Ring boost circuit to extend ringing range of telephone SLICs

Details Ring boost circuit to extend ringing range of telephone SLICs Ring boost circuit to extend ringing range of telephone SLICs

2005-09-06

2005-09-06

Tieu, Binh (Department: 2643)

Telephonic communications

Subscriber line or transmission line interface

For line length compensation

C379S382000, C379S395010, C379S413000

Reexamination Certificate

active

06940970

ABSTRACT:
A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage between the ring node and a tip node when the first switching device is activated during the ring operation.

REFERENCES:
patent: 4578541 (1986-03-01), Dodds
patent: 5086454 (1992-02-01), Hirzel
patent: 5764755 (1998-06-01), Chen
patent: 6160884 (2000-12-01), Davis
patent: 6326852 (2001-12-01), Wakayama
patent: 6377667 (2002-04-01), Poulis et al.

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