| 摘要 |
Tank circuits that can support multiple frequency bands and have good RF performance. The tank circuit can be used for oscillators, filters, and other applications. The tank circuit includes the elements normally associated with the particular application. For example, the tank circuit for an oscillator typically includes one or more of varactor (320a, 320b), capacitor (324a, 324b), inductor (326a, 326b), and biasing and filtering elements. The tank circuit further includes an additional reactive element (336a, 336b) coupled via switching means to either the capacitor or inductor. The additional reactive element (336a, 336b) and switching means (342, 334a, 334b) are selected to provide the desired circuit characteristics and good RF performance. In a specific implementation, an additional inductor (336a) is coupled, via a pin diode (334a), in parallel with the other inductor (326a). |
