抗干扰高线性射频前端设计  

Design of Anti-Interference High-Linearity RF Front-End

作　　者：陈志坚[1] 蔡敏[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2016年第1期37-43,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省经济和信息化委员会重大专项(2011912004);广东省产学研结合项目(2011A090200106);广东省高新技术产业开发区发展引导专项(2011B010700065)~~

摘　　要：为抑制干扰和提高电路的线性,采用0.13μm RF CMOS工艺设计了一款无需声表滤波器的射频前端电路系统.该设计采用一种新的带干扰消除环路可变增益低噪声跨导放大器、25%占空比本振信号的无源混频器和互阻放大器架构来实现抗干扰、低噪声、高线性的射频前端.流片和测试结果表明:该电路抑制带外强干扰达20 d B以上,在2.4 GHz可实现44.98 d B增益和2.03 d B噪声系数,同时获得-7 d Bm的输入三阶互调截点和+72 d Bm的输入二阶互调截点,实现了无需声表滤波器和抗干扰特性;整个射频前端供电电压为1.2 V,功耗为36 m A.In order to suppress interferences and improve the linearity of circuits, a SAW-less RF front-end system is designed by using a 0.13μm RF CMOS process.This design adopts a novel variable-gain low-noise transcon-ductance amplifier with a loop eliminating interferences, a 25%duty-cycle current-commutating passive mixer and a transimpedance amplifier, so as to achieve an RF front-end system of anti-interference, low noise and high linea-rity.Tapeout and test results show that the designed front-end system accomplishes the goals of 20 dB out-band in-terference rejection, 44.98 dB gain and 2.03 dB noise figure at 2.4 GHz with a -7 dBm 3rd input intermodulation point (IIP3) and a +72 dBm 2nd input intermodulation point (IIP2) being obtained, which means that the de-signed system needs no surface acoustic wave filter and is of anti-interference characteristic.In addition, the de-signed system has a power supply voltage of 1.2 V and a power consumption of 36 mA.

关 键 词：声表滤波器 射频前端 跨导放大器 无源混频器 互阻放大器 

分 类 号：TN929.531[电子电信—通信与信息系统]