A voltage controlled oscillator (VCO) is designed and implemented at 850 MHz with Colpitts oscillator using a dielectric resonator as a equivalent inductor on account of its high quality factor Q and small size. A varactor diode is used as a variable reactance, which determines a controlled frequency band of the VCO with its series capacitor. This VCO has the flat frequency response of 20 MHz with a slope of 1.27 MHz/V to D.C. control voltage, and 5.53 dBm output power.
