| 摘要 |
A multiple band voltage controlled oscillator capable of generating multiple operating frequencies, and a method of generating multiple operating frequencies, includes a tank circuit having a diode element and an impedance element with a radio frequency impedance in parallel with the diode element, a PIN diode connected across a portion of the inductance of the impedance element which selectively shorts the portion of the inductance of the impedance element when activated, a switch connected to selectively enable the PIN diode and correspondingly partially short the inductance of the impedance element, thereby scaling the radio frequency impedance of the tank circuit, and an oscillator circuit responsively connected to the PIN diode for varying the output of the voltage controlled oscillator based on the radio-frequency impedance present. |
