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Proceedings Paper

An integrated CMOS dual lock-in amplifier for optoelectronic antigens detection
Author(s): Nam-Pyo Hong; Do-Gyun Kim; In-Il Jung; Ho-Hyun Son; Tae-Kyung Chung; Young-ki Choi; Young-Wan Choi
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Paper Abstract

We have designed dual lock-in amplifier (LIA) circuits in 0.18 μm CMOS technology for antibody-antigens (IgG) detection using optoelectronics. The purpose of this work is to develop a lock-in amplifier integrated circuit (IC) using the dual phase scheme that detect the phase difference between the input signal and the reference signal although a phase shifter is absent. Our LIA consist of high gain amplifier, signal amplifier, and phase sensitive detection. Amplifier structure is based on two-stage differential operational amplifier (op-amp) with RC Miller compensation technique. By using the RC Miller compensation technique, we obtain 60° the phase margin of the op-amp. Here, the resistor works for increasing the unit gain bandwidth and the capacitor works for increasing the phase margin. The lock-in amplifier consume 8.6 mA from a 1.8 V supply.

Paper Details

Date Published: 26 February 2010
PDF: 9 pages
Proc. SPIE 7572, Optical Diagnostics and Sensing X: Toward Point-of-Care Diagnostics, 75720J (26 February 2010); doi: 10.1117/12.841860
Show Author Affiliations
Nam-Pyo Hong, Chung-Ang Univ. (Korea, Republic of)
Do-Gyun Kim, Chung-Ang Univ. (Korea, Republic of)
In-Il Jung, Chung-Ang Univ. (Korea, Republic of)
Ho-Hyun Son, Chung-Ang Univ. (Korea, Republic of)
Tae-Kyung Chung, Chung-Ang Univ. (Korea, Republic of)
Young-ki Choi, Chung-Ang Univ. (Korea, Republic of)
Young-Wan Choi, Chung-Ang Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7572:
Optical Diagnostics and Sensing X: Toward Point-of-Care Diagnostics
Gerard L. Coté, Editor(s)

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