| 摘要 |
A frequency-switching oscillator which satisfies the conditions for oscillation, even when the switch width of the oscillation frequencies is great, without requiring a number of components to be increased. The impedance of a resonance system is set to satisfy the conditions for oscillation at two or more oscillation frequencies. A switching member is provided in the amplification system, and the oscillation frequencies are switched by changing the impedance of the amplification system. Since the resonance system does not require a switching member, loss is not caused by switching member in the resonance system, so the output level does not drop and the carrier-to-noise ratio does not deteriorate. Furthermore, without a switching member in the resonance system, the number of components can be reduced, making miniaturization and cost reduction possible. <IMAGE>
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