Design Of CMOS Millimeter-wave Broadband Voltage-Controlled Oscillator And Frequency Divider

With the rapid development of wireless communication technology,the bandwidth requirements of communication systems have become higher and higher.Due to the increasingly tense spectrum resources and the limited transmission rate,the past low-frequency bands have been increasingly unable to meet the needs of people's daily life.It has been an inevitable trend for wireless communications to develop towards higher frequency bands.Millimeter wave is an electromagnetic wave with a frequency of 30~300GHz.Because of its short wavelength and wide frequency band,millimeter waves can effectively solve many problems faced by high-speed broadband wireless access.Therefore,it has a wide application prospect in short-range communication.As a key circuit in a millimeter wave transceiver system,a voltage controlled oscillator(VCO)and a frequency divider work at the highest frequency of the link,and its performance directly affects the performance of the transceiver system and so it is an important part of the study of millimeter wave integrated circuits.In this thesis,the research significance and current research progresses of CMOS millimeter-wave voltage-controlled oscillators and frequency dividers are first described.Then the wideband structure,performance parameters and design methods of voltage-controlled oscillators and frequency dividers are analyzed.Finally,A wideband(73.3~88.1GHz)voltage-controlled oscillator and a wideband(81~110GHz)injection-locked frequency divider are designed based on 65 nm CMOS process.The simulation results have met the expected requirements.The main research work is as follows:1.This thesis studies the design of CMOS MMW wideband VCO.By using the switch-coupled inductor structure and changing the coupling coefficient of the inductor through on-off switching to change the inductance value in the ADS simulation environment and then the circuit is designed in the Cadence simulation environment.This thesis achieve the center frequency of 80 GHz and the output frequency tuning range of 14.8GHz(73.3 ~ 88.1GHz)broadband voltage-controlled oscillator through the simulation of the circuit data.Compared with the traditional capacitor tuning,the voltage range of the VCO designed with the inductor of the structure is greatly increased.2.The design of wideband injection-locked divider has been studied.Based on 65 nm CMOS process,a wide range of millimeter-wave injection-locked frequency divider(ILFD)is realized by using circuit multiplexing technology and dual-mixing technology,which effectively expands the locking range of the divider without extra power.The simulation results show that the locking range of the input frequency is 81 ~ 110 GHz when the tuning voltage ranges from 0 to 1.2 V.The power of the circuit is 5.74 m W excluding buffers from a 0.8 V supply voltage.The divider is suitable for W-Band(75 to 110 GHz)system applications.