Capacitor cancellation method and apparatus

Details Capacitor cancellation method and apparatus Capacitor cancellation method and apparatus

2005-09-06

2005-09-06

Tran, Sinh (Department: 2644)

Telephonic communications

Subscriber line or transmission line interface

C379S399020, C379S090010, C379S093050

Reexamination Certificate

active

06940969

ABSTRACT:
A capacitor cancellation method and apparatus for use in an interface circuit having a transformer blocking capacitor. The method includes sensing a voltage across the transformer blocking capacitor and generating a cancellation signal to compensate for the effect of the transformer blocking capacitor. The apparatus includes a sensor to sense a differential voltage across the transformer blocking capacitor to develop a capacitor signal and an amplifier to amplify the capacitor signal to obtain a cancellation signal.

REFERENCES:
patent: 3855431 (1974-12-01), Stewart
patent: 3867589 (1975-02-01), Junek
patent: 4823383 (1989-04-01), Cardot et al.
patent: 4899382 (1990-02-01), Gartner
patent: 6137880 (2000-10-01), Bella
patent: 6295343 (2001-09-01), Hjartarson et al.
patent: 6418221 (2002-07-01), Snow et al.
patent: 2002/0181367 (2002-12-01), Bolla et al.

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