{"title":"Differential source-pull on the WCDMA receiver","authors":"C. Guan, Chris Liu","doi":"10.1109/RFIC.2011.5940701","DOIUrl":null,"url":null,"abstract":"A practical approach to source-pull differential input LNA is presented using a single-ended RF tuner adapted by a balun. The adaptation only considers balun's differential mode S-parameters for the reference plane extension. Error analysis on neglecting common mode S-parameters provides guidelines to choose proper balun for better adaptation accuracy: a) higher common-mode rejection ratio, b) less reflection on the unbalanced port and c) less insertion loss. The approach is applied to the NF optimization on a cellular WCDMA receiver. The resultant source pull estimation correlates well with the final optimal matching network. The minimum NF is achieved at 2.3dB.","PeriodicalId":448165,"journal":{"name":"2011 IEEE Radio Frequency Integrated Circuits Symposium","volume":"6 5","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2011 IEEE Radio Frequency Integrated Circuits Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/RFIC.2011.5940701","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
A practical approach to source-pull differential input LNA is presented using a single-ended RF tuner adapted by a balun. The adaptation only considers balun's differential mode S-parameters for the reference plane extension. Error analysis on neglecting common mode S-parameters provides guidelines to choose proper balun for better adaptation accuracy: a) higher common-mode rejection ratio, b) less reflection on the unbalanced port and c) less insertion loss. The approach is applied to the NF optimization on a cellular WCDMA receiver. The resultant source pull estimation correlates well with the final optimal matching network. The minimum NF is achieved at 2.3dB.
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