A compatible low-noise multi-phase voltage-controlled-oscillator

A compatible low-noise multi-phase voltage controlled oscillator is demonstrated in this paper. A compatible current steers are used to reduce the gain of VCO. The cascade structure of inverter is used to suppress the intrinsic noise and power supply noise. By increasing the output resistance of current steers with the cascade structure, the supply noise is suppressed. A modified inverter delay stage is designed to reduce the intrinsic noise of VCO. The simulation results of VCO would achieve 108.6dBc/Hz@1MHz.