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A Silicon Microphone Amplifier that Cancels Charge-Pump Noise

A silicon microphone and charge pump technology, applied in the field of microphones, can solve problems such as prominent charge pump noise, and achieve the effect of eliminating thermal noise

Active Publication Date: 2018-09-25
SHANDONG GETTOP ACOUSTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the charging speed and capacitor area, the noise of the charge pump cannot be reduced infinitely, so the noise of the charge pump becomes prominent in the microphone system with high signal-to-noise ratio

Method used

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  • A Silicon Microphone Amplifier that Cancels Charge-Pump Noise
  • A Silicon Microphone Amplifier that Cancels Charge-Pump Noise
  • A Silicon Microphone Amplifier that Cancels Charge-Pump Noise

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] figure 2 It is a block diagram of a silicon microphone amplifier module that can eliminate charge pump noise according to an embodiment of the present invention; as shown in the figure, the silicon microphone amplifier includes a charge pump 201, an input buffer 202, a bias buffer 203, a bias match 204, and 205 and regulated power supply 209. The output terminal of the charge pump 201 is connected to the high-voltage bias terminal 206 of the silicon m...

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Abstract

The invention discloses a silicon microphone amplifier capable of eliminating noise of a charge pump. The silicon microphone amplifier comprises the components of a charge pump, an input buffer, a bias buffer, a bias matching module, an amplifier and a stabilized power supply. The output end of the charge pump is connected with the high-voltage bias end of a silicon microphone device and is used for generating high-voltage bias and biasing the silicon microphone to an appropriate working voltage. The output end of the charge pump is furthermore connected with the input end of the bias matching module. The bias matching module is used for performing attenuation with a specific gain on the noise of the charge pump, thereby matching attenuation of the nose of the charge pump through a signal pathway which comprises the silicon microphone device and an input pad. The input buffer is connected with the input end of the silicon microphone device for realizing conversion between capacitance and voltage. The bias buffer is connected with the output end of the bias matching module for realizing conversion between capacitance and voltage. The amplifier is used for performing differential amplification on the output signal of the input buffer and the output signal of the bias buffer, thereby amplifying a useful voltage signal and inhibiting the noise of the charge pump.

Description

technical field [0001] The invention relates to the field of microphones, in particular to a silicon microphone amplifier capable of eliminating charge pump noise. Background technique [0002] Silicon microphones are widely used in consumer electronics fields such as mobile phones, notebook computers, and tablet computers due to their advantages of small size and reflow soldering surface mount. With the popularization of smart phones and smart homes, silicon microphones with high signal-to-noise ratio are becoming more and more popular. The silicon microphone system consists of two parts: a silicon microphone device and an amplifier chip. The silicon microphone device completes the conversion of the sound signal to the capacitance change signal. On the one hand, the amplifier chip generates a high-voltage bias voltage to bias the silicon microphone device in a suitable working state to improve the sensitivity of the silicon microphone. On the other hand, it completes the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/04H04R3/02H03F3/45
Inventor 孙丽娜杨少军
Owner SHANDONG GETTOP ACOUSTIC
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