Active mode line voltage regulator for ringing subscriber...

Details Active mode line voltage regulator for ringing subscriber... Active mode line voltage regulator for ringing subscriber...

2006-10-31

2006-10-31

Tran, Sinh (Department: 2615)

Telephonic communications

Subscriber line or transmission line interface

C379S322000

Reexamination Certificate

active

07130414

ABSTRACT:
A voltage regulator circuit arrangement limits the DC voltage applied to a tip and ring amplifiers of a subscriber line interface circuit (SLIC), each of which has a first polarity input coupled to a first current flow path to which a DC input (battery) voltage is coupled. A first current source supplies a first current derived via a low pass filter path from that flowing through the first current flow path to a second polarity input node of the tip amplifier, while a second current source supplies a similarly low pass filter path-derived second current to a second polarity input node of the ring amplifier. A voltage regulator is coupled with the first current flow path and is operative to regulate the voltage at the first polarity inputs of the tip and ring amplifiers to a regulated voltage value Vreg, so that the magnitudes of the first and second currents are based upon the regulated voltage value Vreg.

REFERENCES:
patent: 4631366 (1986-12-01), Takato et al.
patent: 4935960 (1990-06-01), Takato et al.
patent: 5160851 (1992-11-01), McAndrews

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