Inductive tuned voltage controlled oscillator for V-band

A highly efficient differential cross coupled voltage controlled oscillator (VCO) with transformer tuning is presented here for V band (60 GHz) application. Here Tuning is done by on chip octagonal transformer which is used as inductive element in LC tank. This transformer tuning scheme gives three bands of frequency to cover 7 GHz bandwidth of 60 GHz unlicensed band and gives low phase noise as compared to inductor based oscillator design. In this method 60 GHz VCO is implemented in UMC 65nm 1P10M CMOS Technology which gives FTR (frequency tuning range) from 55 GHz to 62.4 GHz with phase noise variation -114.5 to -116.5dBc/Hz at 10 MHz offset.