一种接收前端三级低噪声放大器的设计  

A three-stage,low-noise amplifier in frontend of radar receiver

作　　者：林震鹊[1] 兰怀亮 李帅[1] 

机构地区：[1]安徽省电子制约技术重点实验室 [2]75766部队

出　　处：《雷达与对抗》2009年第2期38-40,44,共4页Radar & ECM

基　　金：安徽省电子制约技术重点实验室基金项目(编号:2007B002005E)

摘　　要：针对单片雷达接收机中对低噪声放大器（LNA）的要求，采用CMOS0．18m工艺设计了三级级联的镜像抑制低噪声放大器。通过在低噪声放大器中接入陷波滤波器，实现对镜像信号的衰减，从而减小了后端混频器电路的设计难度。在ADS中对放大器进行仿真，结果表明：在最大供电电压为5V、信号频段为3．0～3．2GHz时，中频输出225MHz，功率增益31dB，噪声系数（NF）0．5dB，输入输出1—dB点的功率分别为-19．5和11．5dBm，对镜像信号的抑制度达22dB。A cascaded three-stage, low-noise amplifier （LNA） with mirror signal suppression is designed with the adoption of the CMOS 0.18 m technology for the radar monolithic receiver. With the notch filter in LNA, the attenuation of mirror signals is realized, which makes the design of the circuit of the back - end mixer easier. The amplifier is simulated in ADS, and the results show that when the highest supplied voltage is 5 V with the frequency range of the signal from 3.0 to 3.2 GHz, the IF out-put is 225 MHz with the power gain 31 dB and the noise factor （NF） 0.5 dB, and the power at input and output 1-dB is respectively - 19.5 dBm and 11.5 dBm with the suppression reaching 22 dB for mirror signals.

关 键 词：雷达接收机 CMOS 低噪声放大器 陷波滤波器 

分 类 号：TN722.3[电子电信—电路与系统]