Method and apparatus for phantom battery feed

Details Method and apparatus for phantom battery feed Method and apparatus for phantom battery feed

2005-10-18

2005-10-18

Harold, Jeffery F. (Department: 2644)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S395010, C379S399010

Reexamination Certificate

active

06956945

ABSTRACT:
A method and apparatus is for providing a phantom battery feed to reduce power consumption in a differential amplifier circuit. A voltage signal is driven onto a telecommunications line using a first amplifier and a second amplifier. A phantom battery feed is performed during a negative cycle of the voltage signal. Performing the phantom battery feed comprises: supplying a negative supply terminal of the first amplifier with a supply voltage that is one-half of a full scale supply voltage; and supplying a positive supply terminal of the second amplifier with a supply voltage that is one-half of the full scale supply voltage.

REFERENCES:
patent: 6233335 (2001-05-01), Ludeman

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