High bandwidth information channel with optocoupling isolation

Details High bandwidth information channel with optocoupling isolation High bandwidth information channel with optocoupling isolation

1992-12-24

1994-01-11

Mullins, James B.

Amplifiers

Having light-controlled or activated device

250214A, 330308, H03F 1700

Patent

active

052785157

ABSTRACT:
An accurate direct current to 1 MHz (or more) analog information channel with 7.5 kV input to output isolation is provided using a commercially available opto-electronic isolator. The relatively slow response, (limited bandwidth) of the LED portion of the opto-electronic isolator is overcome by providing a frequency compensated negative feedback loop around the servo photodetector in the opto-electronic isolator. The feedback loop includes proper frequency compensation for the phase lag properties of both the LED and the servo photodetector, thus extending the bandwidth well beyond the 200 KHz typical of such opto-electronic isolators.

REFERENCES:
patent: 4536715 (1985-08-01), Basarath et al.

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