A chopper amplifier with a low duty‐cycle sub‐sampling in the switched‐capacitor integrator for noise reduction

نویسندگان

چکیده

This letter presents a low-noise implementation of the switched-capacitor (SC) DC servo loop (DSL) in capacitively-coupled chopper instrumentation amplifier (CCIA). The noise SC integrator DSL is first analyzed, then low duty-cycle subsampling and unbalanced capacitor ratio are proposed to reduce noise. Fabricated 65 nm CMOS process, CCIA achieves 2.5 μVrms input-referred noise, integrated from 0.5 Hz 250 Hz, 110 mV electrode-DC offset cancellation range. Besides, calculated well matches measured, which proves analysis. Compared with prior designs adopting similar integrators, this work reduces level by 2x increases range 2x. article protected copyright. All rights reserved

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ژورنال

عنوان ژورنال: Electronics Letters

سال: 2023

ISSN: ['0013-5194', '1350-911X']

DOI: https://doi.org/10.1049/ell2.12774