CN101350593A - Circuit for suppressing POP noise - Google Patents
Circuit for suppressing POP noise Download PDFInfo
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- CN101350593A CN101350593A CNA2008100458936A CN200810045893A CN101350593A CN 101350593 A CN101350593 A CN 101350593A CN A2008100458936 A CNA2008100458936 A CN A2008100458936A CN 200810045893 A CN200810045893 A CN 200810045893A CN 101350593 A CN101350593 A CN 101350593A
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- noise reducing
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Abstract
The present invention discloses a POP noise suppression circuit, which is characterized by comprising an amplifier AMP, resistive components R1 and R2, and switches K1 and K2. The K1 and the R1 are arranged in the amplifier, and are arranged in the closed loop of working amplifier; the K2 and the R2 are connected in series between the output end of the amplifier and the ground. The POP noise suppression circuit realizes the boot-strap silence by changing the output resistance at the output end of the amplifier. Because the amplifier continuously works, the silencing effects are excellent. The circuit also has the following characteristics: the switch K1 is connected in series between the PMOS of the output end of the amplifier and the power supply; the channels are relatively fixed and have little influence on the performance of the amplifier; the K1 and the R1 are arranged in the amplifier and are located in the closed loop in the operating process, which further reduces the influence on the performance of the amplifier. Because the amplifier is arranged in the working state when the electricity is connected, the circuit prevents the noise caused by turning on the amplifier; the applied devices are resistors and MOSFET, which facilitates the integration.
Description
Technical field
The invention belongs to the audio frequency processing circuit technical field, specifically a kind of POP noise reducing circuit of portable audio output apparatus chip for driving.
Background technology
The POP noise refers in the message system ubiquitous because the noise that produces in power supply, outage or each music function handoff procedure.This noise mainly is because in above various conversion engineerings, the output signal common mode electrical level rapid saltus step takes place causes (as shown in Figure 1).
Wave form varies among Fig. 1 in the circle is the main cause of trigger noise, and the method that suppresses this noise mainly is mild by all means or reduces waveform transition on the PHIN.
At present, the scheme that suppresses the POP noise is a lot, but eliminating the POP noise fully but is still a difficult problem.Existing about the patent that suppresses the POP noise mostly at the chip exterior circuit, increased design cost undoubtedly, do not accepted by entire machine design person yet.
Yet for the integrated audio frequency output stage amplifier of CMOS (complementary metal oxide semiconductors (CMOS)), because various restrictions are (as choosing of components and parts, area, port etc.), integrated POP noise reducing circuit is subjected to some restrictions on effect, can produce some negative effects to the performance of output stage amplifier simultaneously, therefore less relatively at the POP noise treatment circuit of CMOS integrated circuit.
Summary of the invention
The invention provides a kind of POP noise reducing circuit, can eliminate the POP noise substantially.
Technical scheme of the present invention is as follows:
A kind of POP noise reducing circuit is characterized in that: include amplifier AMP, resistance element R1, R2, K switch 1, K2, described K1 and R1 are positioned at amplifier inside, and are positioned at the closed loop of amplifier user mode, and described K2 and R2 are serially connected with between amplifier output stage and the ground.
Described resistance element R1 is serially connected with between amplifier output stage and the power supply.
Described K1, K2 and AMP are controlled by the control signal 01,03,02 of logic control circuit output respectively.Described logic control circuit can be logic control circuit commonly used, also can require design according to user oneself.
The operation principle of described POP noise reducing circuit is as follows:
During energising, the control signal 01 of K switch 1 is in disarmed state, and the control signal 03 of K switch 2 is in effective status, the control signal 02 of amplifier is in disarmed state, and promptly K1 disconnects, and K2 connects, amplifier is not worked, and this moment, output node 04 was moved to low level/ground by R2; K2 disconnects then, and amplifier is started working, because this moment, amplifier output impedance was bigger, node 04 slowly is charged to VREF, thereby has realized the inhibition to the POP noise; K1 connects after entering normal operating conditions, and the output impedance of step-down amplifier is to guarantee the output performance of amplifier; During outage, K1 disconnects, and amplifier cuts out, and K2 connects, and node 04 is slowly discharged into low level.
