Image sensor driving circuit

Details Image sensor driving circuit Image sensor driving circuit

1987-08-18

1988-06-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, 330107, 330260, 330261, H03F 136

Patent

active

047498528

ABSTRACT:
An image sensor driving circuit of the matrix driving type includes a plurality of sensor elements for converting light image information into an electrical image signal, an operational amplifier circuit section for amplifying the electrical image signal and a logic circuit section for controlling the operation of the amplifier circuit section. In one embodiment, the amplifier circuit section includes a single stage operational amplifier having a pair of series-connected feed-back resistors and a trimmer capacitor connected between the interconnection between the feed-back resistors and ground, which allows to eliminate the differential signal component arising from the parasitic capacitance of the sensor element. In another embodiment, the operational amplifier is provided with an input offset compensation circuit which supplies a compensation voltage opposite in polarity to the input offset voltage of the operational amplifier, thereby preventing crosstalk from occurring. In a further embodiment, the image sensor includes an analog circuit section having an operational amplifier circuit and a logic circuit section which are mounted on separate substrates.

REFERENCES:
patent: 4227155 (1980-10-01), Lerma
patent: 4354162 (1982-10-01), Wright
patent: 4464630 (1984-08-01), Eddins
patent: 4470020 (1984-09-01), Mohr

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