Noise cancelling image sensor

Details Noise cancelling image sensor Noise cancelling image sensor

1986-06-10

1988-01-12

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821326, H04N 314

Patent

active

047195126

ABSTRACT:
A solid-state image sensor has an electrically floating carrier detecting electrode formed on a substrate, into which the signal carriers are transmitted, a sense amplifier circuit detecting the variation in a voltage of the electrode at the time of transferring the carriers, and a resetting electrode for resetting the potential of the electrode to a predetermined potential at every read-out period of the picture element section. A circuit arrangement for removing noise is provided with two switches which alternately become conductive in response to control pulse signals. The first switch becomes conductive during a first period within one picture element period. During the first period the CCD output signal contains an effective image signal component. The second switch becomes conductive during a second period during which the CCD output signal contains a reset noise component, thereby forcibly fixing the level of the reset noise signal to a DC reference potential so that reset noise can be removed.

REFERENCES:
patent: 4335406 (1982-06-01), Ohba et al.
patent: 4413284 (1983-11-01), Izumita et al.
patent: 4499497 (1985-02-01), Levine
patent: 4549215 (1985-10-01), Levine
patent: 4556851 (1985-12-01), Levine
patent: 4562475 (1985-12-01), Levine
patent: 4567525 (1986-01-01), Endo et al.
patent: 4608608 (1986-08-01), Nishizawa et al.

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