High-speed optocoupler driver

Details High-speed optocoupler driver High-speed optocoupler driver

1999-06-29

2002-02-12

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Signal isolator

C250S2140RC

Reexamination Certificate

active

06346711

ABSTRACT:

BACKGROUND OF THE INVENTION
To achieve speed in an optical coupler, the light source, such as a light emitting diode or LED, must be switched on and off rapidly. The driver described here provides rapid switching by generating several different, time-varying current components. The performance of the driver is enhanced by adding a pedestal current to the illuminating current for a period of time. Collectively, all of the applied currents help the LED to rapidly change from the “off” state to the “on” state and back again.


REFERENCES:
patent: 5061859 (1991-10-01), Lovelace et al.
patent: 5502298 (1996-03-01), Geller
patent: 5742133 (1998-04-01), Wilhelm et al.
patent: 0 441 965 (1991-08-01), None
patent: 0 470 780 (1992-02-01), None
patent: 0 542 480 (1993-05-01), None
patent: 0 704 993 (1996-04-01), None
patent: WO 99/01012 (1999-01-01), None

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