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Sensitivity adjusting system and sensitivity adjusting method of silicon microphone

A technology for silicon microphones and adjustment systems, applied in electrical components and other directions, can solve the problems of increased packaging costs, incompatibility, unfavorable size of silicon microphones, etc., and achieves the effect of simple production

Active Publication Date: 2012-07-25
AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A general silicon microphone has 3 pins, namely a power supply pin, a ground pin, and an output pin. In order to adjust the sensitivity after the silicon microphone is packaged, this type of silicon microphone needs to add an extra pin to accept Sensitivity correction parameter information, but the additional pins are not conducive to reducing the size of silicon microphones, increasing additional packaging costs, and are not suitable for compatibility with existing products

Method used

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  • Sensitivity adjusting system and sensitivity adjusting method of silicon microphone
  • Sensitivity adjusting system and sensitivity adjusting method of silicon microphone
  • Sensitivity adjusting system and sensitivity adjusting method of silicon microphone

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] see figure 1 , the test index of the sensitivity of the packaged silicon microphone is mainly related to two factors, the gain of the preamplifier circuit and the bias voltage value, so their values ​​need to be set according to the test results of the silicon microphone. This figure is a schematic diagram of the pins of the silicon microphone provided by the present invention. The silicon microphone includes a power pin P, a ground pin G and an output pin 0 . In the present invention, the output pin 0 is changed into an input and output pin to realize the input and output functions without adding extra pins, so that the packaging production of the silicon microphone is more convenient.

[0022] see figure 2 , image 3 and Figure 4 , the present invention provides a silicon microphone sensitivity adjustment system using the output port of t...

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Abstract

The invention provides a sensitivity adjusting system and a sensitivity adjusting method of a silicon microphone. The sensitivity adjusting system comprises a sensor module, a pre-amplifier module, a voltage detecting module, a one-time programmable array module, a reading circuit module, a logic control circuit module and an external software module. Input and output functions are realized by output pins of the silicon microphone, extra pins are omitted and high-performance silicon microphones can be produced more conveniently.

Description

【Technical field】 [0001] The invention relates to the field of sensitivity adjustment of an electroacoustic transducer, in particular to a sensitivity adjustment system and an adjustment method of a silicon microphone. 【Background technique】 [0002] Compared with traditional electret microphones, silicon microphones have small temperature drift, small size, high-temperature PCB mounting, insensitivity to mechanical vibration, and low power consumption. These advantages make silicon microphones popular in consumer electronics and hearing aids. Field favor. [0003] Due to the influence of factors such as silicon microphone technology and packaging, the sensitivity of the finally manufactured silicon microphone shows a certain deviation, such as ±4dB. Such deviations are unacceptable in some applications, which require sensitivity deviations in smaller intervals, such as ±1dB. A general silicon microphone has 3 pins, namely a power supply pin, a ground pin, and an output pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 杨勇刚林海
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD