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A 0.5-Hz High-Pass Cutoff Dual-Loop Transimpedance Amplifier for Wearable NIR Sensing Device

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4 Author(s)
Wong, A.K.Y. ; Res. Center for Biomed. Eng., Chinese Univ. of Hong Kong, Shatin, China ; Ka Nang Leung ; Kong-Pang Pun ; Yuan-Ting Zhang

This brief describes a fully integrated dual-loop transimpedance amplifier with bandpass response for wearable near-infrared (NIR) sensing operating at low frequency: one loop to lower the lower band cutoff frequency and another loop for self-regulating DC photocurrent to prevent saturation at later stages. The circuit was implemented in a 0.35- \mu\hbox {m} CMOS process and achieved a DC photocurrent rejection ranging from 2.7 to 15 \mu\hbox {A} and a - 3-dB high-pass cutoff frequency from 0.5 to 110 Hz by using on-chip capacitors. Both total harmonic distortion and spurious-free dynamic range are better than - 42 dB. It achieves an improvement of 390 times in capacitor reduction compared with the traditional DC rejection technique.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:57 ,  Issue: 7 )