Inductance variable device
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United States of America Patent
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-
Mar 25, 2008
Grant Date -
Aug 2, 2007
app pub date -
Mar 26, 2007
filing date -
Oct 19, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A inductance variable device includes a first inductor, a second inductor magnetically coupled to the first inductor, a current source whose current is variable, electrically connected to the first inductor, and a current control unit. The current control unit controls a current flowing from the current source to the first inductor according to a feedback signal having frequency information in a current flowing in the second inductor to vary a combined inductance of the second inductor.
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