Research On Small Signal Magnify-Chain Circuit Based On Pressure Bridge
Jian Huang, Hui Fan · Advances in engineering research/Advances in Engineering Research · 2016
Weak small signal acquisition is particularly important in electronic design and data acquisition.Effective processing of small signals must be magnified, while magnifying small signals can produce interference magnification and cause errors.In order to solve the interference and detune in small signal magnification, based on the scrutiny of small signal features, this paper suggests the adoption of precision meter amplifier and auto-return-to-zero technology to magnify the weak signal.The precision meter amplifier can realize the higher common mode rejection ratio, and the auto-return-to-zero technology can reduce the detune errors.Accordingly, the both combination can realize the stable and effective magnification of 110 times of the weak signals.The test results indicated that under TINA-TI, the simulation was carried out so that the millivolt grade signal could be magnified to several volts steadily and the interference and errors can be suppressed effectively.This design is of certain practicality and reference values, and provides a kind of new thinking and designing method for studying small signal magnifying chain circuit.