receives said gain-adjusted signal, and the output of said gain controller links to each other with the control end of said first adjustable resistance and the control end of said second adjustable resistance.
Relative prior art; The utility model adjustable gain audio power amplifying circuit is when carrying out gain-adjusted to audio power amplifying circuit; Saltus step can not take place in the output signal of audio power amplifying circuit, and is simple in structure, and effectively suppressed the crack that gain-adjusted produces.
Description of drawings
Fig. 1 is the simulation waveform of prior art sound intermediate frequency power amplification circuit output signal.
Fig. 2 is the system block diagram of the utility model adjustable gain audio power amplifying circuit preferred embodiments.
Fig. 3 is the circuit diagram of the utility model adjustable gain audio power amplifying circuit preferred embodiments.
Fig. 4 is the system block diagram of another execution mode of the utility model adjustable gain audio power amplifying circuit.
Fig. 5 is the circuit diagram of another execution mode of the utility model adjustable gain audio power amplifying circuit.
Fig. 6 is the simulation waveform of the utility model adjustable gain audio power amplifying circuit preferred embodiments output signal.
Embodiment
See also Fig. 2 and Fig. 3, the utility model adjustable gain audio power amplifying circuit preferred embodiments comprises that control unit, that gain adjustment unit, that audio amplification unit, that an input unit, links to each other with this input unit links to each other with this audio amplification unit links to each other with this gain adjustment unit is connected in the output unit that this gain adjustment unit and comparing unit and between this control unit link to each other with this audio amplification unit.Wherein, this input unit comprises a first input end Vinn, one second input Vinp, one first resistance R 11 and one second resistance R 12; This audio amplification unit is an audio frequency amplifier PA; This gain adjustment unit comprises one first adjustable resistance RF1 and one second adjustable resistance RF2; This control unit is a gain controller CTRL; This comparing unit is a zero passage detection comparator C OM; This output unit is an output end vo ut.
This input unit is used to import a pair of differential signal; This audio amplification unit is used to loudspeaker or earphone provides enough driving forces; This comparing unit is used for the output signal of this output unit and a common mode reference voltage V REF are compared; And export a gain-adjusted and control signal to this control unit; When the output signal of output unit equates with common mode reference voltage V REF, this gain-adjusted control signal will be overturn; This control unit is used to receive the gain-adjusted signal DB_IN of an input, and detects when upset takes place the gain-adjusted control signal of comparing unit output, and DB_IN is sent to this gain adjustment unit with the gain-adjusted signal; This gain adjustment unit is according to the gain of the gain-adjusted signal DB_IN control audio power amplification circuit that receives.
Because the finite gain of zero passage detection comparator C OM and the influence of input offset voltage; When the gain of audio power amplifying circuit is adjusted to very little the time; For example-during 40dB; The amplitude output signal of audio power amplifying circuit is very little, and this moment, the gain-adjusted control signal of zero passage detection comparator C OM output can not overturn, and audio power amplifying circuit is to carry out gain-adjusted according to the upset of the gain-adjusted control signal of zero passage detection comparator C OM output; Therefore in this case, gain-adjusted can lose efficacy.Therefore; This gain controller CTRL also can count the gain-adjusted control signal of zero passage detection comparator C OM output; When the gain-adjusted control signal long-time (for example 25 milliseconds) that detects zero passage detection comparator C OM output as gain controller CTRL does not take place to overturn; To close zero passage detection comparator C OM automatically, thereby avoid gain-adjusted to lose efficacy.
The circuit connecting relation of the utility model adjustable gain audio power amplifying circuit preferred embodiments is following: this first input end Vinn links to each other with an end of this first resistance R 11, and the other end of this first resistance R 11 links to each other with the inverting input of this audio frequency amplifier PA and the end of this first adjustable resistance RF1.This second input Vinp links to each other with an end of this second resistance R 12, and the other end of this second resistance R 12 links to each other with the normal phase input end of this audio frequency amplifier PA and the end of this second adjustable resistance RF2.The normal phase input end of the other end of this first adjustable resistance RF1, the output of this audio frequency amplifier PA, this zero passage detection comparator C OM is connected with this output end vo ut jointly.The other end of this second adjustable resistance RF2 links to each other with the inverting input of this zero passage detection comparator C OM, and receives common mode reference voltage V REF jointly.The output of this zero passage detection comparator C OM links to each other with the control end of this gain controller CTRL; The input of this gain controller CTRL is used to receive the gain-adjusted signal DB_IN of input, and the output of this gain controller CTRL links to each other with the control end of this first adjustable resistance RF1 and the control end of this second adjustable resistance RF2.
