tunable varactor diode

例句：

1. 1.The tunable varactor diode is used in the design of high-frequency oscillators.
   可调变二极管用于高频振荡器的设计。
2. 2.In this circuit, the tunable varactor diode is used to control the current flowing through the resistor.
   在这个电路中，可调变二极管被用来控制流过电阻器的电流。
3. 3. The tunable varactor diode can be used to tune the frequency of a radio signal.
   可调变二极管可以用来调谐无线电信号的频率。