Vahid Khojasteh Lazarjan, Marie-Eve Crochetiere, Mehdi Noormohammadi Khiarak, Saeed Ghaneei Aarani, Seyedeh Nazila Hosseini, Gabriel Gagnon-Turcotte, Pierre Marquet, Benoit Gosselin
This paper presents a high-precision CMOS fluorescence photometry sensor using a novel lock-in amplification scheme based on switched-biasing and ping-pong auto-zeroing techniques. The CMOS sensor includes two photodiodes and a lock-in amplifier (LIA) operating at 1 kHz. The LIA comprises a differential low-noise amplifier using a novel switched-biasing ping-pong auto-zeroed scheme, an automatic phase aligner, a programmable gain amplifier, a band-pass filter, a mixer, and an output low-pass filter. The design is fabricated in 0...
April 16, 2024: IEEE Transactions on Biomedical Circuits and Systems