A V-Band Push-Push VCO With Wide Tuning Range Using $0.18~\mu{\rm m}$ CMOS Process

A V-band push-push voltage-controlled oscillator (VCO) with wide tuning range implemented in the 0.18 μm CMOS process technology is presented in this letter. The output signal with frequency twice that of the VCO core is extracted from the center tap of inductors rather than the one-quarter wavelength transmission line. The measured oscillating frequency of the VCO is from 67.18 to 74.84 GHz corresponding to a 10.79% tuning range. At the 74.84 GHz output frequency, the measured phase noises at 1 MHz and 10 MHz frequency offsets are -74.83 dBc/Hz and -102.53 dBc/Hz, respectively. The core circuit draws a 13.5 mA current from a 1.8 V power supply.