WO2023160202A1 - Circuit de protection de sortie de microphone de capteur, et microphone de capteur - Google Patents

Circuit de protection de sortie de microphone de capteur, et microphone de capteur Download PDF

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Publication number
WO2023160202A1
WO2023160202A1 PCT/CN2022/141623 CN2022141623W WO2023160202A1 WO 2023160202 A1 WO2023160202 A1 WO 2023160202A1 CN 2022141623 W CN2022141623 W CN 2022141623W WO 2023160202 A1 WO2023160202 A1 WO 2023160202A1
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WIPO (PCT)
Prior art keywords
output
terminal
module
switching tube
voltage
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PCT/CN2022/141623
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English (en)
Chinese (zh)
Inventor
陈章益
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歌尔微电子股份有限公司
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Publication of WO2023160202A1 publication Critical patent/WO2023160202A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage

Definitions

  • the present application relates to the technical field of microphones, in particular to a sensor microphone output protection circuit and a sensor microphone.
  • sensor microphones MEMS–Micro Electro Mechanical System
  • the main purpose of this application is to provide a sensor microphone output protection circuit and a sensor microphone, aiming at eliminating the abnormal audio signal output by the sensor microphone when the voltage of the sensor microphone is insufficient or the battery is attenuated and dead.
  • the present application proposes a sensor microphone output protection circuit, which is applied to a sensor microphone.
  • the sensor microphone includes an amplified output circuit, a power supply terminal and an audio output terminal, and the amplified output circuit is connected to the power supply terminal and the audio output terminal respectively.
  • the audio output terminal is electrically connected, and the sensor microphone output protection circuit includes:
  • a voltage detection module the detection terminal of the voltage detection module is connected to the power supply terminal;
  • a low-power trigger module the output terminal of the voltage detection module is electrically connected to the controlled terminal of the low-power trigger module
  • a switch module the controlled end of the switch module is electrically connected to the low-power trigger module, and the switch module is used to control the output of the amplified output circuit or stop the output;
  • the voltage detection module is used to detect the power supply voltage connected to the power supply terminal, and output a corresponding voltage detection signal
  • the low-power trigger module is configured to output a shutdown signal to control the action of the switch module when the voltage of the voltage detection signal is lower than a preset low-power voltage, so that the amplifying output circuit stops outputting.
  • the voltage detection module includes: a first resistor and a second resistor, the first end of the first resistor is connected to the power supply end, the second end of the first resistor is connected to the first resistor The two resistors are connected, and the second end of the second resistor is grounded.
  • the low-power trigger module includes: a third resistor, a first switch tube, a first inverter and a second inverter, the first end of the third resistor is connected to the power supply end , the second end of the third resistor and the input end of the first switch tube are respectively connected to the input end of the second inverter, and the output end of the second inverter is connected to the first inverter
  • the input end of the phase controller is connected, the controlled end of the first switch tube is connected to the second end of the first resistor, and the output end of the first switch tube is grounded.
  • the amplified output circuit includes a BIAS module, a second switch tube, and a third switch tube
  • the BIAS module is connected to the controlled terminal of the second switch tube and the controlled terminal of the third switch tube respectively.
  • the control terminal is connected, the input terminal of the second switching tube is connected to the power supply terminal, the output terminal of the third switching tube is grounded, the output terminal of the second switching tube, the input terminal of the third switching tube respectively connected to the audio output terminals
  • the switch module includes: a fourth switch tube and a fifth switch tube;
  • the input end of the fourth switching tube is electrically connected to the BIAS module, the output end of the fourth switching tube is connected to the controlled end of the second switching tube, and the controlled end of the fourth switching tube connected to the output end of the first inverter;
  • the input end of the fifth switching tube is electrically connected to the BIAS module, and the output end of the fifth switching tube is connected to the controlled end of the third switching tube , the controlled end of the fifth switching transistor is connected to the input end of the first inverter.
  • the switch module further includes: a sixth switch tube and a seventh switch tube;
  • the input terminal of the sixth switching tube is connected to the power supply terminal, the output terminal of the sixth switching tube is connected to the controlled terminal of the second switching tube, and the controlled terminal of the sixth switching tube is connected to the controlled terminal of the sixth switching tube.
