IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Significantly enhanced sensor signal detection method using harmonic frequency in lock-in amplifier
Su-Jin JeonJihoon KimEudum KimSun-Ho KimDo-Hyun KimYoung-Wan Choi
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2018 Volume 15 Issue 19 Pages 20180657

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Abstract

In this study, we present a significantly enhanced signal detection method using harmonic frequency in a lock-in amplifier (LIA). This method reduces the effect of flicker noise that limits the signal-to-noise ratio in a conventional DC-based LIA. Furthermore, it has a definite advantage that it is not necessary to match the phase between the input and the reference signals. To verify such merits, we constructed a hybrid LIA circuit and conducted experiments. The results demonstrated that the dynamic range improved by approximately 43 dB compared to a conventional DC-based LIA. Moreover, the harmonic LIA output is successfully obtained regardless of the phase difference.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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