Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-08-11
2000-10-24
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214AG, 330 59, H01J 4014
Patent
active
061371017
ABSTRACT:
A light receiving amplifying device includes a light receiving device for outputting a light signal current which varies with a quantity of received light, a load resistor connected with the light receiving device in series, for generating a detected voltage which varies with the light signal current, and a low frequency current bypass circuit for preventing the detected voltage from being saturated when the detected voltage has a frequency in a low frequency band. The low frequency current bypass circuit is connected with the load resistor in parallel and has an input impedance varying with a frequency of the detected voltage. The device further includes a transimpedance amplifying circuit (inverting amplifying circuit) for transforming an impedance of the detected voltage, and a capacitor for coupling the low frequency current bypass circuit and the transimpedance amplifying circuit (inverting amplifying circuit). This makes it possible, with a relatively simple circuit and arrangement in an infrared communication receiver, to lower noises of the light receiving amplifying device while maintaining an operational range with respect to a DC photoelectric current.
REFERENCES:
patent: 5008524 (1991-04-01), Reutter et al.
patent: 5198658 (1993-03-01), Rydin
patent: 5600128 (1997-02-01), Lindstrom
patent: 5714909 (1998-02-01), Jackson
patent: 5734300 (1998-03-01), Yoder
patent: 5786730 (1998-07-01), Hadley
Okuda Takanori
Shimizu Takayuki
Yokogawa Naruichi
Le Que T.
Luu Thanh X.
Sharp Kabushiki Kaisha
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