  • the input end of the first inverter is connected;
  • the input terminal of the seventh switching tube is connected to the controlled terminal of the third switching tube, the output terminal of the seventh switching tube is grounded, and the controlled terminal of the seventh switching tube is opposite to the first connected to the output of the device.
  • the sensor microphone output protection circuit further includes:
  • a signal enhancement module is respectively connected to the controlled end of the low power trigger module and the switch module;
  • the signal enhancement module is configured to enhance the signal strength of the shutdown signal and output it.
  • the sensor microphone output protection circuit further includes:
  • a voltage pull-down module, the voltage pull-down module is electrically connected to the voltage detection module and the low-power trigger module respectively;
  • the voltage pull-down module is configured to pull down the voltage of the voltage detection signal when receiving the shutdown signal.
  • the sensor microphone output protection circuit further includes:
  • a signal enhancement module is respectively connected to the controlled end of the low power trigger module and the switch module;
  • the signal enhancement module is configured to enhance the signal strength of the shutdown signal and output it;
  • the signal enhancement module includes a third inverter and a fourth inverter, the input end of the fourth inverter is connected to the input end of the first switching tube, and the input end of the third inverter The input terminal is connected to the output terminal of the fourth inverter, and the output terminal of the third inverter is connected to the input terminal of the second inverter.
  • the sensor microphone output protection circuit further includes:
  • a voltage pull-down module, the voltage pull-down module is electrically connected to the voltage detection module and the low-power trigger module respectively;
  • the voltage pull-down module is configured to pull down the voltage of the voltage detection signal when receiving the shutdown signal
  • the voltage pull-down module includes a fourth resistor and an eighth switch tube, the first terminal of the fourth resistor and the input terminal of the eighth switch tube are respectively connected to the power supply terminal, and the fourth resistor The second terminal of the eighth switching tube and the output terminal of the eighth switching tube are respectively connected to the first terminal of the first resistor, and the controlled terminal of the eighth switching tube is connected to the output terminal of the third inverter.
  • the present application also proposes a sensor microphone, the sensor microphone includes an amplified output circuit, a power supply terminal, an audio output terminal, and the sensor microphone output protection circuit as described in any one of the above, and the sensor microphone output protection circuit is respectively connected to the The power supply terminal and the amplified output circuit are electrically connected.
  • the application includes a voltage detection module, a low power trigger module and a switch module.
  • the switch module is used to control the output of the amplified output circuit or to stop the output
  • the voltage detection module is used to detect the power supply voltage connected to the power supply terminal, and output the corresponding voltage detection signal
  • the low-power trigger module is configured to operate when the voltage of the voltage detection signal When the voltage is lower than the preset low voltage, the output shutdown signal controls the action of the switch module, so that the amplifying output circuit stops outputting.
  • the amplifying output circuit can be controlled in time to stop the output, so that the audio output terminal becomes a high-impedance state, so that the sensor microphone is muted
  • the state thereby eliminates the abnormal audio signal output by the sensor microphone so that the user does not hear unpleasant sounds.
  • controlling the output of the amplified output circuit to stop output when the power is low can also ensure that no leakage current occurs in the amplified output circuit, effectively ensuring the stability and reliability of the amplified output circuit.
  • Fig. 1 is a module schematic diagram of an embodiment of the sensor microphone output protection circuit of the present application
  • Fig. 2 is a module schematic diagram of an embodiment of the sensor microphone output protection circuit of the present application
  • Fig. 3 is a module schematic diagram of an embodiment of the sensor microphone output protection circuit of the present application.
  • FIG. 4 is a specific circuit schematic diagram of an embodiment of the sensor microphone output protection circuit of the present application.
  • FIG. 5 is a specific circuit diagram of an embodiment of the sensor microphone output protection circuit of the present application.
  • FIG. 6 is a specific circuit schematic diagram of an embodiment of a sensor microphone output protection circuit of the present application.
  • label name label name 10 voltage detection module 20 Low power trigger module 30 switch module 40 Signal Enhancement Module 50 Voltage pull down module the the
  • sensor microphones MEMS–Micro Electro Mechanical System
  • the voltage of the traditional sensor microphone is insufficient when it is powered on or the battery is attenuated and dead, multiple internal modules will fail, resulting in abnormal output audio signals, causing users to hear unpleasant sounds.
