Analog front-end circuit with low power consumption for medical equipment

Abstract

The invention discloses an analog front-end circuit with low power consumption for medical equipment. The analog front-end circuit comprises an automatic gain control (AGC) loop (10) with low power consumption and high precision and a second-order three-bit quantitative Sigma-Delta analog to digital converter (ADC) (20), wherein the AGC loop (10) is used for adjusting a microphone signal to a reasonable signal amplitude range; and the second-order three-bit quantitative Sigma-Delta ADC (20) is used for converting an analog signal to a digital code and outputting the digital code to a DSP (digital signal processor) for processing. With the adoption of three-level comparison, the mixed analog-digital AGC loop and a single-chip full integration of the second-order three-bit quantitative Sigma-Delta ADC, the analog front-end circuit with low power consumption for the medical equipment can be realized. The analog front-end circuit has the advantages of high precision, strong configurability and low power consumption in the entire circuit, and is applied to the systems of the medical equipment.

Description

Technical field [0001] The invention relates to the technical field of CMOS analog integrated circuit design, in particular to a low power consumption analog front end circuit for medical equipment. Background technique [0002] In modern society, more and more people are suffering from hearing impairment. According to authoritative reports, there are currently up to 30 million people in the world facing hearing impairment, and the total number is still growing rapidly. Therefore, people urgently need a low-cost, high-performance hearing aid system to alleviate or even solve various problems caused by hearing impairment. As the most important module of the input end of the hearing aid system, the analog front end has received more and more attention for its new architecture and design method. At present, the automatic gain control loop, which is widely used in the analog front end of medical hearing aid equipment, mostly uses a fully customized analog circuit to achieve feedback...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a low-power analog front-end circuit for medical equipment, so as to solve the problems of insufficient noise, precision and power consumption of the existing analog front-end circuit of medical equipment, so that the circuit can achieve low Noise, High Accuracy, Low Power Consumption

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