Transimpedance amplifier for wearable PPG signal detection

Abstract

The invention relates to a transimpedance amplifier for wearable PPG signal detection. The transimpedance amplifier comprises a main transimpedance amplifier body, an auxiliary transimpedance amplifier body and a comparator; the first output end of the auxiliary transimpedance amplifier body is connected with the main transimpedance amplifier body to provide bias voltage for the main transimpedance amplifier body, the second output end of the auxiliary transimpedance amplifier body is connected with the positive input end of the comparator to provided input reference voltage for the comparator, the negative input end of the comparator is connected with the output end of the main transimpedance amplifier body, and the output end of the comparator is connected with the main transimpedance amplifier body; and the comparator is used for comparing the output voltage of the main transimpedance amplifier body with the reference voltage provided by the auxiliary transimpedance amplifier body and outputting a binary signal, and then the amplification factor of the main transimpedance amplifier body is changed to achieve automatic gain control. The transimpedance amplifier has the advantagesof being low in power consumption, small in occupied area and the like on the premise of achieving basis functions.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and more specifically relates to a transimpedance amplifier suitable for wearable PPG signal detection. Background technique [0002] Photoplethysmography (PPG) is a technology that uses photoelectric sensors to detect the difference in the intensity of reflected light absorbed by human blood and tissues, and to trace the changes in blood vessel volume during the cardiac cycle. By detecting the PPG signal, the blood oxygen and blood pressure of the human body can be measured in real time. Traditional PPG signal detection devices have relatively large power consumption and size, and are only suitable for hospitals, and are difficult to enter communities or even families. Based on this, the wearable PPG signal detection device has good development value and application prospect. Contents of the invention [0003] The object of the present invention is to provide a transimpeda...

AI Technical Summary

Problems solved by technology

Traditional PPG signal detection devices have relatively large power consumption and size, which are only suitable for hospitals and difficult to enter communities or even families.

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