MEMS microphone biasing circuit and MEMS microphone

A bias circuit and microphone technology, which is applied in transducer circuits, sensor protection circuits, electrical components, etc., can solve problems such as low sensitivity and unstable signals of microphone bias circuits, and achieve low noise, good stability and Effects of sensitivity and bias voltage stabilization

Pending Publication Date: 2021-10-29
GOERTEK MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of the embodiments of the present disclosure is to provide a MEMS microphone bias circuit and MEMS microphone, which can solve the problem of unstable signal and low sensitivity of the existing microphone bias circuit

Method used

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  • MEMS microphone biasing circuit and MEMS microphone
  • MEMS microphone biasing circuit and MEMS microphone
  • MEMS microphone biasing circuit and MEMS microphone

Examples

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Embodiment Construction

[0024] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0026] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

[0027] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have di...

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Abstract

The invention relates to an MEMS microphone biasing circuit which is characterized by comprising an oscillator, a clock amplitude adjusting module, a reference voltage module and a charge pump set, the output end of the oscillator is connected with the input end of the clock amplitude adjusting module, and the oscillator is used for sending a clock signal to the clock amplitude adjusting module; the output end of the clock amplitude adjusting module is connected with the charge pump set, and the clock amplitude adjusting module is used for adjusting the amplitude of the clock signal; the reference voltage module is connected with the charge pump set and used for providing input voltage for operation of the charge pump set. The charge pump set comprises a preceding-stage charge pump and an output-stage charge pump, the preceding-stage charge pump is located at the input end of the charge pump set, the output-stage charge pump is located at the output end of the charge pump set, and the charge pump set is used for outputting bias voltage to be processed. And stable bias voltage can be output, so that the MEMS microphone has good sensitivity.

Description

technical field [0001] Embodiments of the present disclosure relate to the technical field of microphone circuits, and more specifically, to a MEMS microphone bias circuit and the MEMS microphone. Background technique [0002] MEMS (Micro-Electro-Mechanical System, Micro-Electro-Mechanical System) microphones need a stable and low-noise bias voltage to convert the mechanical deformation caused by the sound pressure acting on the MEMS chip diaphragm into an electrical signal of a certain amplitude. The bias voltage is about 10V, which is much higher than the power supply voltage, so a circuit module is required to generate a DC level much higher than the power supply voltage to provide the bias voltage for the MEMS chip. [0003] The stability of the bias voltage will directly affect the sensitivity of the microphone, and the noise of the bias voltage will also affect the noise of the electrical signal output by the MEMS microphone. Therefore, in the design process of the bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/04H04R3/00
CPCH04R19/04H04R3/007H04R2201/003
Inventor 刘洋王艳梅
Owner GOERTEK MICROELECTRONICS CO LTD
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