Noise reduction apparatus for hybrid image sensor

Details Noise reduction apparatus for hybrid image sensor Noise reduction apparatus for hybrid image sensor

1982-05-27

1985-04-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358167, 358213, H04N 530

Patent

active

045118043

ABSTRACT:
A document sensing device is herein disclosed whereby the signal-to-noise ratio inherent in a large-size image sensor is enhanced by a reduction in system noise. A plurality of photodetectors are connected to a plurality of storage MOSFETs. Two signal wires are connected to alternating groups of the MOSFETs. A shift register is provided which sequentially turns on the MOSFETs. The connections of the groups of MOSFETs and the sequential turn-on sequence are both preselected such that at the same time one group of MOSFETs is outputting a composite signal (information plus noise) on one signal wire, the immediately preceding group of MOSFETs is outputting a signal (noise only) on the other signal wire. Upon the combination of the signals in a differential amplifier, the noise signal is thus eliminated from the composite signal.

REFERENCES:
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4067046 (1978-01-01), Nakatani et al.
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4283742 (1981-08-01), Izumita et al.

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