Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1988-01-19
1989-07-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
250227, 455602, G02B 2700
Patent
active
048475076
ABSTRACT:
For circuitry having analog and digital circuit sections and a signal flow path therebetween, a guard crossing for establishing electrical isolation and virtually no capacitive coupling between the two sections comprises optical fiber cables extending between circuit boards or between partitioned regions of a common circuit board carrying the analog and digital section for interfacing signals therebetween. Electrooptical transmitters and receivers in each section are coupled to the optical fiber cables. In accordance with one embodiment, bit serial signals are transmitted between the analog and digital sections through a single optical fiber cable for each direction. In another embodiment, a plurality of optical fiber cables for each direction carry the parallel bits of bit parallel signals between the two sections.
REFERENCES:
patent: 4008390 (1977-02-01), Runge
patent: 4176401 (1979-11-01), Lonberger
patent: 4622586 (1986-11-01), Megeid
patent: 4678946 (1987-07-01), Nagano
patent: 4703471 (1987-10-01), Fitelson et al.
patent: 4756025 (1988-07-01), Munz et al.
Carpenter William A.
Matson Don P.
Becker Stephen A.
Ishimaru Mikio
John Fluke Mfg. Co. Inc.
Nelms David C.
Oen William L.
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