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Linearization of power amplifiers with mismatched output impedance using on-line digital pre-distortion structure 使用在线数字预失真结构对输出阻抗不匹配的功率放大器进行线性化
IEICE Electronic Express Pub Date : 2019-04-16 DOI: 10.1587/ELEX.16.20190207
Lamin Zhan, Yuxuan Ouyang, Guoan Wu, Baoquan Hu, Xiang Zhang
{"title":"Linearization of power amplifiers with mismatched output impedance using on-line digital pre-distortion structure","authors":"Lamin Zhan, Yuxuan Ouyang, Guoan Wu, Baoquan Hu, Xiang Zhang","doi":"10.1587/ELEX.16.20190207","DOIUrl":"https://doi.org/10.1587/ELEX.16.20190207","url":null,"abstract":"This letter introduces a novel on-line digital pre-distortion structure for linearizing RF power ampli fi er under the output impedance mismatch conditions. Unlike traditional o ff -line structures, the proposed structure updates its weight parameters adaptively synchronizing with the power ampli fi er load impedance. Furthermore, this letter analyses with a MOSFET model and proves that the output conductance of MOSFET are relevant to nonlinearity of power ampli fi er with variable load impedance. To verify this structure and the analysis, a simulation on MATLAB Simulink was built using a N-channel MOSFET based on Shichman-Hodges model. Proposed on-line Digital Pre-Distortion structure signi fi cantly acquired better linearity performance with variable load impedance than conventional o ff -line structures.","PeriodicalId":364041,"journal":{"name":"IEICE Electronic Express","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123499940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Design of compact active BeiDou antenna for high-shock projectile applications 高冲击弹丸用紧凑型北斗有源天线设计
IEICE Electronic Express Pub Date : 2019-04-10 DOI: 10.1587/ELEX.16.20190119
Xin Ma, Xiaochen Chen, Lingwen Xiao, Na Wang, Siyang Sun
{"title":"Design of compact active BeiDou antenna for high-shock projectile applications","authors":"Xin Ma, Xiaochen Chen, Lingwen Xiao, Na Wang, Siyang Sun","doi":"10.1587/ELEX.16.20190119","DOIUrl":"https://doi.org/10.1587/ELEX.16.20190119","url":null,"abstract":"A novel compact active BeiDou helical antenna, operating at normal mode is proposed for high-shock projectile applications. To achieve excellent impedance matching, a grounded matching stub is introduced in this design. For demonstration, a prototype with extremely compact size (22 × 22mm) is fabricated and measured. The measured re fl ection coe ffi cients below 10-dB is almost 15MHz centered at 1268MHz. Omni-directional radiation pattern of the proposed antenna is realized. Additionally, stable signal reception under various motion attitudes could also be proved by experiments.","PeriodicalId":364041,"journal":{"name":"IEICE Electronic Express","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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