Low cost lock-in amplifier solutions

The analog part of the lock-in amplifier consists in three units: the measuring channel, the synchronization channel and one or two PSD (phase sensitive detector) circuits. For low frequency applications, the PSD circuit can be build with ordinary operational amplifiers and CMOS multiplexers. The pa...

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Bibliographic Details
Published in2017 IEEE 23rd International Symposium for Design and Technology in Electronic Packaging (SIITME) pp. 118 - 121
Main Authors Belea, Radu, Epure, Silviu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Amplifiers
DDT (direct digital synthesis)
Detectors
Frequency measurement
LIA (lock-in amplifier)
Mathematical model
measuring channel
Phase measurement
PSD (phase sensitive detector)
Synchronization
synchronization channel
Voltage measurement
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Summary:The analog part of the lock-in amplifier consists in three units: the measuring channel, the synchronization channel and one or two PSD (phase sensitive detector) circuits. For low frequency applications, the PSD circuit can be build with ordinary operational amplifiers and CMOS multiplexers. The paper presents a study of the proposed PSD circuit and two examples: a conditioner for the LVDT (linear variable differential transformer) sensor, and an device which together with a laboratory DDT (direct digital synthesis) signal generator can measure the gain-frequency and phase-frequency diagrams (Bode diagrams) of an electric circuit.
DOI:10.1109/SIITME.2017.8259871