Research On CMOS Voltage Controlled Oscillator And Injection Locked Frequency Divider

In recent years,the rise of 5G communication has promoted a new round of technological boom,and with the increasing congestion of low-frequency spectrum,the advantages of high-frequency and wide-band of 5G communication have become more obvious.The successful application of 5G communications will bring huge changes to the world,the interconnection of all things will become possible,and smart cities will become a reality.In the implementation of 5G communication,the radio frequency transceiver module will play an important role in it.As an important module in the RF transceiver,the phase-locked loop has a great influence on the entire RF transceiver.At the same time,the phase-locked loop itself is also a subsystem,and the voltage-controlled oscillator(VCO)and injection-locked frequency divider(ILFD)are important components of it,which have an important impact on the performance of the phase-locked loop.In the 5G communication radio frequency transceivers,the requirements such as high frequency bands,wide bandwidths and low phase noise are more prominent.At the same time,this has become a research hotspot in 5G communication.Aiming at the above-mentioned hot issues,this thesis systematically learns the principles and design methods of voltage-controlled oscillators and injection-locked frequency dividers.Related issues such as the research hotspots of voltage-controlled oscillators and injection-locked frequency dividers were investigated at home and abroad.Finally,based on the CMOS process,a voltage-controlled oscillator and an injection-locked frequency divider were designed.Based on the research hotspots of 5G communication RF transceiver module,this thesis first designs a voltage-controlled oscillator.Because the 5G communication system covers multiple frequency bands,the voltage-controlled oscillator designed this time hopes to cover the 28 GHz,37GHz,and 39 GHz bands.However,designing an ultra-wideband VCO is not only difficult to design,but there will be frequencies between 28 GHz and 37 GHz that do not need to be used.Therefore,this thesis is to design a dual-band voltage-controlled oscillator,covering 28 GHz,37GHz and 39 GHz respectively.This design uses a dual-resonance circuit structure.One circuit resonates near the 28 GHz frequency band and the other circuit resonates near the 37 GHz and 39 GHz frequency bands.The operation of a certain resonant circuit is controlled by the on and off of the tail current source.At the same time,the inductive part of the two resonance circuits is coupled with a transformer.In order to expand the bandwidth,the voltage-controlled oscillator designed this time uses the technology of switched capacitors and switched coupled inductors.Then for the system integration of the above voltage-controlled oscillator,this thesis designs a new dual-band injection-locked frequency divider,which divides the signal in the 28 GHz band by two and divides the signal in the 39 GHz band by three.The frequency-divided signals all fall into approximately the same frequency range,which eases the pressure of the frequency divider bandwidth of the post-stage frequency divider and reduces the difficulty of designing the post-stage frequency divider.In order to expand the bandwidth,the injection-locked frequency divider designed this time uses the technology of switched capacitors and switched coupled inductors.