The principle Analysis of the utility model adjustable gain audio power amplifying circuit preferred embodiments is following: this first input end Vinn and this second input Vinp import a pair of differential signal to this audio frequency amplifier PA through this first resistance R 11 and this second resistance R 12; This zero passage detection comparator C OM compares output signal and the common mode reference voltage V REF of this audio frequency amplifier PA, and output gain adjustment controls signal to this gain controller CTRL; This gain controller CTRL receives the gain-adjusted signal DB_IN of outside input; And detect when upset takes place the gain-adjusted control signal of zero passage detection comparator COM output; Gain-adjusted signal DB_IN is sent to this first adjustable resistance RF1 and this second adjustable resistance RF2, and this first adjustable resistance RF1 and this second adjustable resistance RF2 are according to the gain of the gain-adjusted signal DB_IN control audio power amplification circuit that receives.
When the gain-adjusted control signal that detects zero passage detection comparator C OM output as gain controller CTRL upset takes place for a long time, close zero passage detection comparator C OM automatically, thereby avoid gain-adjusted to lose efficacy.
See also Fig. 4 and Fig. 5; In another execution mode of the utility model adjustable gain audio power amplifying circuit; Can this comparing unit be connected between this input unit and this control unit, this comparing unit compares a pair of differential signal of this input unit input, and output gain adjustment controls signal to this control unit; When a pair of differential signal of input unit input equates, this gain-adjusted control signal will be overturn.Its operation principle is identical with the operation principle of the adjustable gain audio power amplifying circuit preferred embodiments shown in Fig. 2 and Fig. 3.In this another execution mode of adjustable gain audio power amplifying circuit, this input unit comprises a first input end Vinn ', one second input Vinp ', one first resistance R 11 ' and one second resistance R 12 '; This audio amplification unit is an audio frequency amplifier PA '; This gain adjustment unit comprises one first adjustable resistance RF1 ' and one second adjustable resistance RF2 '; This control unit is a gain controller CTRL '; This comparing unit is a zero passage detection comparator C OM '; This output unit is an output end vo ut '.
The circuit connecting relation of another execution mode of the utility model adjustable gain audio power amplifying circuit is following: this first input end Vinn ' links to each other with an end of this first resistance R 11 ' and the normal phase input end of this zero passage detection comparator C OM ', and the other end of this first resistance R 11 ' links to each other with the inverting input of this audio frequency amplifier PA ' and the end of this first adjustable resistance RF1 '.This second input Vinp ' links to each other with an end of this second resistance R 12 ' and the inverting input of this zero passage detection comparator C OM ', and the other end of this second resistance R 12 ' links to each other with the normal phase input end of this audio frequency amplifier PA ' and the end of this second adjustable resistance RF2 '.The other end of this first adjustable resistance RF1 ', the output of this audio frequency amplifier PA are connected with this output end vo ut ' jointly.The other end of this second adjustable resistance RF2 ' connects this common mode reference voltage V REF '.The output of this zero passage detection comparator C OM ' links to each other with the control end of this gain controller CTRL '; The input of this gain controller CTRL ' is used to receive the gain-adjusted signal DB_IN ' of input, and the output of this gain controller CTRL ' links to each other with the control end of this first adjustable resistance RF1 ' and the control end of this second adjustable resistance RF2 '.
The principle Analysis of another execution mode of the utility model adjustable gain audio power amplifying circuit is following: this first input end Vinn ' and this second input Vinp ' import a pair of differential signal to this audio frequency amplifier PA ' through this first resistance R 11 ' and this second resistance R 12 '; This zero passage detection comparator C OM ' compares this first input end Vinn ' with the differential signal of this second input Vinp ' input, and output gain adjustment controls signal to this gain controller CTRL '; This gain controller CTRL ' receives the gain-adjusted signal DB_IN ' of outside input; And detect when upset takes place the gain-adjusted control signal of zero passage detection comparator COM ' output; Gain-adjusted signal DB_IN ' is sent to this first adjustable resistance RF1 ' and this second adjustable resistance RF2 ', and this first adjustable resistance RF1 ' and this second adjustable resistance RF2 ' are according to the gain of gain-adjusted signal DB_IN ' the control audio power amplification circuit that receives.
When the gain-adjusted control signal that detects zero passage detection comparator C OM ' output as gain controller CTRL ' upset takes place for a long time, close zero passage detection comparator C OM ' automatically, thereby avoid gain-adjusted to lose efficacy.
