Circuit for reducing voltage peak in interfacing with a...

Details Circuit for reducing voltage peak in interfacing with a... Circuit for reducing voltage peak in interfacing with a...

2006-02-28

2006-02-28

Tran, Sinh (Department: 2646)

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

C379S362000, C379S395010

Reexamination Certificate

active

07006623

ABSTRACT:
According to an embodiment, a DC driver circuit is coupled to a tip/ring line. The DC driver circuit includes a first capacitor coupled to a first switch where the first switch is coupled to an amplification circuit. An RC circuit is coupled to a second switch where the second switch is coupled to the amplification circuit. During a make state, the first and second switches are closed, causing the amplification circuit to draw current from the tip/ring line. During a break state, the first and second switches are open, preventing the amplification circuit from drawing current from the tip/ring line. The transition from the make state, during which a significant amount of current is drawn from the tip/ring line, to the break state, during which no current should be drawn from the tip/ring line, occurs at a rate that results in a significantly reduced voltage peak at the tip/ring line.

REFERENCES:
patent: 3968333 (1976-07-01), Simokat et al.
patent: 5121425 (1992-06-01), Reichelt
patent: 5425096 (1995-06-01), Okada
patent: 5500895 (1996-03-01), Yurgelites
patent: 6621904 (2003-09-01), Fischer et al.

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