Low Phase Noise LC VCO

摘要

This paper presents a low phase noise LC VCO applied in PLL．Through inductor optimization，the circuit has a low phase noise and a wide tuning range with NMOS varactor.Simulation results with CSMCO．5μm CMOS process show that the tuning rang is 2．02GHz～2．5GHz and the phase noise is-175dBc/Hz at 500MHz offset with a 3．3V power supply．