Electronic subscriber line interface circuit

Details Electronic subscriber line interface circuit Electronic subscriber line interface circuit

H - Electricity

04

M

379/67

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

Patent

CA 1173577

PHF 80526 17 ABSTRACT: A subscriber line interface circuit for connect- ing subscriber's lines to telephone exchanges which com- prises a pair of amplifiers whose outputs are connected to the subscriber's line, the input terminals of these ampli- fiers receive by means of negative feedback voltages hav- ing opposite phases depending on the transversal current I produced by the line interface circuit and independent of the longitudinal currents I accidentally produced on the subscriber's line. Two load impedances which are con- nected between the supply terminals of the amplifiers and the terminals of a d.c. voltage supply source are con- trolled by means of their control terminals by voltages which have the same characteristics as the voltages applied to the input terminals of the amplifiers but which in addition have been shifted with a certain shift volt- age Vz. Consequently, the amplifiers of the line inter- face circuit operate completely independent of the longi- tudinal currents.

375714

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