Method and apparatus for processing a pixel signal

Details Method and apparatus for processing a pixel signal Method and apparatus for processing a pixel signal

2011-04-05

2011-04-05

Selby, Gevell (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S374000

Reexamination Certificate

active

07920188

ABSTRACT:
An NchMOS transistor Q71on the input side of a current mirror70is made function as a voltage operating-point setting portion so that a pixel signal line potential (voltage of a horizontal signal line20) would be constantly stable nearly at the GND. Then, an amplification factor and linearity become good in an amplification transistor in the solid imaging device3.A current copier90is made function as a current sampling portion so as to receive a signal current IIN of the solid imaging device3through the current mirror70to carry out sampling of a pixel signal in a resetting period in the shape of current component as the pixel signal is. Calculating differential between a current component in a detecting period and an offset current, which is the current component in a resetting period in sampling, allows an offset component included in the pixel signal to be removed and only pure signal Isig to be picked up at an output terminal Iout, so that the FPN restraining function can be fulfilled.

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Nakamura et al, “On-Focal-Plane Signal Processing for Current-Mode Active Pixel Sensors”, IEEE Transactions on Electron Device, vol. 44, No. 10, Oct. 1997, pp. 1747-1758.

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