Power coupler for coupling power from a transmission line to a n

Details Power coupler for coupling power from a transmission line to a n Power coupler for coupling power from a transmission line to a n

1993-07-14

1995-06-13

Swarthout, Brent

Communications: electrical

Systems

Selsyn type

370 853, 370 28, 34031002, 34031003, 34031006, 34031007, 34082552, H04M 1104

Patent

active

054247101

ABSTRACT:
A node power isolator for connecting a node of a two conductor transmission line network such as a twisted pair line to the network so as to enable the DC powering of the node from the network itself without significantly diminishing the signal levels on the network or interfering with the node's ability to receive signals from or transmit signals on the network. Current flow through the power isolator is through a transistor coupled in series with each transmission line to node connection, with the base to emitter voltage of the transistor clamped to be substantially constant at the signaling frequencies of interest, either directly by a capacitor connected there across, another circuit having a capacitor connected between the base and the emitter of another transistor or both. Various embodiments are disclosed.

REFERENCES:
patent: 3983323 (1976-09-01), Griffith et al.
patent: 4918690 (1990-04-01), Markkula, Jr. et al.
patent: 5148144 (1992-09-01), Sutterlin et al.
patent: 5257006 (1993-10-01), Graham et al.

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