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-2 | Engels |
---|---|
Titel | ICECS 2022 - 29th IEEE International Conference on Electronics, Circuits and Systems, Proceedings |
Uitgeverij | Institute of Electrical and Electronics Engineers |
Pagina's | 1-4 |
Aantal pagina's | 4 |
ISBN van elektronische versie | 978-1-6654-8823-5 |
DOI's | |
Status | Gepubliceerd - 2022 |
Evenement | 29th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2022 - Glasgow, Verenigd Koninkrijk Duur: 24 okt. 2022 → 26 okt. 2022 |
Congres
Congres | 29th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2022 |
---|---|
Land/Regio | Verenigd Koninkrijk |
Stad | Glasgow |
Periode | 24/10/22 → 26/10/22 |
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.