Abstract
In this work, a novel circuit structure for second-harmonic multi-phase voltage controlled oscillator (MVCO) is presented. The proposed MVCO is composed of [Formula: see text] ([Formula: see text] being an integer number and [Formula: see text]2) identical inductor–capacitor ([Formula: see text]) tank VCOs. In theory, this MVCO can provide 2[Formula: see text] different phase sinusoidal signals. A six-phase VCO based on the proposed structure is designed in a TSMC 0.18[Formula: see text]um CMOS process. Simulation results show that at the supply voltage of 0.8[Formula: see text]V, the total power consumption of the six-phase VCO circuit is about 1[Formula: see text]mW, the oscillation frequency is tunable from 2.3[Formula: see text]GHz to 2.5[Formula: see text]GHz when the control voltage varies from 0[Formula: see text]V to 0.8[Formula: see text]V, and the phase noise is lower than [Formula: see text]128[Formula: see text]dBc/Hz at 1[Formula: see text]MHz offset frequency. The proposed MVCO has lower phase noise, lower power consumption and more outputs than other related works in the literature.
Highlights
Radio Frequency (RF) voltage controlled oscillators (VCO) play a fundamental role in modern communications, signal processing, measurement systems and other applications
According to the operation mechanism, multi-phase voltage controlled oscillator (MVCO) can be classified into two categories: one category couples VCOs by injecting the fundamental frequency or firstharmonic signals from one LC tank to another [12], and the other category injects the second harmonic signals instead of the fundamental signals from the common node of each core oscillator to that of another
The results show that the proposed MVCO has a good overall performance in terms of supply voltage, power consumption, phase noise, and the number of multi-phase output
Summary
A novel circuit structure for second-harmonic multi-phase voltage controlled oscillator (MVCO) is presented. 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 0.8V, the total power consumption of the six-phase VCO circuit is about 1mW, the oscillation frequency is tunable from 2.3GHz to 2.5GHz when the control voltage varies from 0V to 0.8V, and the phase noise is lower than -128dBc/Hz at 1MHz offset frequency. The proposed MVCO has lower phase noise, lower power consumption and more outputs than other related works in the literature.
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