基于功率检测自适应的前馈功放设计  

Design of adaptive feed-forward power amplifier based on power detection

作　　者：吴亮宇[1,2] 余勋林[1,2] 江鹏[1,2] 

机构地区：[1]武汉邮电科学研究院光纤通信技术与网络国家重点实验室,湖北武汉430074 [2]武汉虹信通信技术有限责任公司,湖北武汉430074

出　　处：《现代电子技术》2012年第14期172-174,共3页Modern Electronics Technique

摘　　要：分析了常用双环自适应前馈电路在屏蔽和宽带频率兼顾等地方的缺陷,设计了一个功率检测自适应电路。功率检测自适应应用于前馈系统第一极环路,通过MCU监控电压检测值,自动调节第一环路的移相、调幅矢量调节器,改变相位、幅度参数,以达到环路抵消最好,保证在功率与频率不断变化的情况下,误差信号提取时刻都保持最纯净。仿真结果显示,在输出125W的GSM前馈系统中,可使其IMD3小于-65dBc。The defects at some places in common double-loop adaptive feed-forward circuit where the shielding and broad- band frequency are considered are analyse. An adaptive circuit for power detection are design. The adaptive circuit for power detection is used in the first polar loop. With MCU, the voltage detection value is monitored, the first loop phase and ampli- tude vector adjuster are regulated automatically, and the phase and amplitude parameters are changed automatically to achieve the best loop offset and to ensure the most pure of the error signal in the extraction time under the continuous changing condi- tion of power and frequency. The simulation results show that the IMD3 of the feedforward system is less than -65 dBc in the GSM feedforward system whose output is 125 W.

关 键 词：前馈电路 功率检测 自适应电路 三阶交调 

分 类 号：TN710-34[电子电信—电路与系统]