Preamplifier Design Strategies for Capacitive Sensing of Electrophysiological Signals

Yijing Zhang, Sotir Ouzounov, Mohammed Meftah, Eugenio Cantatore, Pieter Harpe

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

2 Citaten (Scopus)
1 Downloads (Pure)

Samenvatting

Non-contact capacitive electrodes are very suitable for wearable devices to acquire electrophysiological signals in an unobtrusive and long-term way. However, due to its poorly-defined and low electrode capacitance (Ce), its front-end amplifier requires a large biasing resistance (e.g., > 100 GΩ) to maintain a sub-Hz high-pass frequency and low circuit noise. This paper compares two amplifier structures, i.e., a voltage amplifier (VA) and a charge amplifier (CA), each with three biasing strategies, i.e., pseudo resistors, switched resistors and reset switches. These, in total six, amplifier designs were fabricated in a standard 180nm CMOS technology and compared in terms of their input impedance, transfer function and input-referred noise. As final result, the VA and CA structures have comparable performance. In terms of biasing network, the pseudo resistor can achieve hundreds of GΩ, the switched-resistor only reaches several GΩ due to parasitics, and the reset switch achieves a TΩ resistance when it is shut off, and therefore results in the lowest high-pass frequency and the best noise performance.

Originele taal-2Engels
TitelICECS 2022 - 29th IEEE International Conference on Electronics, Circuits and Systems, Proceedings
UitgeverijInstitute of Electrical and Electronics Engineers
Pagina's1-4
Aantal pagina's4
ISBN van elektronische versie978-1-6654-8823-5
DOI's
StatusGepubliceerd - 2022
Evenement29th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2022 - Glasgow, Verenigd Koninkrijk
Duur: 24 okt. 202226 okt. 2022

Congres

Congres29th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2022
Land/RegioVerenigd Koninkrijk
StadGlasgow
Periode24/10/2226/10/22

Bibliografische nota

Funding Information:
ACKNOWLEDGMENT This work with project number 14663 is financed by the Dutch Research Council (NWO). We also kindly acknowledge EUROPRACTICE for its MPW and design tool support.

Financiering

ACKNOWLEDGMENT This work with project number 14663 is financed by the Dutch Research Council (NWO). We also kindly acknowledge EUROPRACTICE for its MPW and design tool support.

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