H桥结构的D类开关功率放大器负载特性分析  

Load-Characteristic Analysis of H-Bridge Class-D Switch-Mode Power Amplifier

作　　者：韩峰[1] 谭笑[2] 赵志远[3] 

机构地区：[1]解放军理工大学通信工程学院研究生3队,江苏南京210007 [2]总参谋部第63研究所,江苏南京210007 [3]解放军理工大学通信工程学院研究生4队

出　　处：《军事通信技术》2013年第2期88-92,共5页Journal of Military Communications Technology

摘　　要：文章对H桥(全桥)结构的D类开关功率放大器负载特性进行了理论分析与仿真验证。首先对以开关模式工作的晶体管的特性进行分析,明确了晶体管导通内阻与导通电流的变化关系。其次推导了晶体管导通内阻变化时,功放电路输出功率与漏极效率的表达式,利用ADS进行仿真验证,仿真结果和理论结果基本一致。最后分析推导了不同供电电压条件下,电路的负载特性,可以为设计满足指标要求的电路提供指导。This paper analyzed the load characteristics of H-Bridge Class-D switch-mode power amplifier and simulation was operated in ADS. In the first instance, the operating charac- teristics of the transistor acting as switch was analyzed and the trend of on-resistor of the transis- tor was comprehended, and then the way it affected the load characteristics of PA was analyzed. The equations of the output power and the drain efficiency were derived. Simulation results and theoretical results were in good agreement. Furthermore, comparisons about the relationship be- tween the supply voltage and the load characteristic were conducted.

关 键 词：全桥结构 开关放大器 负载特性 供电电压 

分 类 号：TN7[电子电信—电路与系统]