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...

2007-01-02

2007-01-02

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC

Reexamination Certificate

active

11350209

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

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