Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-12-11
1993-10-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
359189, H01J 4014
Patent
active
052548511
ABSTRACT:
A wide-dynamic range light receiver according to the present invention is constructed such that a non-linear impedance element is connected in series to a light-receiving element, and a resistor and a capacitor are connected in series between a connection node of the light-receiving element and the non-linear impedance element and an input terminal of a low-noise amplifier. The impedance of the non-linear impedance element increases as the output of the light-receiving element approaches a minimum reception light level, and the non-linear impedance element is finally set in the non-conductive state. Thus, at the minimum reception light level, the output current of the light-receiving element is supplied, with little loss, to the low-noise amplifier via the pure resistor and the capacitor. In addition, the impedance of the non-linear impedance element decreases exponentially in accordance with the increase in the input of the light-receiving element. Consequently, the output current of the light-receiving element begins to flow into the non-linear impedance element from a certain point, and the current to the low-noise amplifier is limited.
REFERENCES:
patent: 4952795 (1990-08-01), Gauthier et al.
patent: 5023951 (1991-06-01), Kahn
patent: 5111324 (1992-05-01), Jahromi
Ibe Hiroyuki
Yamakawa Hideaki
Kabushiki Kaisha Toshiba
Nelms David C.
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