A 10.66-to-15.03 GHz Dual-Core Dual-Mode Series Resonance VCO Achieving 209 dBc/Hz FoMTA

This paper presents a dual-core dual-mode series-resonance (SR) CMOS voltage-control-oscillator (VCO). By integrating the multi-mode technique with the SR-VCO, this work achieves ultra-low phase noise while maintaining a wide frequency tuning range. A magnetic mode selection switch is implemented to better suppress mode ambiguity. Fabricated in a 65~nm CMOS process, the presented VCO achieves a 34% tuning range and a phase noise of -140~dBc/Hz at 10~MHz offset across the entire frequency range, with a corresponding FoMTA of 209~dBc/Hz.