METHOD AND SYSTEM TO ENHANCE DIFFERENTIAL DYNAMIC RANGE AND SIGNAL/NOISE IN CMOS RANGE FINDING SYSTEMS USING DIFFERENTIAL SENSORS

摘要

Dynamic range of a differential pixel is enhanced by injecting, synchronously or asynchronously, a fixed compensating offset (?V) into a differential signal capacitor whenever magnitude of the differential signal across the capacitor exceeds a predetermined value. The number (N) of ?V offsets made is counted. Effective differential signal capacitor voltage V(t) = Vo + N-?V, where Vo is capacitor voltage. Differential pixel signal/noise ratio is increased by dynamically maximizing operational amplifier gain ASUBG/SUB for each differential pixel.