Research On CMOS Dual Band Reconfigurable Mixer

With the advent of the era that Everything is connected,people's requirements for wireless communication technology are not limited to just talking freely and enjoying ultra-high-definition video.They also hope to achieve perfect control of various intelligent devices.In order to meet the needs of communication,entertainment and control of various intelligent devices at the same time,a single communication terminal can be compatible with multiple communication standards will become an important development trend of wireless communication.The proposal of ultra-wideband technology meets the requirements of compatible with multiple communication standards,and the large bandwidth can meet the needs for efficient and rapid transmission of large amounts of data.However,UWB technology has the disadvantages of low spectrum utilization and limited performance.In order to solve these shortcomings of UWB,a new broadband mode has been proposed.Multi-band functions based on reconfigurable technology can effectively solve the problem of spectrum utilization and performance.This method transforms the broadband into multiple narrow bands,which not only meets the bandwidth requirements,but also has narrow band performance.Therefore,the multi-band reconfigurable research of RF front-end circuits is of great significance.As an important module in the RF front-end circuit,the mixer is of great significance for its multi-band reconfigurable research.This article analyzes the advantages and disadvantages of the ultra-wideband mixer and the multi-band reconfigurable mixer,and summarizes and analyzes the implementation methods of the multi-band mixer in recent years as well as their corresponding advantages and disadvantages.Based on the investigation and analysis of various multi-band mixer literatures and a summary of existing multi-band technologies,two new dual-band mixer circuit structures are proposed,and two dual-band reconfigurable mixers are designed based on 55nm CMOS technology.In the design of the dual-band reconfigurable up-converter mixer,a new type of switching frequency selection matching network is used,and the MOS switch is used to control the size of inductors in the RF output matching circuit to realize the reconfigurable dual-frequency mode.When the P_LO=4dBm,the mixer achieves CG of 0.35-0.77dB,OP1dB over-3.8dBm and the isolation of LO-RF over 42.4dB in the 24-30GHz frequency band;in the 36-43GHz frequency band,the mixer achieves CG of 0.2-0.85dB,OP1dB over-2.85dBm and the isolation of LO-RF over 42.9dB.In the design of the dual-band reconfigurable down-converter mixer,a double transconductance stage structure is used in parallel.Both frequency bands are matched by transformers,and the switching between the frequency bands is controlled by a MOS switch.When the P_LO=-3dBm,the mixer achieves CG over 2.8dB,IP1dB over-6.6dBm,DSB NF less than 12.1dB and the isolation of LO-RF over 54dB in the 24-30GHz frequency band;in the 36-43GHz frequency band,the mixer achieves CG over 3.4dB,IP1dB over-6.4dBm,DSB NF less than 10.8dB and the isolation of LO-RF over 52dB.