Image sensing device having on-chip fixed-pattern noise reducing

Details Image sensing device having on-chip fixed-pattern noise reducing Image sensing device having on-chip fixed-pattern noise reducing

1984-01-05

1985-12-03

Brown, Thomas W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, 358167, 358211, H04N 315

Patent

active

045569100

ABSTRACT:
An image sensing device having an on-chip output signal extracting circuit employing low gain-bandwidth product amplifiers and a simple circuit design. The output signal from scanning a photosensor element array is applied to the inverting input of an operational amplifier, the noninverting input of which receives a reference potential. A feedback capacitor is connected between the output and inverting input of the operational amplifier, and a resetting FET is connected in parallel with the feedback capacitor. An inverted replica of switching transients which occur on the inverting input terminal of the amplifier is fed to that terminal via a second capacitor. The output of the operational amplifier is buffered and applied to the output terminal of the sensor chip.

REFERENCES:
patent: 4011442 (1977-03-01), Engeler
patent: 4335406 (1982-06-01), Ohba et al.

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