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- Title
A 50nV/√Hz 2‐channel time multiplexed bio‐chopper amplifier with current‐attenuated feedback resistor.
- Authors
Yuk, Beomjin; Kim, Byeongseol; Bae, Joonsung
- 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.
- Subjects
POWER amplifiers; RADIO attenuators; ACCURACY; CHOPPER circuits; MULTIPLEXING
- Publication
Electronics Letters (Wiley-Blackwell), 2022, Vol 58, Issue 5, p191
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/ell2.12400