Described output node 04 is between the connecting circuit of amplifier output stage and K2, R2.
Described K switch 1 realizes that by PMOS pipe (P-channel field-effect transistor (PEFT) pipe) MP1 described MP1 is serially connected with between the PMOS and power supply of amplifier output stage.
Described K switch 2 is realized by NMOS pipe (N channel field-effect pipe) MN1.
The K switch 1 of described logic control circuit, the control signal 01 of K2 through a reverser after picked up signal 05, signal 03 through a reverser after picked up signal 06; Be connected with capacitive device MP5 between signal 05 and the power supply, be connected with capacitive device MP6 between signal 06 and the power supply.
Beneficial effect of the present invention:
The present invention realizes turn-on muting by the output impedance that changes output stage amplifier, and is because amplifier is in continuous duty, quiet effective; Also have in addition: K switch 1 is serially connected with between the PMOS and power supply of amplifier output stage, and the road leads to relative fixed, and the pair amplifier performance impact is little; K1, R1 are in amplifier inside, in use are in the closed loop, have further reduced the pair amplifier Effect on Performance; Amplifier is in running order in power up, has avoided opening the caused noise of amplifier; Used device is resistance and MOSFET, is convenient to integrated.
Description of drawings
Fig. 1 is the signal output schematic diagram of background technology of the present invention
Fig. 2 is a structure principle chart of the present invention
Fig. 3 is an application structure schematic diagram of the present invention
Fig. 4 is an application structure schematic diagram of the present invention
Fig. 5 is a waveform effect schematic diagram of the present invention
Embodiment
Embodiment 1
Shown in Fig. 2-3, a kind of POP noise reducing circuit includes amplifier AMP, resistance element R1, R2, K switch 1, K2, described K1 and R1 are positioned at amplifier inside, and be positioned at the closed loop of amplifier user mode, described K2 and R2 are serially connected with between amplifier output and the ground.
Described resistance element R1 is serially connected with between the PMOS and power supply of amplifier output stage.
Described K1, K2 and AMP are controlled by the control signal 01,03,02 of logic control circuit output respectively.Described logic control circuit can be logic control circuit commonly used, also can require design according to user oneself.
The operation principle of described POP noise reducing circuit is as follows:
During energising, the control signal 01 of K switch 1 is in disarmed state, and the control signal 03 of K switch 2 is in effective status, the control signal 02 of amplifier is in disarmed state, and promptly K1 disconnects, and K2 connects, amplifier is not worked, and this moment, output node 04 was moved to low level/ground by R2; K2 disconnects then, and amplifier is started working, because this moment, amplifier output impedance was bigger, node 04 slowly is charged to VREF, thereby has realized the inhibition to the POP noise; K1 connects after entering normal operating conditions, and the output impedance of step-down amplifier is to guarantee the output performance of amplifier; During outage, K1 disconnects, and amplifier cuts out, and K2 connects, and node 04 is slowly discharged into low level.Amplifier is in running order in whole power up.
Described output node 04 is between the connecting circuit of amplifier output stage and K2, R2.
Described K switch 1 realizes that by PMOS pipe (P-channel field-effect transistor (PEFT) pipe) MP1 described MP1 is serially connected with between the PMOS and power supply of amplifier output stage.
Described K switch 2 is realized by NMOS pipe (N channel field-effect pipe) MN1.
As shown in Figure 4, the K switch 1 of described logic control circuit, the control signal 01 of K2 through a reverser after picked up signal 05, signal 03 through a reverser after picked up signal 06; Be connected with capacitive device MP5 between signal 05 and the power supply, be connected with capacitive device MP6 between signal 06 and the power supply.
As shown in Figure 5, be the power on waveform of each node of physical circuit adopting this scheme and system.
This circuit is that the size by control amplifier output impedance realizes the inhibition to the POP noise.
K switch 1 is serially connected with between the PMOS and power supply of amplifier output stage, and this position is all more fixing for MP1 G, D, S, B voltage, thus the MP1 road logical after, the road leads to relative fixed, the pair amplifier performance impact is little; K1, R1 are in amplifier inside, in use are in the closed loop, have further reduced the pair amplifier Effect on Performance; Control signal is provided by structure shown in Figure 4, guarantees still can realize when the preliminary examination phase logic control circuit that powers on can't provide correct signal control; Amplifier is in running order in power up, has avoided opening the caused noise of amplifier; Used device is resistance and MOSFET, is convenient to integrated.
