A 0.5-Hz high-pass cutoff dual-loop transimpedance amplifier for wearable NIR sensing device
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AbstractThis 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-μm CMOS process and achieved a DC photocurrent rejection ranging from 2.7 to 15 μmA 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. © 2006 IEEE.
All Author(s) ListWong A.K.Y., Leung K.N., Pun K.-P., Zhang Y.-T.
Journal nameIEEE Transactions on Circuits and Systems II: Express Briefs
Volume Number57
Issue Number7
PublisherInstitute of Electrical and Electronics Engineers
Place of PublicationUnited States
Pages531 - 535
LanguagesEnglish-United Kingdom
KeywordsDirect-current (DC) photocurrent rejection, near-infrared (NIR) sensor, photoplethysmogram (PPG), physiological signal acquisition

Last updated on 2021-19-09 at 23:43