Subscriber line interface circuit with impedance synthesizer

Details Subscriber line interface circuit with impedance synthesizer Subscriber line interface circuit with impedance synthesizer

H - Electricity

04

M

379/67

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

Patent

CA 1173578

Abstract of the Disclosure A subscriber line interface circuit is described wherein the transverse and longitudinal termination impedances may be independently controlled; and wherein the equivalent termination impedance of a subscriber line/trunk as appears to the central office can be adjusted upward or downward from a lower resistance value, with longitudinal balance (also known as the common mode rejection) being determined by the matching of feed resistors. The foregoing interface circuit is implementable as a monolithic integrated circuit having low power dissipation, improved power bandwidth requirements, and lower voltage breakdown requirements for integrated circuits; all resulting in an improved telephone line interface circuit. Voltage feedback or current feedback may be employed in a circuit to synthesize the proper ac transverse termination impedance from a known dc resistance, for example, from the feed line resistors in a telephone line circuit.

384448

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