A Programmable Adaptive-Q BPF Circuit

Jennifer Hasler

doi:10.1109/TCSI.2023.3292151

A Programmable Adaptive-Q BPF Circuit

2023-10-01

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Jennifer Hasler *

DOI：10.1109/TCSI.2023.3292151

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This effort shows the design, measurement, and characterization of a BandPass Filter (BPF) with similar Q adaptation properties seen in the nonlinear dynamics of the basilar membrane in the mammalian cochlea. Starting from low-pass Hopf bifurcations using programmable on-chip Transconductance Amplifiers (TA), a BPF is demonstrated that enables Q adaptation from 25-30 to 1 in roughly 1000 change in amplitude, resulting in a near instantaneous gain adaptation and higher dynamic range. Where the dynamic range of typical BPF banks is limited to the SNR of the individual filter, the adaptive BPF through a Hopf bifurcation enables high dynamic range even with moderate SNR at a given signal level, demonstrated on a large-scale Field Programmable Analog Array (FPAA). This block becomes the basis for higher dynamic range BPFs.

Keywords:

Neuromorphics

field programmable analog arrays (FPAA)

A Programmable Adaptive-Q BPF Circuit

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