| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and a method for allowing a DC offset to be applied to very slight improvement expenses and achieving a low-cost SLIC for driving a telephone product. SOLUTION: The ring boost circuit has a first switching device connected to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node and supplies a voltage offset for enhancing the potential differential voltage between the ring node and the tip node, when the first switching device is activated during the ring operation.
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