Wide EDO handling range chopper amplifier based on high linearity PRs bulk-feedback DSL

Sizhe Hu; Weilin Xu; Jueyong Zhu; Baolin Wei; Xueming Wei

doi:10.1117/12.3015257

16 January 2024 Wide EDO handling range chopper amplifier based on high linearity PRs bulk-feedback DSL

Sizhe Hu, Weilin Xu, Jueyong Zhu, Baolin Wei, Xueming Wei

Proceedings Volume 12973, Workshop on Electronics Communication Engineering (WECE 2023); 1297302 (2024) https://doi.org/10.1117/12.3015257
Event: Workshop on Electronics Communication Engineering (WECE 2023), 2023, Guilin, China

Abstract

Although conventional structure Pseudo Resistors (PRs) can provide high value resistance in a small chip area, they still need to be improved in terms of linearity. A new PR structure with good frequency characteristics and high linearity was proposed for Capacitively-coupled Chopper Instrumentation Amplifier (CCIA). On the other hand, CCIA using a classical analog DC-servo loop (DSL) can only block biological Electrode DC Offset (EDO) ±50mV or so. To calibrate a larger EDO in a dry gel application, a bulk feedback DSL with the new structure PR is proposed which uses the parasitic capacitance at the input of the amplifier and the body effect to block the EDO. The CCIA was designed using a 180nm CMOS process. It occupies only 0.27mm² chip area and consumes 5.4μA current from a 1.8V supply. Its input-referred noise varies from 0.44 to 2.2μVrms, total harmonic distortion of 60dB. It can calibrate ±300mV EDO and the maximum capacitance required for digital DSL is 1.37pF. Compared with the traditional DSL method, the capacitor area is reduced by 29%.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Sizhe Hu, Weilin Xu, Jueyong Zhu, Baolin Wei, and Xueming Wei "Wide EDO handling range chopper amplifier based on high linearity PRs bulk-feedback DSL", Proc. SPIE 12973, Workshop on Electronics Communication Engineering (WECE 2023), 1297302 (16 January 2024); https://doi.org/10.1117/12.3015257

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