See also Fig. 6; Fig. 6 exports the simulation waveform of signal when carrying out gain-adjusted for the utility model adjustable gain audio power amplifying circuit; From waveform, can find out; When the utility model adjustable gain audio power amplifying circuit was carried out gain-adjusted, saltus step did not take place in the output signal, therefore can not produce crack.
The utility model adjustable gain audio power amplifying circuit compares through output signal and the common mode reference voltage with audio power amplifying circuit; Or a pair of differential signal of audio power amplifying circuit input compared, export a gain-adjusted control signal and be used for indicating audio power amplifying circuit to carry out the moment of gain-adjusted.When upset takes place in the gain-adjusted control signal; The output signal that also is audio power amplifying circuit equates with the common mode reference voltage; Or a pair of differential signal of audio power amplifying circuit input carries out gain-adjusted when equating; Carry out the output signal generation saltus step that gain-adjusted can not make audio power amplifying circuit this moment, thereby can not produce crack.
The utility model adjustable gain audio power amplifying circuit is when carrying out gain-adjusted to audio power amplifying circuit, and the output signal of audio power amplifying circuit saltus step can not take place, and is simple in structure, and has effectively suppressed the crack that gain-adjusted produces.
Claims (10)
1. adjustable gain audio power amplifying circuit; It is characterized in that: said adjustable gain audio power amplifying circuit comprises that control unit, that gain adjustment unit, that audio amplification unit, that an input unit, links to each other with said input unit links to each other with said audio amplification unit links to each other with said gain adjustment unit is connected in the output unit that said gain adjustment unit and comparing unit and between the said control unit link to each other with said audio amplification unit; Said comparing unit compares the output signal and a common mode reference voltage of said output unit; And export a gain-adjusted and control signal to said control unit; Said gain-adjusted control signal is overturn when the output signal of said output unit equates with said common mode reference voltage; Said control unit detects when upset takes place said gain-adjusted control signal; A gain-adjusted signal that receives is sent to said gain adjustment unit, and said gain adjustment unit is according to the gain of the said adjustable gain audio power amplifying circuit of gain-adjusted signal controlling that receives.
2. adjustable gain audio power amplifying circuit as claimed in claim 1; It is characterized in that: said input unit comprises second resistance that first resistance and one that a first input end, one second input, link to each other with said first input end links to each other with said second input; Said audio amplification unit is an audio frequency amplifier; Said gain adjustment unit comprises one first adjustable resistance and one second adjustable resistance; Said control unit is a gain controller, and said comparing unit is a zero passage detection comparator, and said output unit is an output.
3. adjustable gain audio power amplifying circuit as claimed in claim 2; It is characterized in that: said first input end links to each other with an end of said first resistance; The other end of said first resistance links to each other with an inverting input of said audio frequency amplifier and an end of said first adjustable resistance; Said second input links to each other with an end of said second resistance, and the other end of said second resistance links to each other with a normal phase input end of said audio frequency amplifier and an end of said second adjustable resistance.
4. adjustable gain audio power amplifying circuit as claimed in claim 3; It is characterized in that: an output of the other end of said first adjustable resistance, said audio frequency amplifier, a normal phase input end of said zero passage detection comparator are connected with said output jointly; The other end of said second adjustable resistance links to each other with an inverting input of said zero passage detection comparator, and receives said common mode reference voltage jointly.
5. adjustable gain audio power amplifying circuit as claimed in claim 1; It is characterized in that: an output of said zero passage detection comparator links to each other with the control end of said gain controller; The input of said gain controller receives said gain-adjusted signal, and the output of said gain controller links to each other with the control end of said first adjustable resistance and the control end of said second adjustable resistance.
6. adjustable gain audio power amplifying circuit; It is characterized in that: said adjustable gain audio power amplifying circuit comprises that control unit, that gain adjustment unit, that audio amplification unit, that an input unit, links to each other with said input unit links to each other with said audio amplification unit links to each other with said gain adjustment unit is connected in the output unit that said input unit and comparing unit and between the said control unit link to each other with said audio amplification unit; Said comparing unit compares a pair of differential signal of said input unit input; And export a gain-adjusted and control signal to said control unit; Said gain-adjusted control signal is overturn when the differential signal of said input unit input equates; Said control unit detects when upset takes place said gain-adjusted control signal; A gain-adjusted signal that receives is sent to said gain adjustment unit, and said gain adjustment unit is according to the gain of the said adjustable gain audio power amplifying circuit of gain-adjusted signal controlling that receives.
