Fiber optic guard crossing of circuits having analog and digital sections
US4847507A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Jan 19, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/7955
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.