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Microphone circuit, microphone module and microphone sound pressure overload point lifting method

A microphone and circuit technology, applied to electrostatic transducer microphones, electrical components, electrostatic sensors, etc., can solve the problems of output sound distortion, microphone circuit linearity deterioration, and deterioration, so as to achieve good electrical signals and improve microphone sound Overload point, good effect of total harmonic distortion performance

Active Publication Date: 2022-07-01
AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the sound pressure of the microphone Mic is too high, the output signal Vout is clamped by the power supply voltage VDD and the ground GND, resulting in deterioration of the linearity of the microphone circuit in the related art, that is, the deterioration of the total harmonic distortion (THD), resulting in The output sound of smart mobile devices using this microphone circuit is distorted

Method used

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  • Microphone circuit, microphone module and microphone sound pressure overload point lifting method
  • Microphone circuit, microphone module and microphone sound pressure overload point lifting method
  • Microphone circuit, microphone module and microphone sound pressure overload point lifting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An embodiment of the present invention provides a microphone circuit 100 .

[0044] see figure 2 , figure 2 It is a schematic diagram of a circuit module of the microphone circuit of the present invention. The microphone circuit 100 includes an amplifier 1 , a bias resistor R1 and a bias network module 2 .

[0045] The amplifier 1 is used for receiving the signal Vin output by the external microphone Mic, and amplifying the signal Vin and outputting it.

[0046] The first end of the bias resistor R1 is used to connect to a preset bias voltage Vbias; the second end of the bias resistor R1 is used to connect to the output end of the microphone Mic, and the bias resistor R1 The second terminal of is connected to the input terminal of the amplifier 1. The input terminal of the amplifier 1 serves as the input terminal of the microphone circuit 100 . The output terminal of the amplifier 1 serves as the output terminal of the microphone circuit 100 .

[0047] The bias ...

Embodiment 2

[0052] The second embodiment of the present invention provides a microphone circuit 200 . The microphone circuit 200 is a specific circuit of the microphone circuit 100 in the first embodiment.

[0053] see image 3 , image 3 It is a circuit diagram of the second embodiment of the microphone circuit 200 of the present invention.

[0054] The amplifier 1 includes a constant current source IB and a first transistor M1. The first transistor M1 is a PMOS transistor. In the second embodiment, the amplifier 1 is a source follower.

[0055] The input terminal of the constant current source IB is connected to the power supply voltage VDD.

[0056] The output terminal of the constant current source IB is connected to the source of the first transistor M1.

[0057] The source of the first transistor M1 and the output end of the constant current source IB serve as the output end of the microphone circuit 100 .

[0058] The gate of the first transistor M1 serves as the input termi...

Embodiment 3

[0070] The third embodiment of the present invention provides a microphone circuit 300 .

[0071] see Figure 4 , Figure 4 It is a circuit diagram of the third embodiment of the microphone circuit 300 of the present invention. The difference between the microphone circuit 300 and the microphone circuit 200 in the second embodiment is that: the bias network module 2 further includes an nth bias network circuit 2n, where n is a positive integer and satisfies: n≥2; The bias network circuit includes an nth PMOS transistor MPn, an nth NMOS transistor MNn and an nth impedance Zn.

[0072] The source of the nth PMOS transistor MPn is used to connect to the nth lower bias voltage VBnp, and the drain of the nth PMOS transistor MPn is respectively connected to the drain of the nth NMOS transistor MNn and the nth impedance Zn. first end.

[0073] The gate of the nth PMOS transistor MPn is used to connect to the input end of the microphone circuit, and the gate of the nth PMOS transi...

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Abstract

The invention provides a microphone circuit. The microphone circuit comprises an amplifier, a bias resistor and a bias network module connected with the input end of the microphone circuit. The amplifier is used for receiving a signal output by an external microphone, amplifying the signal and outputting the amplified signal; the first end of the bias resistor is used for being connected to a preset bias voltage; the second end of the bias resistor is used for connecting the output end of the microphone; the bias network module is used for judging the voltage value of the signal, and if the voltage value of the signal exceeds the voltage value range of a preset threshold voltage group, the impedance corresponding to the bias network module is connected to the input end of the microphone circuit so as to reduce the amplitude of the signal; wherein the impedances are in one-to-one correspondence with the threshold voltage groups. According to the microphone module and the microphone sound pressure overload point improving method provided by the invention, compared with the prior art, the technical scheme of the invention improves the microphone sound pressure overload point and has good electrical performance.

Description

【Technical field】 [0001] The present invention relates to the technical field of microphone circuits, and in particular, to a microphone circuit, a microphone module and a method for increasing the sound pressure overload point of a microphone applied to a microphone. 【Background technique】 [0002] With the increasing application of smart mobile devices. Microphones for converting sound into electrical signals are increasingly important. The microphone circuit that drives the output of the microphone signal affects the effect and performance of the smart mobile device. [0003] Please refer to figure 1 shown, figure 1 It is a schematic diagram of a circuit module of a microphone circuit of the related art. A related art microphone circuit includes an amplifier AMP and a resistor R. The amplifier AMP is used for receiving the signal Vin output by the external microphone Mic, amplifying the signal Vin and outputting, and the output signal is Vout. The first end of the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/04H04R19/00H04R3/04
CPCH04R19/04H04R19/005H04R3/04Y02D30/70
Inventor 韩冬蔡东记
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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