Journal
2022 20TH IEEE INTERREGIONAL NEWCAS CONFERENCE (NEWCAS)
Volume -, Issue -, Pages 55-59Publisher
IEEE
DOI: 10.1109/NEWCAS52662.2022.9842066
Keywords
Artifact Recovery; Pseudo-resistor
Funding
- BMBF grant MR:Implant
- DFG [EI 1078/1-1]
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This paper proposes a method for handling stimulation artifacts in neuromodulation systems. By combining blanking switches with a tuning mechanism on the pseudo-resistor based high-pass corner frequency of the frontend, the settling speed during artifact-recovery can be increased, allowing undisturbed recording to begin shortly after a stimulation event.
In neuromodulation systems, stimulation causes artifacts which are orders of magnitude larger than the recorded neural signal. Several recent publications have proposed recorder front-ends with high dynamic range to cope with stimulation artifacts, thereby avoiding blanking switches and the resulting recorder blind-time. However, this usually comes at the cost of limited first-stage amplification due to signal swing requirements, thus degrading the noise efficiency factor (NEF). In this paper, we propose to instead combine blanking switches with a tuning mechanism on the pseudo-resistor based high-pass corner frequency of the frontend. This allows to temporarily increase the settling speed during artifact-recovery, such that undisturbed recording can commence few tens of milli-seconds after e.g., a stimulation event. The artifact-recovery scheme is demonstrated using an integrated state-of-the-art neuromodulator, and in-vitro measurements are presented to validate its usability.
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