Low Power Low Phase Noise LC Quadrature VCO Topology (Electronic Circuits)

A simple low power low phase noise LC QVCO (Quadrature Voltage Controlled Oscillator) topology is proposed. The topology minimizes phase noise by eliminating the contributions from the tail current source and coupling transistors. With no more than 3.36 mW power consumption from a 1.2V power supply, the VCO achieves -124dBc/Hz phase noise performance at 1 MHz offset from the 2.85 GHz carrier frequency.