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US 2003/0068031 A1Published application
Ring boost circuit to extend ringing range of telephone SLICs
AssigneeThomson Licensing
InventorBrian Albert Wittman
Life of this patent
Estimating the term…
Abstract
A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage between the ring node and a tip node when the first switching device is activated during the ring operation.
Claims18
A ring boost circuit, comprising:
- a first switching device coupled to a ring node and being responsive to a ring operation;
- and
- a charge pump connected to the ring node, the charge pump providing a voltage offset to enhance a differential voltage between the ring node and a tip node when the first switching device is activated during the ring operation.
A ring boost circuit, comprising:
- a tip node and a ring node;
- a first switch coupled to the ring node and being responsive to a ring operation;
- a charge pump connected between the ring node and the first switch, the charge pump providing a voltage offset to enhance a differential voltage between the ring node and the tip node when the first switch device is closed to connect a ring output node to the charge pump during the ring operation;
- and
- a second switch, which connects the tip node to the charge pump during the ring operation.
2 more elements
A ring boost circuit, comprising:
- a current preventing device coupled to a tip node to decouple signals other than signals associated with a ring operation;
- and
- a charge pump connected to a ring node and the current preventing device, the charge pump providing a voltage offset to enhance a differential voltage between the ring node and the tip node when an activation current is received from the tip node during the ring operation.
Dependencies are inferred from the claim text.