Subscriber line interface circuit having an impedance...

Details Subscriber line interface circuit having an impedance... Subscriber line interface circuit having an impedance...

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) H03F 1/48 (2006.01) H04M 19/00 (2006.01)

Patent

CA 1224894

- 15 - "Subscriber Line Interface Circuit Having an Impedance Synthesizer" ABSTRACT A subscriber line interface circuit discribed wherein a pair of line terminals are connected to a subscriber loop and a pair of output terminals are connected to a telecommunication exchange. A first amplifier is provided having a first pair of input terminals coupled to the line terminals and a second pair of input terminals. The first amplifier has a unity gain over a path from the input terminals of the first pair to said output terminals and a gain K over a path from the terminals of the second pair to said output terminals. A pair of reference resistors are cross-coupled from said output terminals to the line terminals, each of the reference resistors having a resistance Ro. A second amplifier is connected from the line terminals to the terminals of the second pair, the second amplifier having a transfer function -Ro/K.Zt, where Zt is an impedance to be synthesized across the line terminals.

471008

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