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26 February 2010 An integrated CMOS dual lock-in amplifier for optoelectronic antigens detection
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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.
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Nam-Pyo Hong, Do-Gyun Kim, In-Il Jung, Ho-Hyun Son, Tae-Kyung Chung, Young-ki Choi, and Young-Wan Choi "An integrated CMOS dual lock-in amplifier for optoelectronic antigens detection", Proc. SPIE 7572, Optical Diagnostics and Sensing X: Toward Point-of-Care Diagnostics, 75720J (26 February 2010);

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