  • the present application proposes a sensor microphone output protection circuit, which is applied to a sensor microphone.
  • the sensor microphone includes an amplifying output circuit, a power supply terminal and an audio output terminal, and the amplifying output circuit is electrically connected to the power supply terminal and the audio output terminal respectively.
  • the sensor microphone output protection circuit includes:
  • a voltage detection module 10 the detection terminal of the voltage detection module 10 is connected to the power supply terminal;
  • a low-power trigger module 20 the output terminal of the voltage detection module 10 is electrically connected to the controlled end of the low-power trigger module 20;
  • a switch module 30, the controlled end of the switch module 30 is electrically connected to the low-power trigger module 20, and the switch module 30 is used to control the output of the amplified output circuit or stop the output;
  • a voltage detection module 10 configured to detect the power supply voltage connected to the power supply terminal, and output a corresponding voltage detection signal
  • the low-power trigger module 20 is configured to output a shutdown signal to control the action of the switch module 30 when the voltage of the voltage detection signal is lower than the preset low-power voltage, so that the amplified output circuit stops outputting.
  • the voltage detection module 10 can be implemented using a resistor divider circuit
  • the low-power trigger module 20 can use a main controller, such as MCU, DSP (Digital Signal Process, digital signal processing chip), FPGA (Field Programmable Gate Array, programmable logic gate array chip), etc.
  • the main controller can be provided with an ADC detection module, a calculation module and a processing module. In this way, the main controller can determine the voltage value of the power supply voltage connected to the current power supply terminal by detecting the voltage value divided by the resistor voltage divider circuit and the resistance ratio in the resistor voltage divider circuit.
  • Switch module 30 can adopt switch tube such as MOS tube, triode and IGBT tube etc., also can adopt relay, switch module 30 can be arranged in the content of amplifying output circuit, for example referring to Fig. 4, switch module 30 is arranged in BIAS module and the second switch tube and the push-pull circuit composed of the third switch tube, so that when the main controller determines that the voltage of the voltage detection signal is lower than the preset low voltage, it can confirm that the current power supply voltage is in an abnormal state, and then output a shutdown signal to control the switch The module 30 is in a disconnected state, so as to control the output of the amplified output circuit so that the audio output terminal is in a high-impedance state.
  • switch tube such as MOS tube, triode and IGBT tube etc.
  • relay switch module 30 can be arranged in the content of amplifying output circuit, for example referring to Fig. 4, switch module 30 is arranged in BIAS module and the second switch tube and the push-pull circuit composed of the third switch tube, so
  • the preset low voltage can be set by the research and development personnel according to the resistance value ratio in the resistor voltage divider circuit and the voltage value when the power supply voltage is in an abnormal state.
  • the main controller determines that the voltage of the voltage detection signal is higher than the preset low voltage, it can confirm that the current power supply voltage is in a normal state, and then outputs a closed signal to control the switch module 30 to be in a closed state, thereby controlling the amplified output circuit to be normal.
  • the audio signal is output through the audio output terminal.
  • the voltage detection module 10 includes: a first resistor R1 and a second resistor R2, the first end of the first resistor R1 is connected to the power supply terminal VDD, the second end of the first resistor R1 is connected to the second The two resistors R2 are connected, and the second end of the second resistor R2 is grounded.
  • the low-power trigger module 20 includes: a third resistor R3, a first switch tube Q1, a first inverter F1 and a second inverter F2, the first end of the third resistor R3 is connected to the power supply terminal VDD, and the third resistor R3
  • the second terminal of the first switching tube Q1 and the input terminal of the first switch tube Q1 are respectively connected to the input terminal of the second inverter F2, the output terminal of the second inverter F2 is connected to the input terminal of the first inverter F1, and the first switch
  • the controlled end of the transistor Q1 is connected to the second end of the first resistor, and the output end of the first switching transistor Q1 is grounded.
