Electronic circuit for receiving and discriminating modulated li

Details Electronic circuit for receiving and discriminating modulated li Electronic circuit for receiving and discriminating modulated li

1998-10-29

2000-12-26

Vu, Huy D.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359194, 250214A, 250214R, 250214SW, H04B 1006

Patent

active

061668400

ABSTRACT:
An electronic circuit (50) for receiving and discriminating modulated light of a specific modulation frequency or within a specific modulation frequency range includes a photodiode detector (52) responsive to light incident thereto for generating an electric current signal. A controllable shunt (54) is connected in parallel with the photodiode detector (52) and is controllable between a first operational mode in which the current is shunted, and a second operational mode in which the current is not shunted. A control circuit (56) is connected to the photodiode detector (52) and the shunt (54) for controlling the controllable shunt (54) into (a) the first operational mode, provided that the current signal does not include a signal of the specific modulation frequency or within the specific modulation frequency range, or (b) the second operational mode, provided that the current signal includes a signal of the specific modulation frequency or within the specific modulation frequency range.

REFERENCES:
patent: 4623786 (1986-11-01), Rodwell
patent: 4650986 (1987-03-01), Maile
patent: 4679251 (1987-07-01), Chown
patent: 5734300 (1998-03-01), Yoder
patent: 5889605 (1999-03-01), Claverie et al.
patent: 5949567 (1999-09-01), Jebens
patent: 6084232 (2000-07-01), Kimura

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