Design of a lock-amplifier circuit

H. Liu; W. J. Huang; X. Song; W. Y. Zhang; L. B. Sa

doi:10.1117/12.2266004

23 January 2017 Design of a lock-amplifier circuit

H. Liu, W. J. Huang, X. Song, W. Y. Zhang, L. B. Sa

Proceedings Volume 10322, Seventh International Conference on Electronics and Information Engineering; 1032248 (2017) https://doi.org/10.1117/12.2266004
Event: Seventh International Conference on Electronics and Information Engineering, 2016, Nanjing, China

Abstract

The lock-in amplifier is recovered by phase sensitive detection technique for the weak signal submerged in the noise background. This design is based on the TI ultra low power LM358, INA129, OPA227, OP07 and other chips as the core design and production of the lock-in amplifier. Signal generator by 10m ohms /1K ohm resistance points pressure network 10 mu V ~ 1mV adjustable sine wave signal s (T). The concomitant interference signal together through the AC amplifier and band-pass filter signal x (T), on the other hand reference signal R (T) driven by square wave phase shift etc. steps to get the signal R (T), two signals and by phase sensitive detector are a DC full wave, again through its low pass filter and a DC amplifier to be measured signal more accurate detection, the final circuit through the AD conversion and the use of single-chip will display the output.

Citation Download Citation

H. Liu, W. J. Huang, X. Song, W. Y. Zhang, and L. B. Sa "Design of a lock-amplifier circuit", Proc. SPIE 10322, Seventh International Conference on Electronics and Information Engineering, 1032248 (23 January 2017); https://doi.org/10.1117/12.2266004

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