Method and apparatus for phantom battery feed
AssigneeLegerity, Inc.
InventorRussell J. Apfel
Life of this patent
Estimating the term…
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.
Claims22
A method, comprising:
- driving a voltage signal onto a telecommunications line using a first amplifier and a second amplifier;
- and
- performing a phantom battery feed during a negative cycle of said voltage signal, performing said phantom battery feed comprising:
- supplying a negative supply terminal of said first amplifier with a supply voltage that is one-half of a full scale supply voltage;
- and
- supplying a positive supply terminal of said second amplifier with a supply voltage that is one-half of said full scale supply voltage.
An apparatus, comprising:
- a first amplifier comprising a positive supply terminal and a negative supply terminal;
- a first switch coupled with said negative supply terminal of said first amplifier, said switch being adapted to transition said negative supply terminal from a full scale voltage source to a half scale voltage source;
- a second amplifier comprising a positive supply terminal and a negative supply terminal and
- a second switch coupled with said positive supply terminal of said second amplifier, said switch being adapted to transition said positive supply terminal from a full scale voltage source to a half scale voltage source.
An apparatus, comprising:
- a subscriber line;
- and
- a line card electronically coupled with said subscriber line, said line card being capable to:
- drive a voltage signal onto said subscriber line using a first amplifier and a second amplifier;
- supply a negative supply terminal of said first amplifier with a supply voltage that is one-half of a full scale supply voltage;
- and
- supply a positive supply terminal of said second amplifier with a supply voltage that is one-half of said full scale supply voltage.
An apparatus, comprising:
- means for driving a voltage signal onto a telecommunications line using a first amplifier and a second amplifier;
- and
- means for performing a phantom battery feed during a negative cycle of said voltage signal, performing said phantom battery feed comprising:
- supplying a negative supply terminal of said first amplifier with a supply voltage that is one-half of a full scale supply voltage;
- and
- supplying a positive supply terminal of said second amplifier with a supply voltage that is one-half of said full scale supply voltage.
A computer readable program storage device encoded with instructions that, when executed by a computer, performs a method, comprising:
- driving a voltage signal onto a telecommunications line using a first amplifier and a second amplifier;
- and
- performing a phantom battery feed during a negative cycle of said voltage signal, performing said phantom battery feed comprising:
- supplying a negative supply terminal of said first amplifier with a supply voltage that is one-half of a full scale supply voltage;
- and
- supplying a positive supply terminal of said second amplifier with a supply voltage that is one-half of said full scale supply voltage.
Dependencies are inferred from the claim text.