Monolithically integratable telephone circuit for feeding a subs

Details Monolithically integratable telephone circuit for feeding a subs Monolithically integratable telephone circuit for feeding a subs

1986-04-30

1989-06-20

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379324, H04M 1900

Patent

active

048415650

ABSTRACT:
A telephone circuit, which may be monolithically integrated, for feeding a subscriber's telephone line which is coupled via the circuit to a supply voltage generator. The circuit supplies the line with an impedance having a first predetermined value up to a given value of the line current, beyond which is supplies the line with an impedance of a second value greater than the first. The circuit is electrically equivalent to a voltage generator, identical to the supply voltage generator, having circuit components solely of the resistive type connected in series therewith.

REFERENCES:
patent: 4272656 (1981-06-01), Nishikawa
patent: 4358645 (1982-11-01), Brown
patent: 4476350 (1984-10-01), Aull et al.
patent: 4540852 (1985-09-01), Albouy et al.
patent: 4558272 (1985-12-01), Grosch
patent: 4661978 (1987-04-01), Hirata
patent: 4782507 (1988-11-01), Siligoni et al.
"Two-Slope Resistive Feeder for Telephone Line Interface Circuits", IBM Technical Disclosure Bulletin, vol. 25, No. 11A, Apr. 1983.

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