A 17 GHz COLPITTS VCO USING REVERSE- AND FORWARD-BIASED DIODE TUNING IN 0.18 μM CMOS

摘要

A 17 GHz complementary Colpitts voltage-controlled oscillator (VCO) is designed and implemented in a 0.18μm CMOS 1P6M process. The drain-body diode of MOSFET is used as the varactor. The VCO consists of two single-ended complementary Colpitts LC-tank VCOs coupled by a pair of capacitors. At the supply voltage of 1.2 V, the output phase noise of the VCO is -108.54 dBc/Hz at 1 MHz offset frequency from the carrier frequency of 17.3 GHz, and the figure of merit is -189.51 dBc/Hz. Total VCO core power consumption is 2.4 mW. Tuning range is about 1 GHz, from 17.4 to 16.4 GHz, whereas the control voltage was tuned from 0 to 0.9 V.