2GHz宽阻带低噪声放大器的协同设计  

Co-Designed of 2 GHz Wide Stop-Band Low Noise Amplifier

作　　者：李静[1] 张文梅[1] 

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《测试技术学报》2008年第5期397-400,共4页Journal of Test and Measurement Technology

基　　金：国家自然科学基金资助项目(60771052);山西省自然科学基金资助项目(2006011029);太原市科技资助项目(0703004)

摘　　要：去除了低噪声放大器(LNA)与带通滤波器之间的50Ω的匹配界面,用带通滤波器代替低噪声放大器的输出匹配网络,将二者进行协同设计.采用的滤波器具有宽阻带,能够直接滤除二次谐波.仿真结果表明,协同设计后,LNA的稳定性得到了有效的改善,在整个频段内达到了绝对稳定;在中心频率2 GH z处,增益为14.593 dB,噪声系数为2.668 dB;谐波抑制效果也很明显,二次谐波处S21为-71.140 dB.The traditional 50Ω interface between the low noise amplifier （LNA） and the band-pass filter is removed, and the band-pass filter is used as output matching network of LNA directly and co-designed with LNA. The filter with a wide stop-band can suppress second harmonics directly. Simulated results show that after co-design the stability of LNA has been effectively improved in the entire frequency band and achieved absolute stability. The LNA has achieved the voltage gain of 14.593dB, noise figure of 2.668 dB at 2 GHz and harmonic suppression of -71.140 dB at 2^nd harmonic.

关 键 词：射频前端 协同设计 滤波器 低噪声放大器 稳定性 

分 类 号：TN722.3[电子电信—电路与系统]