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Feedback compensated synchronous and multiplier type phase sensitive detectors

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3 Author(s)
H. O. Modi ; Dept. of Electr. Eng., Indian Inst. of Technol., Madras, India ; V. J. Kumar ; P. Sankaran

A feedback technique for phase sensitive detection (PSD) is developed, which is suitable for both synchronous and multiplier modes of implementation. The feedback-compensated PSD straightaway provides a DC output proportional to the amplitude of the measurand. The technique is very useful in a noisy environment where post-processing of the in-phase and quadrature components would otherwise deteriorate the stability, accuracy, and sensitivity. Quantitative comparison of the extent of compensation obtained experimentally with that estimated by PC-simulation indicates good agreement

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:40 ,  Issue: 3 )