Tip-ring voltage correction circuit

Details Tip-ring voltage correction circuit Tip-ring voltage correction circuit

1992-07-30

1994-08-09

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379377, 379413, H04M 300

Patent

active

053373545

ABSTRACT:
A correction circuit for use with a subscriber line interface circuit (SLIC) to control the level of a DC voltage supplied to the tip and ring wires of a telephone circuit includes a current sink with a differential operational amplifier. The amplifier output terminal is connected through an output resistor to a control input of the SLIC which influences the DC voltage level. The non-inverting input terminal of the amplifier is connected to the tip or ring wire, or both, and the inverting input terminal is connected to the output resistor and a DC reference circuit. The level of the voltage supplied by the SLIC is a function of the current supplied by the correction circuit.

REFERENCES:
patent: 4300023 (1981-11-01), Kelley et al.
patent: 4315106 (1982-02-01), Chea, Jr.
patent: 4406929 (1983-09-01), Pace et al.
patent: 4431874 (1984-02-01), Zobel et al.
patent: 4472608 (1984-09-01), Beirne
patent: 4532381 (1985-07-01), Rosenbaum et al.
patent: 4661978 (1987-04-01), Hirata
patent: 4803721 (1989-02-01), Schingh
patent: 5172409 (1992-12-01), Susak

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