High speed AC/DC coupler

Details High speed AC/DC coupler High speed AC/DC coupler

1980-08-04

1982-10-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

043552374

ABSTRACT:
A high speed AC/DC coupler has an optical circuit for DC coupling and an AC coupler circuit, both receiving a digital input signal and both providing outputs resulting from the input signal to the same point of a clipper circuit. The response characteristic of the AC coupler circuit is faster than that of the optical coupler circuit and the output impedance of the optical coupler circuit is of such a magnitude to permit the output of the AC coupler to overdrive the output of the optical coupler. The time constant of the AC coupler circuit is set so that the signal from the AC coupler is impressed on the clipper circuit and remains impressed at least until the slower optical coupler output is also applied to the clipper circuit. The circuit provides a faithful reproduction of essentially any length input pulse, delayed a minimal time.

REFERENCES:
patent: 3995173 (1976-11-01), Sibley
patent: 4138635 (1979-02-01), Quinn
patent: 4282604 (1981-08-01), Jefferson
patent: 4292628 (1981-09-01), Sadler

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