  • the amplified output circuit includes a BIAS module, a second switch tube Q2 and a third switch tube Q3, the BIAS module is respectively connected to the controlled end of the second switch tube Q2 and the controlled end of the third switch tube Q3, and the second switch tube Q2
  • the input terminal is connected to the power supply terminal VDD
  • the output terminal of the third switching tube Q3 is grounded
  • the output terminal of the second switching tube Q2 and the input terminal of the third switching tube Q3 are connected to the audio output terminal respectively
  • the switch module 30 includes: a fourth switch Tube Q4 and the fifth switch tube Q5;
  • the input terminal of the fourth switching tube Q4 is electrically connected to the BIAS module, the output terminal of the fourth switching tube Q4 is connected to the controlled terminal of the second switching tube Q2, and the controlled terminal of the fourth switching tube Q4 is connected to the first inverter
  • the output terminal of F1 is connected;
  • the input terminal of the fifth switching tube Q5 is electrically connected to the BIAS module, the output terminal of the fifth switching tube Q5 is connected to the controlled terminal of the third switching tube Q3, and the controlled terminal of the fifth switching tube Q5 is connected to the controlled terminal of the fifth switching tube Q5.
  • An input terminal of an inverter F1 is connected.
  • the first switching tube Q1, the third switching tube Q3, and the fifth switching tube Q5 are NMOS tubes
  • the second switching tube Q2 and the fourth switching tube Q4 are PMOS tubes
  • the preset low voltage is the voltage of the first switching tube Q1.
  • Turn-on voltage The resistance values of the first resistor R1 and the second resistor R2 can be set by the developer by the turn-on voltage of the first switch tube Q1, so that when the power supply voltage is in an abnormal state, the voltage value of the voltage detection signal cannot reach the first A turn-on voltage of the switch tube Q1.
  • the normal power supply voltage of VDD is 3V
  • the turn-on voltage is 0.7V
  • the resistance values of the first resistor R1 and the second resistor R2 are 100K ⁇ as an example for illustration.
  • the output voltage is a voltage detection signal of 1.5V, which can turn on the first switch tube Q1, so that the third resistor R3
  • the second end is directly grounded, at this time the level of the second end of the third resistor R3 is low level, after passing through the first inverter F1, it is converted into a high level signal and output to the fifth switch tube through the second output terminal VL
  • the controlled terminal of Q5 so that the fifth switching tube Q5 is in the conduction state.
  • a low-level signal is also output to the controlled end of the fourth switching transistor Q4 through the first output terminal VLB, so that the fourth switching transistor Q4 is turned on.
  • the closing signal is a low-level signal output through the first output terminal VLB and a high-level signal output through the second output terminal VL.
  • the first resistor R1 and the second resistor R2 divide the voltage to output a voltage detection signal with a voltage of 0.6V, so that the first switch tube Q1 is turned off.
  • the voltage at the second terminal of the third resistor R3 is pulled up to the voltage value of the power supply voltage, which is 1.2V, and a low-level signal (0V) is output through the second output terminal VL after passing through the first inverter F1.
  • a high-level signal (1.2V) is output through the first output terminal VLB.
  • both the fourth switching tube Q4 and the fifth switching tube Q5 are in the off state, so that the BIAS module cannot control the first
  • the second switching tube Q2 and the third switching tube Q3 stop the output of the amplifying output circuit, so that the audio output terminal is in a high-impedance state.
  • the shutdown signal is a low-level signal output through the first output terminal VL and a high-level signal output through the second output terminal VLB.
  • the switch module 30 may further include a sixth switch transistor Q6 and a seventh switch transistor Q7;
  • the input terminal of the sixth switching tube Q6 is connected to the power supply terminal VDD, the output terminal of the sixth switching tube Q6 is connected to the controlled terminal of the second switching tube Q2, and the controlled terminal of the sixth switching tube Q6 is connected to the first inverter F1 The input terminal connection;
  • the input terminal of the seventh switching tube Q7 is connected to the controlled terminal of the third switching tube Q3, the output terminal of the seventh switching tube Q7 is grounded, and the controlled terminal of the seventh switching tube Q7 is connected to the output terminal of the first inverter.
