Design Of CMOS Millimeter-wave Voltage-Controlled Oscillator

With the rapid development of wireless communication technology,especially the continuous advancement in the 5G plan.the bandwidth requirements of wireless communication system are getting higher and higher,which makes millimeter-wave band(30GHz ~ 300GHz)attracts more and more attention..RF transceiver system is an integral part of wireless communication systems,its research has been the main content of the millimeter-wave band or even the terahertz frequency band.Voltage-controlled oscillator(VCO)is one of the most important modules in the RF transceiver system,and has received more and more attention.This paper describes the importance of studying CMOS millimeter-wave voltage-controlled oscillator,introduces the domestic and foreign research progress on the voltage-controlled oscillator of CMOS millimeter-wave frequency band,and analyzes the design theory and realization method of VCO,higher performance requirements for VCOs.Based on the CMOS technology,the millimeter-wave VCO is designed.The main research works are as follows:1.The design of low phase noise VCO is designed.In the simulation environment of ADS,the inductance is designed by using the resonant ring structure,and the VCO with center frequency of 140 GHz is designed in the Cadence simulation environment.Compared with the traditional spiral inductor,the phase noise is improved 1.1 dBc/Hz?2.This paper combs the design idea of broadband VCO.In an ADS simulation environment,a digitally controllable differential transmission line is used to design the inductor.By analyzing the influence of each parameter of the digital controllable differential transmission line in the ADS,the design of the wideband VCO is realized by utilizing the digital controllable inductor,and the design of the wideband VCO is realized by the GF65 nm process in the Cadence simulation environment.The VCO of wide band voltage controlled oscillator is designed,and the test data of the circuit are analyzed by simulation and tape,a wide-band voltage-controlled oscillator with a frequency tuning range of about 6 GHz(139.4 GHz to 145.3 GHz)is realized.3.In this paper,a quadrature VCO based on injection locking is designed.Based on the frequency division characteristic of injection locking,the second harmonic of two VCOs is used as the injection signal to realize the orthogonal of the phase of the fundamental wave signal of the two oscillators.Using 1/4? transmission line to increase the amplitude of the second harmonic oscillator output to increase the increase in energy injection,to improve the frequency range of the quadrature signal.Simulation and optimization of the required inductance in the ADS,using GF65 nm process designed injection-locked VCO,the simulation results show that,based on the second harmonic injection locking technology can achieve the frequency range of 141.2GHz ~ 144.8GHz,the phase noise-109.69 dBc / Hz@10MHz.The phase noise improved 1.75 d B by comparing the quadrature VCO based on injection locking and the single voltage-controlled oscillator.