Wideband CMOS 65nm Hybrid Voltage Controlled Oscillator for Multiband Transceiver

In this work, a hybrid VCO comprises of a ring oscillator and a LC tank architecture is proposed. The hybrid VCO only employs a small inductor, which can deliver a much higher phase noise than the ring oscillator and consume smaller space than conventional LC-VCO. The core circuit is supplied with voltage headroom VDD=1.0 V. The V
TUNE
is varied from 0 V to 2.5 V which provides the performance tuning for the designed VCO. In post-layout, the VCO achieved a frequency bandwidth operation from 0.85 GHz to 1.6 GHz. The output power of the VCO ranges from 2.75 dBm to 3.05 dBm across the tuning voltage of the varactor. At 1 MHz offset frequency, the phase noise achieved is -100.7 dBc/Hz while at 10 MHz offset frequency, the phase noise is -120.4 dBc/Hz. The DC power consumption of the VCO is 4.6 mW.