Method and system to enhance differential dynamic range and...

Details Method and system to enhance differential dynamic range and... Method and system to enhance differential dynamic range and...

2008-01-22

2008-01-22

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C250S208100

Reexamination Certificate

active

07321111

ABSTRACT:
Dynamic range of a differential pixel is enhanced by injecting, synchronously or asynchronously, a compensating offset (ΔCOMP) into a differential signal capacitor whenever magnitude of the differential signal across the capacitor exceeds a predetermined value. Positive and negative magnitudes of ΔCOMPneed not be equal. The number (N) of ΔCOMPoffsets made is counted. Effective differential signal capacitor voltage V(t)=Vo±N·ΔCOMP, where Vo is capacitor voltage. In other embodiments magnitude of ΔCOMPin a sequence of compensations can differ, and the sum total of compensations in recorded. Differential pixel signal
oise ratio is increased by dynamically maximizing operational amplifier gain AGfor each differential pixel.

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