Communication apparatus
US4633217A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1985 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | May 22, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C19/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication apparatus for receiving both power and a sensor signal over the same transmission line having a first variable impedance element and a receiving impedance element connected in series across the transmission line, a second variable impedance element and a series impedance element connected in series across the transmission line, and a control circuit for controlling the first variable impedance element to maintain the transmission line voltage constant and for controlling the second variable impedance element to maintain the current flowing through the series impedance element constant, the control circuit simultaneously controlling the first and second variable impedance elements to maintain the current flowing through the series impedance element constant while transmitting data over the transmission line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.