大动态宽带数字中频接收机的优化设计.pdf

24 4 Vol. 24No .4 2004 4 Transactions of Beijing Instit ute of Technology Apr . 2004 : 1001-064 (2004) 04-03 3-04 曹　鹏, 　陈　宁, 　齐　伟, 　李伟强, 　王　彦, 　费元春 ( , 100081) : DIFR , . 3 RFAF( ) , DIFR RFAF , RF AGC . 10 MHz, - 100- 10 dB, 80 M Hz DIFR , RF , RFAF DIFR RF AGC , . : ; ; ; : T N 8 0. 1; TN 8 0. 3: A Optimization of a Large Dynamic Range and Broadband Digital Intermediate Frequency Receiver CAO Peng, CHEN Ning, QI Wei, LI Wei-qiang, WANG Yan, FEI Yuan-chun ( , , Department of Electronic Engineering School of Information Science and Technology Beijing Institute of Technology, Beijing 100081, China) Abstract: A digital intermediate frequency receiver is optimized based on the state of art engineering implementation techniques, and three typical RFAF ( radio frequency analog front- end) circuits are compared and simulated, and then the circuit architecture and features of RFAFs suitable for a large dynamic range and broadband digital receiver are discussed A new type of. digital RF A GC circuit is provided. A DIFR w ith 10 M Hz bandwidth, - 100- 10 dB dynamic range and 80 M Hz sampling rate is optimized, the parameters allocation and optimization of the , , RFAF are studied the relationship betw een the RFAFs gain noise factor as against the dynamic , . range and RF AGC code of the DIFR is deduced and simulated Key words: broadband receivers; large dynamic range; digital intermediate frequency ; optimization DIFR( )