重庆邮电学院学报(自然科学版)
重慶郵電學院學報(自然科學版)
중경유전학원학보(자연과학판)
JOURNAL OF CHONGQING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS(NATURAL SCIENCE EDITION)
2006年
1期
22-25
,共4页
射频功率放犬器%前馈%互调失真
射頻功率放犬器%前饋%互調失真
사빈공솔방견기%전궤%호조실진
RF power amplifier%feedforward%intermodulation
采用线性调制技术和多载波配置的通信系统对射频功率放大器的线性提出了很高的要求,前馈技术是一种很有前途的用于提高功率放大器线性的技术.对前馈功放的工作原理进行了介绍,分析了环路中幅度、相位及延迟等环路参数对抵消性能及带宽的影响.基于这些分析的结果,设计了一个10 W的WCDMA前馈功放,三阶互调性能改善了20 dB以上.
採用線性調製技術和多載波配置的通信繫統對射頻功率放大器的線性提齣瞭很高的要求,前饋技術是一種很有前途的用于提高功率放大器線性的技術.對前饋功放的工作原理進行瞭介紹,分析瞭環路中幅度、相位及延遲等環路參數對牴消性能及帶寬的影響.基于這些分析的結果,設計瞭一箇10 W的WCDMA前饋功放,三階互調性能改善瞭20 dB以上.
채용선성조제기술화다재파배치적통신계통대사빈공솔방대기적선성제출료흔고적요구,전궤기술시일충흔유전도적용우제고공솔방대기선성적기술.대전궤공방적공작원리진행료개소,분석료배로중폭도、상위급연지등배로삼수대저소성능급대관적영향.기우저사분석적결과,설계료일개10 W적WCDMA전궤공방,삼계호조성능개선료20 dB이상.
A linear power amplifier is particularly emphasized on the system that uses linear modulation method and multicarrier configuration. The feedforward technique is a promising approach to improving the linearity of power amplifiers. The principle of operation of the feedforward power amplifiers is illustrated. Then parameters of a linearization loop, such as an amplitude imbalance, aphase imbalance and a delay mismatch, are fully analyzed to get a specific cancellation performance and linearization bandwidth. Based on the analytical results, a 10-Watt feedforward power amplifier for WCDMA applications is implemented. The third-order intermodulation (IM3) cancellation performance is improved by more than 20 dB.