Device for converting a photosignal into a voltage in image...

Details Device for converting a photosignal into a voltage in image... Device for converting a photosignal into a voltage in image...

2006-06-13

2006-06-13

Nguyen, Tu T. (Department: 2877)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

07060956

ABSTRACT:
An image sensor with matrix readout includes a matrix of elementary photodetectors (P) connected through at least a bus (Bpel) to a remote integrator (I) which converts the signal of each elementary photodetector into a voltage. Provided between the end of the bus and the input of the integrator is an impedance matching device (D) with low output capacitance, delivering at its output, during the time for converting photodetector signal, a variation of charge which corresponds to an affine function of the charge present at the input of said matching device, wherein this charge variation is determined by:∫t=0t=Tconv⁢Iinj⁢(t)·ⅆt=∫t=0t=Tconv⁢I⁢⁢int⁢(t)·ⅆtwhere Iinj is the instantaneous current of the bus, injected at the input of the impedance matching device, Iint is the instantaneous current at the input of the integrator and Tconv is the conversion time.

REFERENCES:
patent: 5742058 (1998-04-01), Pantigny et al.
patent: A 2 736 782 (1995-04-01), None
Patent Abstracts of Japan, “Image sensor signal read circuit”, Dec. 1987.
Patent Abstracts of Japan, “Image sensor signal read circuit”, Jul. 1987.

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