Analog in-memory subthreshold deep neural network accelerator

Low duty-cycle mobile systems can benefit from ultra-low power deep neural network (DNN) accelerators. Analog in-memory computational units are used to store synaptic weights in on-chip non-volatile arrays and perform current-based calculations. In-memory computation entirely eliminates off-chip weight accesses, parallelizes operation, and amortizes readout power costs by reusing currents. The proposed system achieves 900nW measured power, with an estimated energy efficiency of 0.012pJ/MAC in a 130nm SONOS process.