  • the high-level signal output by the first output terminal VLB and the low-level signal output by the second output terminal VL will make the sixth switching tube Q6 and the seventh switching tube Q7 in the conduction state. , so as to pull up the voltage of the controlled terminal of the second switching tube Q2 to the supply voltage (that is, a high-level voltage), and pull down the voltage of the controlled terminal of the third switching tube Q3 to ground (that is, a low-level voltage), so as to It is ensured that the second switching tube Q2 and the third switching tube Q3 can be completely controlled to be in the off state.
  • the signal output by the first output terminal VLB cannot be normally output to the receiver of the fourth switching tube Q4. console.
  • the present application includes a voltage detection module 10 , a low power trigger module 20 and a switch module 30 .
  • the switch module 30 is used to control the output of the amplified output circuit or to stop the output
  • the voltage detection module 10 is used to detect the power supply voltage connected to the power supply terminal, and output a corresponding voltage detection signal
  • the low power trigger module 20 is configured to When the voltage of the signal is lower than the preset low voltage, the output shutdown signal controls the action of the switch module 30, so that the amplifying output circuit stops outputting.
  • the amplifying output circuit can be controlled in time to stop the output, so that the audio output terminal becomes a high-impedance state, so that the sensor microphone is muted
  • the state thereby eliminates the abnormal audio signal output by the sensor microphone so that the user does not hear unpleasant sounds.
  • controlling the output of the amplified output circuit to stop output when the power is low can also ensure that no leakage current occurs in the amplified output circuit, effectively ensuring the stability and reliability of the amplified output circuit.
  • the sensor microphone output protection circuit further includes:
  • a signal enhancement module 40, the signal enhancement module 40 is connected to the controlled end of the low power trigger module 20 and the switch module 30 respectively;
  • the signal enhancement module 40 is configured to enhance the signal strength of the shutdown signal and then output it.
  • the signal enhancement module 40 can be implemented by using an amplifier, a buffer, etc., and the signal enhancement module 40 can provide a shaping function for the signal, so as to enhance the signal strength of the shutdown signal and then output it to the switch module 30, so that During the transmission of the shutdown signal, the signal will not be degraded due to the parasitic capacitance on the wiring.
  • the signal strength of the shut-off signal can be effectively increased, thereby improving the working stability and reliability of the sensor microphone output protection circuit of the present application.
  • the signal enhancement module 40 includes a third inverter F3 and a fourth inverter F4, the input terminal of the fourth inverter F3 is connected to the input terminal of the first switching transistor Q1
  • the input terminal of the third inverter F3 is connected to the output terminal of the fourth inverter F4, and the output terminal of the third inverter F3 is connected to the input terminal of the second inverter F2.
  • the first inverter F1 and the second inverter F2 form a set of buffers
  • the third inverter F3 and the fourth inverter F4 form another set of buffers
  • the first switching tube Q1 when the voltage of the voltage detection signal is higher than the preset low voltage, the first switching tube Q1 can be turned on, and the output is a low-level signal shutdown signal, which passes through the fourth inverter F4 After the signal is enhanced with the third inverter F3, it is converted into an enhanced high-level signal through the second inverter F2, and then passes through the second output terminal VL to the controlled terminal of the fifth switching tube Q5 and the seventh switch The controlled end of the tube Q7, and converted into an enhanced low-level signal by the first inverter F1, and then passed through the first output terminal VLB to the controlled end of the fourth switching tube Q4 and the controlled terminal of the sixth switching tube Q6 terminal to disconnect the connection path between the BIAS module in the amplifying output circuit and the controlled terminal of the second switch tube Q2 and the controlled terminal of the third switch tube Q3, so that the audio output terminal is in a high-impedance state.
  • the sensor microphone output protection circuit further includes:
  • the voltage pull-down module 50 is electrically connected to the voltage detection module 10 and the low-power trigger module 20 respectively;
  • the voltage pull-down module 50 is configured to pull down the voltage of the voltage detection signal when receiving the shutdown signal.
  • the voltage pull-down module 50 includes a fourth resistor R4 and an eighth switch tube Q8, the first end of the fourth resistor R4 and the input end of the eighth switch tube Q8 are respectively connected to the power supply terminal VDD , the second terminal of the fourth resistor R4 and the output terminal of the eighth switching tube Q8 are respectively connected to the first terminal of the first resistor R1, and the controlled terminal of the eighth switching tube Q8 is connected to the output terminal of the third inverter F3 .