Embodiment 2
This programme is applied to the audio output apparatus chip for driving, mainly is at driving 16 ohm, the audio frequency pio chip of 8 ohm of loudspeaker on 32 ohm of earphones and the portable equipment.As digital/analog signal transducer output in the codec chip.
Claims (8)
1, a kind of POP noise reducing circuit is characterized in that: include amplifier AMP, resistance element R1, R2, K switch 1, K2, described K1 and R1 are positioned at amplifier inside, and are positioned at the closed loop of amplifier user mode, and described K2 and R2 are serially connected with between amplifier output stage and the ground.
2, according to the described a kind of POP noise reducing circuit of claim 1, it is characterized in that: described resistance element R1 is serially connected with between amplifier output stage and the power supply.
3, according to the described a kind of POP noise reducing circuit of claim 1, it is characterized in that: described K1, K2 and AMP are controlled by the control signal 01,03,02 of logic control circuit output respectively.
4, according to the described a kind of POP noise reducing circuit of claim 1, the operation principle that it is characterized in that the POP noise reducing circuit is as follows: during energising, the control signal 01 of K switch 1 is in disarmed state, the control signal 03 of K switch 2 is in effective status, the control signal 02 of amplifier is in disarmed state, and promptly K1 disconnects, and K2 connects, amplifier is not worked, and this moment, output node 04 was moved to low level/ground by R2; K2 disconnects then, and amplifier is started working, because this moment, amplifier output impedance was bigger, node 04 slowly is charged to VREF, thereby has realized the inhibition to the POP noise; K1 connects after entering normal operating conditions, and the output impedance of step-down amplifier is to guarantee the output performance of amplifier; During outage, K1 disconnects, and amplifier cuts out, and K2 connects, and node 04 is slowly discharged into low level.
5, according to the described a kind of POP noise reducing circuit of claim 4, it is characterized in that: described output node 04 is between the connecting circuit of amplifier output stage and K2, R2.
6, according to claim 1 or 4 described a kind of POP noise reducing circuits, it is characterized in that: described K switch 1 realizes that by PMOS pipe MP1 described MP1 is serially connected with between the PMOS and power supply of amplifier output stage.
7, according to claim 1 or 4 described a kind of POP noise reducing circuits, it is characterized in that: described K switch 2 is realized by NMOS pipe MN1.
8, according to claim 1 or 3 or 4 described a kind of POP noise reducing circuits, it is characterized in that: the K switch 1 of described logic control circuit, the control signal 01 of K2 through a reverser after picked up signal 05, signal 03 through a reverser after picked up signal 06; Be connected with capacitive device MP5 between signal 05 and the power supply, be connected with capacitive device MP6 between signal 06 and the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100458936A CN101350593B (en) | 2008-08-26 | 2008-08-26 | Circuit for suppressing POP noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100458936A CN101350593B (en) | 2008-08-26 | 2008-08-26 | Circuit for suppressing POP noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350593A true CN101350593A (en) | 2009-01-21 |
| CN101350593B CN101350593B (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100458936A Expired - Fee Related CN101350593B (en) | 2008-08-26 | 2008-08-26 | Circuit for suppressing POP noise |
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| Country | Link |
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| CN (1) | CN101350593B (en) |
Cited By (10)
| 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 |
| CN101835071A (en) * | 2010-03-31 | 2010-09-15 | 惠州市德赛西威汽车电子有限公司 | Sound noise control circuit |
