Line feed circuit including negative impedance circuit

Details Line feed circuit including negative impedance circuit Line feed circuit including negative impedance circuit

1983-02-04

1985-07-30

Rubinson, Gene Z.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

179 77, 333216, 333217, H04B 316

Patent

active

045323844

ABSTRACT:
Communication lines for example telephone loop circuits are typically terminated with line feed circuits such that d.c. and a.c. terminating impedances are dissimilar. The line feed circuit includes tip and ring feed resistors of similar ohmic values for supplying the communication line with energizing current. An a.c. terminating impedance of greater ohmic value than the d.c. terminating resistance is provided by a negative impedance circuit which is a.c. coupled across the communication line, in shunt with the feed resistors.

REFERENCES:
patent: 3927280 (1975-12-01), Gupta et al.
patent: 3955052 (1976-05-01), Orbach
patent: 4135064 (1979-01-01), Lichtenstein
patent: 4197431 (1980-04-01), Vis
patent: 4350964 (1982-09-01), Chambers, Jr.

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