| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for achieving a variable inductance type resonance circuit and to provide a means for solving the improvement of sensitivity in an on-board broadcasting receiver and the improvement of interference wave removing capacity. SOLUTION: An LC resonance circuit variably changes the inductance of an inductive element by combining an amplifier and the inductive element and allowing the gain of the amplifier to electronically vary in a range less than +1. The LC resonance circuit is used as a tuning circuit capable of allowing a required frequency band to vary even when antenna capacity exists and as an oscillator in a local signal generator. COPYRIGHT: (C)2008,JPO&INPIT
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