A HIGH SENSITIVITY AND WIDE DYNAMIC RANGE ZERO-IF RF RECEIVER FOR COGNITIVE RADIO APPLICATION  

作　　者：Liu Jing Zhu Xiaowei Zhang Xiaodong You Changjiang 

机构地区：[1]State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China

出　　处：《Journal of Electronics(China)》2010年第5期696-700,共5页电子科学学刊（英文版）

基　　金：Supported by the National High-Tech Project (No. 2009AA011801);National Natural Science Foundation of China (No. 60621002)

摘　　要：This paper presents an RF receiver of zero-Intermediate Frequency(IF) architecture for Cognitive Radio(CR) communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in low cost,compact volume,and low power dissipation.The receiver employs three digital attenuator and a high gain,high linearity low noise amplifier to achieve wide dynamic range of 70 dB and high receiving sensitivity of-81 dBm.A fully balanced I/Q demodulator and a differential Local Oscillator(LO) chips are used to minimize the negative effects caused by second-order distortion and LO leakage.In order to select an 8 MHz-channel from 14 continuous ones located in UHF band(694-806 MHz) accurately,approach of channel selectivity circuits is proposed.The RF receiver has been designed,fabricated,and test.The measured result shows that the noise figure is 3.4 dB,and the error vector magnitude is 7.5% when the input power is-81 dBm.This paper presents an RF receiver of zero-Intermediate Frequency（IF） architecture for Cognitive Radio（CR） communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in low cost,compact volume,and low power dissipation.The receiver employs three digital attenuator and a high gain,high linearity low noise amplifier to achieve wide dynamic range of 70 dB and high receiving sensitivity of-81 dBm.A fully balanced I/Q demodulator and a differential Local Oscillator（LO） chips are used to minimize the negative effects caused by second-order distortion and LO leakage.In order to select an 8 MHz-channel from 14 continuous ones located in UHF band（694-806 MHz） accurately,approach of channel selectivity circuits is proposed.The RF receiver has been designed,fabricated,and test.The measured result shows that the noise figure is 3.4 dB,and the error vector magnitude is 7.5% when the input power is-81 dBm.

关 键 词：Cognitive Radio (CR) RF receiver Zero-Intermediate Frequency (IF) Channel selection Signal-to-Noise Ratio (SNR) 

分 类 号：TN851[电子电信—信息与通信工程]