Electronic subscriber line interface circuit having means to equ

Details Electronic subscriber line interface circuit having means to equ Electronic subscriber line interface circuit having means to equ

1981-03-30

1983-11-08

Schreyer, Stafford D.

Electricity: power supply or regulation systems

Remote sensing

179 70, 179 18FA, 323315, H04M 1900

Patent

active

044144342

ABSTRACT:
In this subscriber line interface circuit which comprises a pair of amplifiers whose outputs are connected to the subscriber's line, the input terminals of these amplifiers receive by means of negative feedback voltages having 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. The two load impedances, which are connected between the supply terminals of the amplifiers and the terminals of a d.c. voltage supply source are controlled 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 voltage V.sub.z. Consequently, the amplifiers of the line interface circuit operate completely independent of the longitudinal currents.

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