A flexible column parallel successive-approximation ADC for hybrid neuromorphic computing

This work presents a concept and components for a Nyquist dual mode charge-redistribution SAR ADC in a 65nmprocess. Its fast mode (62.5MSs $^{-1})$ offers 7bit resolution using an interleaving technique and its precise mode 8bit resolution at 12.5MSs $^{-1}$. The ADC is specialized on the requirements of a parallel interface between analog and digital computing blocks in the neuromorphic BrainScaleS-2 (BSS-2) system. Furthermore, it offers a small area footprint of around $1500 \mu m^{2}$ and low power consumption. It targets at two main applications: A fast result readout for analog vector-matrix-multiplications as well as membrane potentials and other plasticity related observable in spiking neural networks (SNNs).