| CN101986668A (en) * | 2010-09-03 | 2011-03-16 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP tone in dual-mode handset earphone communication |
| CN102547528A (en) * | 2012-01-04 | 2012-07-04 | 深圳市宽宏科技有限公司 | Booting moment mute circuit |
| 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 |
| CN102572642A (en) * | 2010-12-14 | 2012-07-11 | 联芯科技有限公司 | Audio POP sound elimination method and earphone audio circuit |
| CN103248985A (en) * | 2012-02-03 | 2013-08-14 | 安凯(广州)微电子技术有限公司 | Noise-suppression circuit provided with blocking capacitor of audio amplifier |
| CN103402157A (en) * | 2013-08-02 | 2013-11-20 | 北京昆腾微电子有限公司 | Audio-frequency circuit and method for eliminating POP noises |
| CN107370466A (en) * | 2011-09-16 | 2017-11-21 | 意法半导体研发(深圳)有限公司 | Amplifying circuit |
| CN108810735A (en) * | 2017-04-28 | 2018-11-13 | 华为技术有限公司 | A kind of suppressing method, audio output circuit and the terminal of POP sounds |
-
2008
- 2008-08-26 CN CN2008100458936A patent/CN101350593B/en not_active Expired - Fee Related
Cited By (17)
| 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 |
| CN101835071A (en) * | 2010-03-31 | 2010-09-15 | 惠州市德赛西威汽车电子有限公司 | Sound noise control circuit |
| CN101835071B (en) * | 2010-03-31 | 2013-07-03 | 惠州市德赛西威汽车电子有限公司 | Sound noise control circuit |
| CN101986668A (en) * | 2010-09-03 | 2011-03-16 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP tone in dual-mode handset earphone communication |
| CN101986668B (en) * | 2010-09-03 | 2014-11-26 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP tone in dual-mode handset earphone communication |
| 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 |
| CN102572642A (en) * | 2010-12-14 | 2012-07-11 | 联芯科技有限公司 | Audio POP sound elimination method and earphone audio circuit |
| CN102572642B (en) * | 2010-12-14 | 2014-12-10 | 联芯科技有限公司 | Audio POP sound elimination method and earphone audio circuit |
| CN107370466A (en) * | 2011-09-16 | 2017-11-21 | 意法半导体研发(深圳)有限公司 | Amplifying circuit |
| CN102547528A (en) * | 2012-01-04 | 2012-07-04 | 深圳市宽宏科技有限公司 | Booting moment mute circuit |
| CN103248985A (en) * | 2012-02-03 | 2013-08-14 | 安凯(广州)微电子技术有限公司 | Noise-suppression circuit provided with blocking capacitor of audio amplifier |
| CN103248985B (en) * | 2012-02-03 | 2015-12-09 | 安凯(广州)微电子技术有限公司 | A kind of audio frequency power amplifier squelch-circuit with the straight electric capacity of isolation |
| CN103402157A (en) * | 2013-08-02 | 2013-11-20 | 北京昆腾微电子有限公司 | Audio-frequency circuit and method for eliminating POP noises |
| CN103402157B (en) * | 2013-08-02 | 2016-09-28 | 昆腾微电子股份有限公司 | Voicefrequency circuit, audio system and the method eliminating POP noise |
| CN108810735A (en) * | 2017-04-28 | 2018-11-13 | 华为技术有限公司 | A kind of suppressing method, audio output circuit and the terminal of POP sounds |
| CN108810735B (en) * | 2017-04-28 | 2020-03-20 | 华为技术有限公司 | POP sound suppression method, audio output circuit and terminal |
| US10893360B2 (en) | 2017-04-28 | 2021-01-12 | Huawei Technologies Co., Ltd. | Pop sound suppression method, audio output circuit, and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101350593B (en) | 2010-12-08 |
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Owner name: SHANGHAI WANDEKAI INDUSTRIAL CO., LTD. Free format text: FORMER OWNER: IPGOAL MICROELECTRONICS (SICHUAN) CO., LTD. Effective date: 20120718 |
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Free format text: CORRECT: ADDRESS; FROM: 610041 CHENGDU, SICHUAN PROVINCE TO: 201699 SONGJIANG, SHANGHAI |
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Effective date of registration: 20120718 Address after: 201699, 1-10, Lane 2100, loose steam Road, Lake Rock Town, Shanghai, Shanghai, Songjiang District Patentee after: Shenzhen WDK Technology Co., Ltd. Address before: 409 room 7, building 610041, incubator Park, hi tech Zone, Sichuan, Chengdu Patentee before: IPGoal Microelectronics (Sichuan) Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20200826 |
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| CF01 | Termination of patent right due to non-payment of annual fee |