H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/56, 379/63
H04M 1/76 (2006.01) H04M 19/00 (2006.01)
Patent
CA 1155244
ABSTRACT OF THE DISCLOSURE Circuit apparatus for supplying a regulated loop current to a two conductor loop telephone line includes first and second line feed resistan- ces, each having one terminal connected to a respective terminal of the telephone line. A differential amplifier has one input connected to the first resistance and a second input connected to the second resistance in common with the resistance connections to the telephone line terminals. One of the resistances has its other terminal connected to the output of an active circuit means, which circuit operates in a feedback path to supply the desired loop current to the line resistances and therefore the tele- phone line. The input control signal for the active feedback circuit is derived from summing the output signal from the differential amplifier with a reference signal whose magnitude varies according to the length of the telephone line. The Feedback path is supplied by the connection between the output of the active feedback circuit and the line resistance as further coupled to an input of the differential amplifier.
365618
International Standard Electric Corporation
Smart & Biggar
LandOfFree
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