Design Of Mmwave Receiver In CMOS

Millimeter-Wave(mmWave)circuits exhibit great research value in future wireless communication or radar systems.Advanced CMOS technologies also show the potential to be a strong candidate for mmWave applications.Hence,this thesis studies the CMOS mmWave receiver design,with emphasis on CMOS transistors,on-chip passives,low-noise amplifier(LNA)and receiver at mmWave frequencies.This thesis first studies CMOS transistor deisgn at mmWave frequencies.The transistor design is optimized based on detailed analysis of transistors' gain and noise performance.During the analysis,the focus is on the influence of gate resistance to gain and noise performance.Then,stability of transistors is analyzed.The neutualization technique is introduced to improve the stability,while its drawbacks are also discussed.Then,this thesis discusses the design and optimization of commonly-used on-chip passives in mmWave circuits,including capacitors,inductors,transmission lines and transformers.We also compare the feature and performance of different transmission line and transformer structures,and study the methodologies for transmission line and transformer design and optimization.After that,this thesis designs a mmWave LNA for the 77-GHz automotive radar based on the analysis of transistors and passives.We first discuss the basics and structures of LNA,and the topology of three-stage pseudodifferential common-source amplifier is chosen.In each stage,neutualization capacitors are used to improve the gain and stability.Then,we analyze the design of input and interstage matching networks in the proposed LNA,and complete the layout design and chip implementation with 40-nm CMOS process.This LNA exhibits a measured peak power gain of 15.9 dB at 81 GHz,and its 3-dB bandwidth is 75~93 GHz.The simulated minimum noise figure is 5.9 dB.Finally,this thesis designs a mmWave receiver for the 77-GHz automotive radar.We first introduce the operation of mmWave radars,and determine the topology of the proposed receiver.The direct-conversion architecture is seleced and the receiver including an LNA,a passive double-balanced mixer and a gain-variant intermediate-frequency(IF)amplifier.Accordting to the simulation,this mmWave reciver shows a RF bandwidth of 80~94 GHz,an IF bandwidth of 0.1~5.5 MHz.The maximum conversion gain is 56 dB,and the minimum noise figure is 6.8 dB.