Uran, ArdaLeblebici, YusufEmami, AzitaCevher, Volkan2021-01-132021-01-132021-01-132020-08-0410.1109/LSSC.2020.3013993https://infoscience.epfl.ch/handle/20.500.14299/174675This letter presents an energy-and-area-efficient ac-coupled front-end for the multichannel recording of wideband neural signals. The proposed unit conditions local held and action potentials using an inverter-based capacitively coupled low-noise amplifier, followed by a per-channel 10-b asynchronous SAR ADC. The adaptation of unit-length capacitors minimizes the ADC area and relaxes the amplifier gain so that small coupling capacitors can be integrated. The prototype in 65-nm CMOS achieves 4× smaller area and 3× higher energy-area efficiency compared to the state of the art with 164 μm×40 μm footprint and 0.78 mm 2 ×fJ/conv-step energy-area figure of merit. The measured 0.65-μW power consumption and 3.1-μVrms input-referred noise within 1 Hz-10 kHz bandwidth correspond to a noise efficiency factor of 0.97.text::journal::journal article::research article