Gain control system for visible light communication systems

Details Gain control system for visible light communication systems Gain control system for visible light communication systems

2007-03-22

2009-10-13

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LS, C330S308000

Reexamination Certificate

active

07601940

ABSTRACT:
An optical receiver having a photodetector, a variable gain amplifier, and a gain control circuit is disclosed. The photodetector generates a photodetector output signal related to an intensity of light received by the photodetector, the photodetector output signal being characterized by a peak-to-peak signal value. The variable gain amplifier amplifies the photodetector output signal to generate a receiver output signal that is coupled to an external device, the variable gain amplifier having a gain that is determined by a gain control signal. The gain control circuit receives the receiver output signal and generates the gain control signal therefrom. The gain control signal causes the gain of the variable gain amplifier to decrease as a function of the peak-to-peak signal value to reduce changes in the output signal amplitude as a function of the input light signal amplitude.

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