$\Delta \Sigma $ analog-to-digital converter (ADC) for direct digitization of neural signals, which addresses the stimulation artifact recovery time in voltage-controlled oscillator (VCO)-based quantizers with a fast-recovery, overrange-detecting phase quantizer. The ADC uses a pseudo-virtual ground feedforwarding (PVG FF) technique and a complementary input

${G} _{\text {m}}$

-C filter with per-pixel decimation. It supports four recording modes covering 2.5–20 kS/s through a power-efficient, bandwidth-scalable continuous time

$\Delta \Sigma $

modulator. Fabricated in a 180-nm CMOS process, this

$300\times 300~\mu $

m2 ADC achieves

$\gt 250\times $

faster (0.05–0.4 ms) stimulation artifact recovery time, enabling in-stimulation recording. Recording with artifact tolerance was demonstrated through an in vivo whisker barrel rat experiment.">

A 2.5–20 kS/s In-Pixel Direct Digitization ECoG Front End With Submillisecond Stimulation Artifact Recovery (original) (raw)

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