mm-Wave CMOS Colpitts VCO & Frequency divider for the 60GHz WPAN

A mm-wave CMOS Colpitts VCO and Frequency divider for the 60GHz WPAN fabricated with the 90nm TSMC Process is presented. The VCO is composed of a NMOS transistor-pair as a core circuit and 3 bit capacitor array for enhancement of the oscillation bandwidth. A mm-wave frequency divider is designed based on CML divider driven by colpitts´s high voltage swing. The proposed VCO can operate at 28~34GHz and the phase noise at 1MHz offset is -112dBc/Hz. The operating range of the suggested CML divider is 20~46GHz when the driving voltage amplitude is 400mV. The power consumption of the VCO & divider including all the buffers is 30mW. Comparing to previous works, the proposed VCO & divider have the widest bandwidth at mm-wave frequency.