Infrared receiver with variable input resistance for optical com

Details Infrared receiver with variable input resistance for optical com Infrared receiver with variable input resistance for optical com

1995-04-20

1997-02-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 359194, 330 59, H01J 4014, G01N 2100

Patent

active

056001282

ABSTRACT:
A large dynamic range infrared receiver with a variable input resistance for use in optical communication systems is described. The variable resistance provides this infrared receiver with three ranges of sensitivity depending on the power of the optical signal incident on the receiver. At low optical power, the variable resistance is high, providing the infrared receiver with high sensitivity. For intermediate optical power the variable resistance is reduced, providing the infrared receiver with medium sensitivity. At high optical power levels, the variable resistance switches to a low value, reducing the infrared receiver's sensitivity and limiting the voltage across the variable resistance.

REFERENCES:
patent: 1692904 (1928-11-01), Potter
patent: 2145147 (1939-01-01), Wolferz
patent: 3218917 (1965-11-01), Foersterling et al.
patent: 3999060 (1976-12-01), Skagerlund
patent: 4673807 (1987-06-01), Kobayashi et al.
patent: 4798950 (1989-01-01), Hosoda et al.
patent: 5138149 (1992-08-01), Cadet et al.

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