Imaging array having variable conversion gain

Details Imaging array having variable conversion gain Imaging array having variable conversion gain

2007-09-11

2007-09-11

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C348S300000, C330S308000

Reexamination Certificate

active

11175948

ABSTRACT:
A CCD imaging array and a charge measurement amplifier for use in such imaging arrays is disclosed. The array includes a plurality of pixels that accumulate charge when exposed to light, a readout amplifier having input and output ports. The readout amplifier has a variable gain that is set by a gain control signal. The readout amplifier also includes a reset path between the input and output ports, the path having an impedance controlled by a reset signal. A controller generates the gain control signal and the reset signal during a charge measurement cycle. Initially the gain is set to a first value after generating the reset signal. The gain is changed to a second value during the charge measurement cycle if the output signal exceeds a first threshold value. The readout amplifier can be constructed from an operational amplifier having a capacitive feedback loop.

REFERENCES:
patent: 5892540 (1999-04-01), Kozlowski et al.
patent: 6201573 (2001-03-01), Mizuno
patent: 6339363 (2002-01-01), Fowler
patent: 6459078 (2002-10-01), Fowler
patent: 6747264 (2004-06-01), Miida
patent: 2006/0033007 (2006-02-01), Terzioglu

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