  • the eighth switch tube Q8 is a PMOS tube
  • the first switch tube Q1 is an NMOS tube
  • the normal voltage of VDD is 3V
  • the low voltage is 1.2V
  • the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 Both are 100K as an example for illustration;
  • the first resistor R1 and the second resistor R2 When the voltage of VDD is normal, the first resistor R1 and the second resistor R2 will divide the voltage of VDD to output a voltage detection signal with a voltage of 1.5V, so as to control Q1 to be in the conduction state, so that the first resistor of the third resistor R3 The level of the two terminals is low level. After passing through a group of buffers, a low level signal will be output to the controlled end of the eighth switching tube Q8, so that the eighth switching tube Q8 is in the conduction state.
  • the The four resistors R4 will be short-circuited by the eighth switch tube Q8 which is in the conduction state, otherwise it will affect the conduction state of the first switch tube Q1, that is, it will not affect the normal operation of the amplifying output circuit.
  • the voltage of VDD When the voltage of VDD is abnormal, for example, it is a low voltage of 1.2V. At this time, due to the low voltage, the first switch tube Q1 will be in a closed state. At this time, the voltage of the second terminal of the third resistor R3 is 1.2V. After a set of After the buffer, the eighth switch tube Q8 will be controlled to be in the off state. At this time, the fourth resistor R4 will divide the voltage with the first resistor R1 and the second resistor R2, and further lower the voltage of the second terminal of the first resistor R1.
  • the voltage of the controlled terminal of the first switching tube Q1 will be pulled down to 0.3V, so as to fully ensure that the first switching tube Q1 is completely turned off.
  • the first switch tube Q1 cannot be turned on, so as to prevent the abnormal voltage from being divided by the first resistor R1 and the second resistor R2.
  • the fact that the switch tube Q1 is in the conduction state effectively improves the reliability and stability of the sensor microphone output protection circuit of the present application.
  • the present application also proposes a sensor microphone.
  • the sensor microphone includes an amplified output circuit, a power supply terminal, an audio output terminal and a sensor microphone output protection circuit as described above.
  • the sensor microphone output protection circuit is connected to the power supply terminal and the amplified output circuit respectively. connect.
  • the amplifying output circuit includes a BIAS module, a second switch tube and a third switch tube
  • the BIAS module is respectively connected to the controlled end of the second switch tube and the controlled end of the third switch tube
  • the input terminal of the second switch tube is connected to the controlled end of the third switch tube.
  • the power supply end is connected, the output end of the third switch tube is grounded, the output end of the second switch tube, and the input end of the third switch tube are respectively connected to the audio output end.
  • the embodiments of the sensor microphone of the present application include all the technical solutions of all embodiments of the above-mentioned sensor microphone output protection circuit, and the achieved technical effects are also They are exactly the same and will not be repeated here.

Abstract

La présente demande concerne un circuit de protection de sortie de microphone de capteur et un microphone de capteur. Le microphone de capteur comprend un circuit de sortie d'amplification, une extrémité d'alimentation électrique et une extrémité de sortie audio, le circuit de sortie d'amplification est électriquement connecté respectivement à l'extrémité d'alimentation électrique et à l'extrémité de sortie audio. Le circuit de protection de sortie de microphone de capteur comprend un module de mesure de tension, un module de déclenchement à bas niveau et un module de commutation, une extrémité de mesure du module de mesure de tension étant connectée à l'extrémité d'alimentation électrique, une extrémité de sortie du module de mesure de tension étant électriquement connectée à une extrémité commandée du module de déclenchement à bas niveau, et une extrémité commandée du module de commutation étant électriquement connectée au module de déclenchement à bas niveau.
PCT/CN2022/141623 2022-02-28 2022-12-23 Circuit de protection de sortie de microphone de capteur, et microphone de capteur WO2023160202A1 (fr)

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CN202210186612.9 2022-02-28
CN202210186612.9A CN114567837B (zh) 2022-02-28 2022-02-28 传感器麦克风输出保护电路及传感器麦克风

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CN115361609A (zh) * 2022-08-30 2022-11-18 歌尔微电子股份有限公司 电子器件测试电路及麦克风阵列模块

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