Charge coupled device open circuit image detector

Details Charge coupled device open circuit image detector Charge coupled device open circuit image detector

1983-01-19

1984-10-23

Munson, Gene M.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

357 30, 307311, H01L 2978, H01L 2714, H01L 3100, H03K 342

Patent

active

044791399

ABSTRACT:
An open circuit photodiode includes a capacitor plate formed monolithically with a forward biased P-N junction diode. The capacitor plate, together with one side of the P-N junction, forms a capacitor which is charged by the photocurrent of the diode. The voltage across the capacitor controls the output current of a charge coupled device (CCD) register. The invention operates in an open circuit configuration so that no net current flows across the diode junction as long as the flux of incident radiation is constant. If the incident radiation flux changes, current flows across the diode junction so that the capacitor is charged (or discharged) to a new voltage level corresponding to the new radiation flux level. As a result, the open circuit voltage of the capacitor modulates as a function of the change in incident radiation flux. The non-linearity inherent in the open circuit voltage response of the diode to incident radiation flux compensates for the nonlinearity in the output current response of the CCD register so that the total response is linear.

REFERENCES:
patent: 3808435 (1974-04-01), Bate et al.
patent: 3944849 (1976-03-01), Tasch et al.
patent: 4143389 (1979-03-01), Koike et al.
patent: 4169273 (1979-09-01), Hendrickson
patent: 4197469 (1980-04-01), Cheung

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