Opamp-Less Sub-μW/Channel Δ-Modulated Neural-ADC With Super-GΩ Input Impedance

The presented 16-channel $\Delta $ -modulated neural analog-to-digital converter (ADC) exhibits tolerance to input dc offsets of any value, up to the supply voltage. It employs a dynamic differential-difference comparator architecture with a super- $\text{G}\Omega $ input impedance ensuring negligible gate-leakage current and well-matched differential inputs resulting in more than 78 dB of rejec...