Research And Design Of Ultra Wideband Low Power RF Front-End Circuit

Recently,with the development of wireless communication technology,the demand for large capability and high performance wireless communication systems has been on a great upsurge.Since the release of ultra-wideband(UWB)by the Federal Communications Commission(FCC),UWB systems,whose frequency bands are from 3.1 to 10.6GHz,have been actively researched in industrial and academic fields because of their low power consumption,high data rates(up to 1Gb/s)within short distances,strong anti-interference ability,high spectrum efficiency,large system capacity,etc.However,with the rapid development of smart wireless handheld terminals,power consumption is a bottleneck for its further development.So the research and design of low power ultra-wideband radio receiver chip has great theoretical and practical significance.Based on the above background,by reading the literature and theoretical analysis,the proposed low noise amplifier(LNA)and down-conversion Mixer circuits used in UWB receiver front-end has low power performance.The main results of this study are as follows:(1)A low-power,highly linear and high gain low noise amplifier circuit is presented.Common-gate topology is used to obtain wide-band input matching,the forward body biasing technique and current reuse technique are employed to reduce the power consumption,the post-distortion technique is used to enhance the linearity performance.When the supply voltage is 1.2V,the simulation results are as follows:In 2?12GHz,input reflection coefficient S11 below-10.1dB,output reflection coefficient S22 below-15.2dB,the maximum conversion gain is 16.9dB,the minimum noise figure is 2.6dB,IIP3 is lOdBm,the power consumption of the whole circuit is only 1.9mW,which indicate that the proposed low noise amplifier circuit can achieve good performances under low power consumption.(2)A low-voltage,low-power and low-noise active down-conversion Mixer is proposed.The circuit is based on the traditional Gilbert double-balanced topology.The bulk-injection technique is implemented for low supply voltage,thus resulting in low power consumption.A switched biasing technique is adopted to reduce noise.When the supply voltage is 0.79V,the simulation results show that the frequency band is from 0.6 to 12GHz,conversion gain is from 9.5 to 13.1dB,noise figure is from 8.1 to 11.7dB,IIP3 is-10dBm,the power consumption is only 0.8mW.The above simulation results show that the Mixer circuit achieve low voltage,low power,and low noise performances.The proposed circuits are designed in 0.18um RF CMOS technology.ADS2008 software is employed to accomplish the simulation,Virtuoso Layout Editor to finish the layout design.Compared with the recently related designs,we know that the proposed circuits have certain advantages of simpler circuit structure,wider frequency band,keep other excellent performance under the condition of low power consumption.At last,the paper summarizes the Low Noise Amplifier and Mixer circuits design,and has put forward the direction of the following work.