Automatic power control circuit

Details Automatic power control circuit Automatic power control circuit

1995-12-15

1998-03-03

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

372 29, 372 38, H04B 1004

Patent

active

057241708

ABSTRACT:
A control circuit of a light-emitting device comprises a negative-feedback loop including a photodetector and a sample and hold circuit. The photodetector monitors an optical signal emitted by the light-emitting device and the sample and hold circuit generates a control signal supplied to a light-emitting device driver. The sample and hold circuit performs the sampling of a monitored signal each time the light-emitting device emits light and holds the sampled monitored signal. The voltage held in the sample and hold circuit is output as the control signal the light-emitting device driver. The light-emitting device driver drives the light-emitting device to switch on and off according to the input digital data with the output light intensity of the light-emitting device controlled by the control signal so as to be kept at a constant level.

REFERENCES:
patent: 4611352 (1986-09-01), Fujuto et al.
patent: 4768198 (1988-08-01), Deki
patent: 5146464 (1992-09-01), Uemura
Ueno et al., Technical draft of Conference, B-984, P4-122, of The Institute of Electronics, Information and Communication Engineers, Spring 1993.

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