Digital preamplifier for MEMS microphone

A preamplifier, digital technology, used in DC-coupled DC amplifiers, differential amplifiers, instruments, etc., can solve problems such as a large number of design costs, physical space and design time, signal quality degradation, and poor anti-interference ability of analog signals.

Inactive Publication Date: 2010-02-03
INST OF ACOUSTICS CHINESE ACAD OF SCI
View PDF3 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In analog technology, due to the poor anti-interference ability of analog signal itself, it is inevitably affected by radio frequency, electromagnetic interference and power supply noise, whic

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital preamplifier for MEMS microphone
  • Digital preamplifier for MEMS microphone
  • Digital preamplifier for MEMS microphone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] According to the present invention there is provided a digital preamplifier for MEMS microphones, comprising: a single-ring single-bit Sigma Delta modulator in conjunction with a CT / SC integrator structure; a bandgap reference, low dropout linear regulator, charge MEMS polarized voltage generation modules for pumps, passive low-pass filters; for portable applications, digital preamplifiers with wide voltage swing support, sleep mode, and low-dropout linear regulators with clock frequency switching.

[0021] The digital preamplifier needs to complete the impedance matching, variable gain amplification and analog-to-digital conversion functions of the MEMS microphone. The present invention modifies the traditional single-ring single-bit Sigma Delta modulator switched capacitor (SC) integrator structure, using continuous time ( The CT) integrator replaces the first-stage SC integrator, and the voltage feedback in the SC integrator is replaced by the current feedback of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a digital preamplifier for an MEMS microphone, which comprises an Sigma Delta modulator and an MEMS polarization voltage generation module, wherein a first-stage integrator ofthe Sigma Delta modulator adopts a structure of a continuous time integrator, and various stages of integrators after the second stage adopt a structure of a switched-capacitor integrator; an input end of the continuous time integrator adopts a gate differential input circuit; and a wake source of the gate differential input circuit is connected with an integrating resistor and a feedback currentof the continuous time integrator respectively. The digital preamplifier meets the requirement of a new-generation advanced audio system on the input end, greatly promotes the anti-jamming ability ofthe conventional analog signal transmission path, improves the transmission quality of analog signals, and reduces physical space and design cost.

Description

technical field [0001] The invention relates to the field of MEMS audio sensors, in particular to a digital preamplifier used for MEMS microphones. Background technique [0002] An audio sensor (also known as a microphone) is a device that converts an external audio signal into a weak electrical signal. The design of traditional microphones is analog. A series of analog devices complete the amplification, modulation and synthesis of electrical signals. In most cases, the analog signals are converted into digital signals through analog-to-digital conversion for subsequent processing. In analog technology, due to the poor anti-interference ability of analog signal itself, it is inevitably affected by radio frequency, electromagnetic interference and power supply noise, which makes the quality of the signal degrade on the transmission path. In order to ensure qualified signal quality, a lot of additional design costs are required , physical space and design time. [0003] The...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04R3/00H03F3/45G05F1/46
Inventor 刘岩王东辉华斯亮范兵侯朝焕
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap