Image sensor having reduced fixed-noise output using flip flop c

Details Image sensor having reduced fixed-noise output using flip flop c Image sensor having reduced fixed-noise output using flip flop c

1987-04-29

1989-04-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821315, H04N 5335

Patent

active

048211044

ABSTRACT:
An image sensor having means for reducing fixed-pattern noise in its output signal. Real and dummy output lines are provided. First and second sets of transistors, driven by the horizontal shift register, couple, respectively, outputs of the sensor array and a floating line onto the real and dummy lines at read-out time. Because the fixed-pattern noise signal on the real and on the dummy lines is the same, the differential voltage between the two lines is entirely due to the actual signal. A flip-flop circuit is connected between the real and dummy lines to sense and amplify the differential voltage.

REFERENCES:
patent: 4045817 (1977-08-01), Nakatani et al.
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4500927 (1985-02-01), Ozawa
patent: 4511804 (1985-04-01), Ozawa
patent: 4746984 (1988-05-01), Matsumoto et al.

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