南京大学学报(自然科学版) ›› 2012, Vol. 48 ›› Issue (5): 671–676.
• • 上一篇
张晓东1，王钟1，高怀2，程建春1，吴浩东1**
Zhang Xiao-Dong1,Wang Zhong1，Gao Huai2，Cheng Jian-Chun1 ,Wu Hao-Dong1
摘要： 宽带功率放大器是现代多频段无线通信系统中的关键器件.Cascode结构由于其良好的带宽特性以及输出阻抗特性，被广泛应用在宽带功率放大器的设计当中.带宽和线性是宽带功率放大器的重要指标.通常用RLC补偿网络可以增加Cascode结构功率放大器的带宽.木文提出通过选择合适的RLC补偿网络电路参数，使得晶体管处于良好的工作状态，可以实现在增加Cascode放大器带宽的同时，改善其线性度.从电路原理上分析了—补偿网络改善功率放大器非线性的原因，并利用Volterra
级数方法计算了三阶交调截止点IP3)，证实了IP3可以改善3 dB士.采用2µm lnGaP/GaAs HBT半导体工艺流片后，测试结果表明，其3 dB工作宽带扩展了1GHz(带宽从1. 5 UHz扩展到2. 5 GHz) , IP3改善了3dB，与计算结果非常一致.
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