一种零中频通用射频前端的设计及实现  

Design and Implementation of a General Zero-IF RF Front-End

作　　者：左盼盼[1] 赛景波[1] 

机构地区：[1]北京工业大学电子信息与控制工程学院,北京100124

出　　处：《电子器件》2016年第1期132-139,共8页Chinese Journal of Electron Devices

摘　　要：针对传统超外差式架构构成的通用射频前端,其体积大、结构复杂、实现难度大、成本高、需要很高的镜像抑制性能等缺点,设计了一种采用零中频结构构成的通用射频前端,其工作频段为800 MHz^2400 MHz。该射频前端在一款高性能解调器的基础上,加入宽带低噪声放大器、程控射频AGC电路、电调谐预选滤波器等电路,从而实现灵敏度优于-100 d Bm/5 MHz,动态范围大于100 d B的设计指标要求。In allusion to that traditional RF front-end for superheterodyne architecture is bulky,complex,difficult to implement and costly and requires high image rejection performance and other shortcomings,a general RF front-end with Zero-IF structure at a working frequency in 800 MHz^2 400 MHz was designed. This RF front-end bases on a high performance demodulator including a wide band low noise amplifier,programmable RF AGC circuit,electrical tuned pre-selection filter etc,and therefore achieves the design criteria with a sensitivity better than-100 dBm/5 MHz,and a dynamical range larger than 100 dB.

关 键 词：射频前端 零中频 低噪声放大器 自动增益控制 正交解调 

分 类 号：TN851[电子电信—信息与通信工程]