Resistive battery feed for line circuits

Details Resistive battery feed for line circuits Resistive battery feed for line circuits

1976-02-09

1976-11-23

Robinson, Thomas A.

179 81R, H04B 152

Patent

active

039938808

ABSTRACT:
A line circuit, interconnecting a subscriber telephone line and a port circuit, includes shunt battery feed resistors of equal impedance together with resistors in series with the subscriber line and a further resistor connected to a point intermediate one battery feed resistor and the adjacent series line resistor. Each series line resistor has an impedance value equal to half the impedance value of the further resistor and forms a pad configuration that provides longitudinal balance and bilateral impedance matching. Stability declines, created by the bidirectional gain of an active hybrid used to overcome the insertion loss of the pad, are offset by stability improvements created through a reduced sensitivity to impedance variations in the subscriber line. Numerous other advantages result from the use of this pad configuration such as a reduction in size, weight and cost.

REFERENCES:
patent: 2694184 (1954-11-01), Rounds
patent: 3143715 (1964-08-01), Martens et al.
patent: 3284718 (1966-11-01), Becker
patent: 3288937 (1966-11-01), Donaldson
patent: 3309608 (1967-03-01), Alford
patent: 3497619 (1970-02-01), Babcock

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