Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2005-09-27
2005-09-27
Eng, George (Department: 2643)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S392010
Reexamination Certificate
active
06950514
ABSTRACT:
A voltage reference filter for a subscriber line interface circuit removes unwanted noise on a DC reference voltage sourced by a device, such as a codec, and employed by the subscriber line circuit as a differential mode voltage baseline. The DC reference voltage is coupled via a high pass filter to the sense amplifier. The filter blocks the DC component of the reference voltage and passes noise components to the sense amplifier. The reference port of an amplifier between the sense amplifier and a codec receives the same (noisy) reference voltage AC-coupled to the sense amplifier, and performs common mode rejection of noise components riding on the DC reference.
REFERENCES:
patent: 5528688 (1996-06-01), Schorr
patent: 6735302 (2004-05-01), Caine et al.
Enriquez Leonel E.
Youngblood Douglas L.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Eng George
Intersil America's Inc.
Jamal Alexander
LandOfFree
Voltage reference filter for subscriber line interface circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage reference filter for subscriber line interface circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage reference filter for subscriber line interface circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3392677