A High Linearity and Efficiency Doherty Power Amplifier for Retrodirective Communication
This paper presents a Doherty power amplifier with advanced design methods for high efficiency and linearity applied to retrodirective communication system for high peak to average power ratio (PAR). A special inverted Doherty topology is proposed in order to optimize the average efficiency of Doherty amplifier. Also we develop Doherty power amplifier with uneven power drive which is provided more input power to the peak amplifier than carrier amplifier for full power operation and appropriate load modulation. These methods are applied to implement Doherty power amplifier using GaAs FET. The amplifier is optimized at large power back-off. The power added efficiency (PAE) and adjacent channel leakage ratio (ACLR) are 33.1％ and -47 dBc, which improves about 3.2％ and 5 dB respectively, its third-order intermodulation distortion (IMD3) has 2.5 dB improvement compared with conventional Doherty power amplifier.
Xiaoqun Chen Yuchun Guo Xiaowei Shi
National Key Laboratory of Antennas and Microwave Technology,Xidian University Xian 710071,China
国际会议
Progress in Electromagnetics Research Symposium 2008(2008年电磁学研究新进展学术研讨会)(PIERS 2008)
杭州
英文
1-6
2008-03-24（万方平台首次上网日期，不代表论文的发表时间）