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 AG for each differential pixel.
|Original language||English (US)|
|IPC||H01L 27/ 00 A I|
|State||Published - Aug 17 2006|