Line feed circuit including negative impedance circuit

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

H - Electricity

04

M

379/66

H04M 7/00 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1190682

LINE FEED CIRCUIT INCLUDING NEGATIVE IMPEDANCE CIRCUIT Abstract of the Disclosure 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 communcation 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. -i-

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