Open AccessDesign and manufacture of lock-in amplifier
Author(s) -
Zhonghui Xu,
Wei Zhao,
Laixian Peng,
Juan Chen
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1678/1/012003
Subject(s) - lock in amplifier , amplifier , signal (programming language) , microcontroller , signal conditioning , buffer amplifier , microcomputer , sample and hold , computer science , electronic engineering , noise (video) , automatic gain control , chip , electrical engineering , electrical impedance , computer hardware , engineering , power (physics) , electronic circuit , physics , cmos , quantum mechanics , artificial intelligence , image (mathematics) , programming language
This design realizes the excellent performance of lock-in amplifier in detecting weak signal, which is composed of signal conditioning circuit and MCU control module. The single chip microcomputer is used to control the AD sampling of the filtered DC component after multiplication operation, and the FPGA is used to realize the phase shift control. Finally, the amplitude of the signal to be measured can be obtained by eliminating the gain generated in the whole circuit with the measured amplitude. After testing, it has the advantages of high sensitivity, high input impedance and low noise, and can realize accurate measurement.