Solid state imaging apparatus

Details Solid state imaging apparatus Solid state imaging apparatus

1988-03-25

1989-04-04

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821312, 35821331, 357 30, H04N 314, H01L 2714

Patent

active

048190713

ABSTRACT:
A solid state imaging apparatus includes an internal amplification type of light-receiving element which constitutes a picture element, a signal processing circuit incorporating a pre-amplifier for processing a video signal current of the light-receiving element constituting a picture element, an internal amplification type of reference light-receiving element which is shielded from light illumination, a feedback loop provided in the pre-amplifier for controlling the gate voltage of the reference light-receiving element such that a current having the same value as that of the video signal current of the light-receiving element constituting a picture element is caused to flow to the reference light-receiving element, and means for discharging the dark current charge accumulated in the reference light-receiving element in the period during which the video signal current from the light-receiving element constituting the picture element is suspended.
Therefore, the reference light-receiving element functions as a negative feedback element of the pre-amplifier, by means of which the gate voltage of the reference light-receiving element is varied such that a source current which is equivalent to that of the light-receiving element constituting a picture element is caused to flow therethrough under the same bias conditions as in the case of the light-receiving element constituting a picture element, enabling an output which is linear to the quantity of light which is received to be produced as the output of the pre-amplifier.

REFERENCES:
patent: 4363963 (1982-12-01), Ando
patent: 4407010 (1983-09-01), Baji et al.
patent: 4518863 (1985-05-01), Fukuoka et al.
patent: 4571624 (1986-02-01), Nishizawa et al.
patent: 4587562 (1986-05-01), Imai et al.
patent: 4678938 (1987-07-01), Nakamura
patent: 4728802 (1988-03-01), Baron

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