A New Technique for the Design of Multi-Phase Voltage Controlled Oscillators

摘要

In this work, a novel circuit structure for second-harmonic multi-phase voltage controlled oscillator (MVCO) is presented. The proposed MVCO is composed of N (N being an integer number and N >= 2) identical inductor-capacitor (LC) tank VCOs. In theory, this MVCO can provide 2N diffrerent phase sinusoidal signals. A six-phase VCO based on the proposed structure is designed in a TSMC 0.18um CMOS process. Simulation results show that at the supply voltage of 0.8 V, the total power consumption of the six-phase VCO circuit is about 1 mW, the oscillation frequency is tunable from 2.3 GHz to 2.5 GHz when the control voltage varies from 0V to 0.8 V, and the phase noise is lower than -128 dBc/Hz at 1 MHz offset frequency. The proposed MVCO has lower phase noise, lower power consumption and more outputs than other related works in the literature.