Subscriber line interface circuit with longitudinal current...

Details Subscriber line interface circuit with longitudinal current... Subscriber line interface circuit with longitudinal current...

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) H04M 3/00 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1233283

SUBSCRIBER LINE INTERFACE CIRCUIT WITH LONGITUDINAL CURRENT SUPPRESSION . Abstract of the Disclosure A SLIC includes controlled current circuits (CCCs) which simulate feed resistors for controlling d.c. feed to a two-wire telephone subscriber line which is coupled to two terminals, control being achieved via a feedback loop. A differential amplifier has an inverting input coupled to the tapping point of a potential divider connected between the terminals, and a non-inverting input connected to a reference potential of half of the supply battery voltage. For suppressing longitudinal currents on the line, the amplifier output is connected to each terminal via a d.c. blocking capacitor in series with a resistor, the resistors having closely matched resistances. For maintaining d.c. balance, the output of the amplifier is coupled via a low pass filter to control a current splitter included in the feedback loop, to control the relative proportions of control currents for the CCCs. -i-

490970

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