Ratiometric compensated optical isolation coupler

Details Ratiometric compensated optical isolation coupler Ratiometric compensated optical isolation coupler

1997-01-29

1999-09-07

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Signal isolator

327514, G02B 2700

Patent

active

059490853

ABSTRACT:
An improved opto-isolator circuit is disclosed. A fixed bias current is induced through a photoemitter of the opto-isolator. A fixed DC voltage is fixed across the sensor of the opto-isolator, whereby any unknown scaling factor in the opto-isolator is substantially eliminated. In a low frequency embodiment, a passive bridge is used while in a high frequency embodiment, an active bridge circuit is used.

REFERENCES:
patent: 4190747 (1980-02-01), Feiner et al.
patent: 4580293 (1986-04-01), Reichle
patent: 4709154 (1987-11-01), Rademaker et al.
patent: 4819241 (1989-04-01), Nagano
patent: 4952820 (1990-08-01), Frisch
patent: 5373384 (1994-12-01), Hebert

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