A 1.88-NEF 3-kHz Current-Reuse Common-Gate Amplifier Featuring Resistorless High-Pass Filtering

Favresse, Sylvain;Bol, David;Flandre, Denis
(2024) IEEE International Conference on Electronics, Circuits and Systems (ICECS) — Location: Nancy, France (18.November.2024)

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Vagus nerve electroneurogram (VENG) signals have recently emerged as markers for the detection of epileptic seizures. However, these signals present a low amplitude and a large bandwidth, making them sensitive to the intrinsic noise of acquisition circuits and to interference from nearby muscles, which must be filtered out before amplification. To properly retrieve the useful signals, both the input filter and the instrumentation amplifier of the acquisition chain require an optimal noise-current trade-off. To tackle these issues, this work presents a common-gate current-reuse amplifier featuring resistorless high-pass filtering, prototyped on a 22-nm fully depleted silicon-on-insulator chip. The measured amplifier consumes 2.38 µA with a 1.7 µVRMS input-referred noise, resulting in a noise efficiency factor (NEF) of 1.88 with a bandwidth from 300 Hz to 3 kHz.
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Favresse, S., Bol, D., & Flandre, D. (2024). A 1.88-NEF 3-kHz Current-Reuse Common-Gate Amplifier Featuring Resistorless High-Pass Filtering. Proceedings of the 2024 31st IEEE International Conference on Electronics, Circuits and Systems (ICECS). Published. IEEE International Conference on Electronics, Circuits and Systems (ICECS), Nancy, France. https://doi.org/10.1109/ICECS61496.2024.10848910 (Original work published 2024)