Microphone system and amplifying circuit

Abstract

The invention discloses a microphone system and an amplifying circuit. The amplifying circuit comprises a buffer circuit, a conditioning circuit and a driving circuit, wherein the buffer circuit is used for buffering a first voltage signal so as to acquire a second voltage signal; the conditioning circuit is used for receiving the second voltage signal and outputting a third voltage signal; the driving circuit is used for driving the third voltage signal so as to acquire an output voltage signal. The conditioning circuit and the driving circuit form an active filtering structure, or the conditioning circuit independently forms an active filtering structure. Frequency characteristics of the active filtering structure provide supplementation and correction for frequency characteristics of the second voltage signal in a target frequency band, so that the microphone system is enabled to realize noise optimization and frequency response planarization in the target frequency band. Compared with the prior art, the embodiment of the invention further improves the signal to noise ratio of the microphone system while avoiding increase in processing difficulty, and increases the flatness of the system sensitivity in the frequency band. Meanwhile, the microphone system has the advantages of high flexibility and low cost.

Description

technical field [0001] The invention relates to the field of microphones, in particular to a microphone system and an amplifying circuit. Background technique [0002] Micro-Electro-Mechanical System (MEMS) is developed on the basis of semiconductor manufacturing technology and integrates technologies such as lithography, corrosion, thin film, silicon micromachining, non-silicon micromachining and precision machining. And realize the high-tech electro-mechanical system. MEMS systems generally include a micromechanically sensitive structure and associated circuitry for converting other physical signals into electrical signals. In order to meet the increasing material and cultural needs of the people, the volume, cost, sensitivity, linearity and other indicators of the MEMS system are constantly optimized and improved. [0003] MEMS microphones are widely used in various electronic devices, such as mobile phones, MP3 players, recorders, and monitoring equipment, due to their...

AI Technical Summary

Problems solved by technology

However, due to the limitations of package size and sensitive structure processing technology, the existing technology has certain difficulties in implementation

For example, as the size of the package becomes smaller and smaller, the range in which the volume of the back cavity of the sensitive structure can be increased becomes more and more limited; the method of changing the parameters of the sensitive structure by reducing the thickness of the diaphragm of the sensitive structure will also bring new benefits to the MEMS processing factory. very difficult to process

Images