Temperature drift compensation device and method for measuring micro signal

Abstract

The invention discloses a temperature drift compensation device and a method for measuring the micro signal. The device comprises a first difference amplifier, a second difference amplifier, a third difference amplifier, an ADC amplification chip and a single chip, wherein the first difference amplifier is to carry out difference calculation of the first micro signal and the second micro signal to get the first difference micro signal. The second difference amplifier is to carry out difference calculation of the third micro signal and the forth micro signal to get the second difference micro signal. The third difference amplifier is to carry out difference calculation of the first micro signal and the second micro signal and to amplify the difference calculation to get the measuring characteristic signal. The ADC amplification chip amplifies the measuring characteristic signal and outputs to single chip. The product of the temperature coefficient of the first differential amplifier and that of the third differential amplifier and the temperature coefficient of the amplifier circuit chip are equal in size and opposite in sign. The temperature drift compensation device and method for measuring micro signal can eliminate the interference of temperature drift produced in measuring circuit to micro signal and improve the measurement accuracy of micro signal.

Description

technical field [0001] The invention relates to the technical field of signal measurement, in particular to a temperature drift compensation device and method for measuring micro-signals. Background technique [0002] The amplification of micro-signals is the basis of signal measurement and measurement. For micro-signals within 50mV, they cannot be directly used in chips such as AD sampling. They must be amplified by an amplifier circuit before they can be measured. Micro-signal measurement is often a difficult point in signal measurement. Micro-signals within 50mV are difficult to be detected by signal measurement circuits. Generally, the bioelectrical signals output by biosensors (such as blood sugar, body temperature, and heart rate biosensors in physical sign monitoring biosensors, etc.) are relatively weak. Since the measured bioelectrical signals are very weak, the measured bioelectrical signals must be amplified by an amplifier circuit. The signal can only be measure...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a temperature drift compensation device and method for measuring micro-signals, aiming to solve the problem of inaccurate measurement results caused by the temperature drift generated by the amplifier circuit when measuring weak signals

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