A 50nV/√Hz 2‐channel time multiplexed bio‐chopper amplifier with current‐attenuated feedback resistor. Issue 5 (10th December 2021)

• Record Type: Journal Article
• Authors: Yuk, Beomjin; Kim, Byeongseol; Bae, Joonsung
• Is Part Of: Electronics letters. Volume 58:Issue 5(2022)
• Page Start: 191
• Page End: 193
• Publication Date: 2021-12-10
• Subjects: Electronics -- Periodicals; 621.381
• DOI: 10.1049/ell2.12400
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract: This paper presents 2‐channel time‐multiplexed chopper instrument amplifier for better gain accuracy and mismatch. Mostly, the current‐attenuated feedback resistor with a duty‐cycled resistor is adopted for boosting the RC time constant. It can achieve the high pass corner frequencies between 10 Hz and 320 Hz by a 3‐bit digitally controlled resistor bank of the attenuator. As a result, the instrument amplifier achieves 0.6% gain accuracy between two time‐multiplexed channels, 100 dB CMRR, ‐40 dB crosstalk, and noise densities of 50nV/√Hz. It is implemented in a 180‐nm CMOS technology. It occupies a 0.6 mm*0.6 mm chip area and consumes 1.5μA current consumption from a 1.8 V supply for each channel.