7. adjustable gain audio power amplifying circuit as claimed in claim 6; It is characterized in that: said input unit comprises second resistance that first resistance and one that a first input end, one second input, link to each other with said first input end links to each other with said second input; Said audio amplification unit is an audio frequency amplifier; Said gain adjustment unit comprises one first adjustable resistance and one second adjustable resistance; Said control unit is a gain controller, and said comparing unit is a zero passage detection comparator, and said output unit is an output.
8. adjustable gain audio power amplifying circuit as claimed in claim 7; It is characterized in that: said first input end links to each other with an end of said first resistance and a normal phase input end of said zero passage detection comparator; The other end of said first resistance links to each other with an inverting input of said audio frequency amplifier and an end of said first adjustable resistance; Said second input links to each other with an end of said second resistance and an inverting input of said zero passage detection comparator, and the other end of said second resistance links to each other with a normal phase input end of said audio frequency amplifier and an end of said second adjustable resistance.
9. adjustable gain audio power amplifying circuit as claimed in claim 8; It is characterized in that: an output of the other end of said first adjustable resistance, said audio frequency amplifier is connected with said output jointly, and the other end of said second adjustable resistance connects a common mode reference voltage terminal.
10. adjustable gain audio power amplifying circuit as claimed in claim 9; It is characterized in that: an output of said zero passage detection comparator links to each other with the control end of said gain controller; The input of said gain controller receives said gain-adjusted signal, and the output of said gain controller links to each other with the control end of said first adjustable resistance and the control end of said second adjustable resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204221842U CN202334444U (en) | 2011-10-31 | 2011-10-31 | Adjustable-gain audio power amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204221842U CN202334444U (en) | 2011-10-31 | 2011-10-31 | Adjustable-gain audio power amplifying circuit |
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| CN202334444U true CN202334444U (en) | 2012-07-11 |
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| CN2011204221842U Withdrawn - After Issue CN202334444U (en) | 2011-10-31 | 2011-10-31 | Adjustable-gain audio power amplifying circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355214A (en) * | 2011-10-31 | 2012-02-15 | 四川和芯微电子股份有限公司 | Adjustable gain audio power amplification circuit |
| CN103761964A (en) * | 2014-01-16 | 2014-04-30 | 四川和芯微电子股份有限公司 | Automatic voice identification circuit |
| CN103905008A (en) * | 2012-12-27 | 2014-07-02 | 佳能株式会社 | Audio processing apparatus and method |
| CN109861649A (en) * | 2019-02-22 | 2019-06-07 | 上海艾为电子技术股份有限公司 | Signal processing circuit and audio power amplifying circuit |
-
2011
- 2011-10-31 CN CN2011204221842U patent/CN202334444U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355214A (en) * | 2011-10-31 | 2012-02-15 | 四川和芯微电子股份有限公司 | Adjustable gain audio power amplification circuit |
| CN102355214B (en) * | 2011-10-31 | 2014-01-15 | 四川和芯微电子股份有限公司 | Adjustable gain audio power amplification circuit |
| CN103905008A (en) * | 2012-12-27 | 2014-07-02 | 佳能株式会社 | Audio processing apparatus and method |
| US9319015B2 (en) | 2012-12-27 | 2016-04-19 | Canon Kabushiki Kaisha | Audio processing apparatus and method |
| CN103905008B (en) * | 2012-12-27 | 2017-03-01 | 佳能株式会社 | Audio processing equipment and audio-frequency processing method |
| CN103761964A (en) * | 2014-01-16 | 2014-04-30 | 四川和芯微电子股份有限公司 | Automatic voice identification circuit |
| CN103761964B (en) * | 2014-01-16 | 2016-04-13 | 四川和芯微电子股份有限公司 | Automatic speech recognition circuit |
| CN109861649A (en) * | 2019-02-22 | 2019-06-07 | 上海艾为电子技术股份有限公司 | Signal processing circuit and audio power amplifying circuit |
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Address after: 610041 Sichuan city of Chengdu province high tech Zone Kyrgyzstan Road 33 block A No. 9 Patentee after: IPGoal Microelectronics (Sichuan) Co., Ltd. Address before: 402 room 7, building 610041, incubator Park, hi tech Zone, Sichuan, Chengdu Patentee before: IPGoal Microelectronics (Sichuan) Co., Ltd. |
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Granted publication date: 20120711 Effective date of abandoning: 20140115 |
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| RGAV | Abandon patent right to avoid regrant |