Physiological signal conditioning circuit and physiological signal acquisition system

Abstract

The invention provides a physiological signal conditioning circuit and a physiological signal acquisition system. The physiological signal conditioning circuit comprises a first amplifying circuit, a DC cancellation circuit, a second amplifying circuit and a charge retention circuit which are sequentially connected. The input end of the first amplifying circuit is connected to the output end of a physiological signal detection module. The output end of the charge retention circuit is connected to the input end of an ADC (analog-to-digital converter). The physiological signal detection module is used for detecting a to-be-detected object and for outputting a physiological signal. According to the physiological signal conditioning circuit and the physiological signal acquisition system provided by the invention, a subsequent ADC effective sampling time is greatly prolonged due to the charge retention circuit, so that high-resolution and high-precision analog-to-digital conversion is achieved, and meanwhile power consumption is reduced.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a physiological signal conditioning circuit and a physiological signal acquisition system. Background technique [0002] In order to understand people's physical health, it is often necessary to collect some physiological signals. For example, electrocardiogram (ECG) signals and pulse wave (PPG) signals are important physiological signals, which contain rich physiological and pathological information of the human body and can reflect the health status of the human cardiovascular system. By collecting and analyzing ECG signals and PPG signals, we can keep abreast of the health status of the human body. [0003] In existing physiological signal collection systems, the collected physiological signals are usually converted from analog to digital by an analog-to-digital converter (ADC). Since the conversion speed of the ADC is usually low, if you want to obtain high effective bits (...

AI Technical Summary

Problems solved by technology

Since the conversion speed of the ADC is usually low, if you want to obtain high effective bits (that is, high ADC accuracy), you need to increase the sampling time of the ADC, and then you need to increase the acquisition time of the physiological signal, which will cause the power consumption of the physiological signal acquisition system higher

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