电子学报2016，Vol.44Issue(7)：1728-1733,6.DOI:10.3969/j.issn.0372-2112.2016.07.030
基于功放管最优负载阻抗的Doherty功率放大器效率提升方法
Efficiency I mprove ment of Doherty Power AmpIifier Through SeIection of the Power Transistor’s Opti mu m Load I mpedances
摘要
Abstract
This paper presents an approach to improve the efficiency of the Doherty power amplifier.To mitigate the efficiency degradation resulting from the imperfect load modulation and the knee voltage effect,the requirements that the load impedances of the carrier and peaking transistors should meet were outlined.Subsequently,a constant voltage standing wave ratio (VSWR)circle that was related to the carrier amplifier’s load impedances was derived and utilized to obtain the carrier transistor’s optimum load impedances.For experimental validation,an asymmetrical DPA operating at 2. 35 GHz was designed and implemented.Tested with single tone continuous wave,the proposed DPA delivers a saturation power of about 49. 3dBm and exhibits a drain efficiency of higher than 68% and 55% at peak and 8dB back-off power,respectively.When driven with 5 carriers 100MHz LTE-advanced signal,the DPA shows an average efficiency of 50. 5% at 40. 5dBm output power,along with an adjacent channel leakage ratio (ACLR)of lower than -47. 5dBc after the digital pre-distortion (DPD)correction.The experimental results demonstrated that the proposed Doherty power amplifier has high average effi-ciency and good linearity performance,which verified the effectiveness of the proposed design approach.关键词
Doherty功率放大器/高效率/等驻波比圆/数字预失真Key words
Doherty power amplifier/high efficiency/constant VSWR circle/digital pre-distortion分类
信息技术与安全科学引用本文复制引用
马传辉,潘文生,邵士海,唐友喜..基于功放管最优负载阻抗的Doherty功率放大器效率提升方法[J].电子学报,2016,44(7):1728-1733,6.基金项目
国家自然科学基金 （）
