Telephonic communications – Subscriber line or transmission line interface
Patent
1994-07-27
1997-03-18
Brown, Thomas W.
Telephonic communications
Subscriber line or transmission line interface
379413, 379398, H04M 1900
Patent
active
056129980
ABSTRACT:
An integrated telephone interface circuit for driving a telephone line includes a line current sensor and a phase converter, both associated with an output stage connected to the telephone line. The circuit is equipped with a protection device against the generation of spurious signals including a comparator connected between the converter and the output stage, a control and monitoring circuit linked operatively to an output of the comparator, and a plurality of switches associated with the input side of the converter, as well as with the current sensor and the output stage. The switches are linked operatively to respective outputs of the control and monitoring circuit to reverse polarity of the line supply upon a predetermined threshold value for the comparator being exceeded.
REFERENCES:
patent: 4614840 (1986-09-01), Bienstman et al.
patent: 4800589 (1989-01-01), Siligoni et al.
Davis, P.C. and Crigler, F.W. "A Hybrid Integrated Trunk and Subscriber Line Interface," IEEE International Solid-State Circuits Conference (1982): 204-105.
Danneels, J.M. Van Den Bossche, L., Bienstman, L.A. "Monolithic 70 V Bipolar Linedriver IC for PCM SLI," IEEE Journal of Solid-State Circuits SC-18(3): 316-324, 1983.
Brown Thomas W.
Carlson David V.
Saint-Surin Jacques M.
SGS-Thomson Microelectronics S.R.L.
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