Integrated interface circuit for driving a subscriber line

Details Integrated interface circuit for driving a subscriber line Integrated interface circuit for driving a subscriber line

1996-12-16

1998-01-06

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

379398, 379413, H04M 1900

Patent

active

057063435

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:
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patent: 4782507 (1988-11-01), Siligoni et al.
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patent: 5511118 (1996-04-01), Gores et al.
patent: 5612998 (1997-03-01), Saviotti
Davis, P.C. and Crigler, F.W. "A Hybrid Integrated Trunk and Subscriber Line Interface," IEEE International Solid-State Circuits Conference (1982): 204-205.
Danneels, J.M.; Van Den Bossche, L.; Bienstman, L.A. "Monolothic 70 V Bipolar Lindriver IC for PCM SLI," IEEE Journal of Solid-State Circuits SC-18(3):316-324, 1983.

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