Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-01-07
1994-03-22
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
348246, H01J 4014
Patent
active
052966968
ABSTRACT:
A solid state image pickup apparatus comprises pixels each of which is composed of a photoelectric transducer element having a function of amplification, and further comprises FPN suppression circuits basic cells provided for the pixel, wherein the FPN suppression circuit comprises an inverting amplifier; an input capacitor connected between the output of the pixel and the input of the inverting amplifier; a n-MOS transistor for supplying an initial voltage to the input of the inverting amplifier; a feedback capacitor one terminal of which is connected to the input of the inverting amplifier; a n-MOS transistor connected between the other terminal of the feedback capacitor and the output of the inverting amplifier; and a n-MOS transistor connected between the node connecting the above two elements and a reference voltage source. As an advantage of this configuration, it is possible to achieve a solid state image pickup apparatus in which the FPN, caused by offset difference among the pixels composed of photoelectric transducer elements having a function of amplification, is suppressed without increasing chip area, and in which it is possible to perform a non-destructive readout.
REFERENCES:
patent: 5043820 (1991-08-01), Wyles et al.
patent: 5144133 (1992-09-01), Dudley et al.
patent: 5155348 (1992-10-01), Ballingal et al.
patent: 5182446 (1993-01-01), Tew
patent: 5204519 (1993-04-01), Nishihara et al.
Messinger Michael
Olympus Optical Co,. Ltd.
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