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Proceedings Paper

Analysis on frequency response of trans-impedance amplifier (TIA) for signal-to-noise ratio (SNR) enhancement in optical signal detection system using lock-in amplifier (LIA)
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Paper Abstract

Lock-in amplifier (LIA) has been widely used in optical signal detection systems because it can measure small signal under high noise level. Generally, The LIA used in optical signal detection system is composed of transimpedance amplifier (TIA), phase sensitive detector (PSD) and low pass filter (LPF). But commercial LIA using LPF is affected by flicker noise. To avoid flicker noise, there is 2ω detection LIA using BPF. To improve the dynamic reserve (DR) of the 2ω LIA, the signal to noise ratio (SNR) of the TIA should be improved. According to the analysis of frequency response of the TIA, the noise gain can be minimized by proper choices of input capacitor (Ci) and feed-back network in the TIA in a specific frequency range. In this work, we have studied how the SNR of the TIA can be improved by a proper choice of frequency range. We have analyzed the way to control this frequency range through the change of passive component in the TIA. The result shows that the variance of the passive component in the TIA can change the specific frequency range where the noise gain is minimized in the uniform gain region of the TIA.

Paper Details

Date Published: 20 February 2017
PDF: 7 pages
Proc. SPIE 10107, Smart Photonic and Optoelectronic Integrated Circuits XIX, 1010713 (20 February 2017); doi: 10.1117/12.2250731
Show Author Affiliations
Ji-Hoon Kim, Chung-Ang Univ. (Korea, Republic of)
Su-Jin Jeon, Chung-Ang Univ. (Korea, Republic of)
Myung-Gi Ji, Chung-Ang Univ. (Korea, Republic of)
Jun-Hee Park, Chung-Ang Univ. (Korea, Republic of)
Young-Wan Choi, Chung-Ang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 10107:
Smart Photonic and Optoelectronic Integrated Circuits XIX
Louay A. Eldada; El-Hang Lee; Sailing He, Editor(s)

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