{"title":"Multiband and Wide Dynamic Range Digital Polar Transmitter Using Current-Mode Class-D CMOS Power Amplifier","authors":"T. Nakatani, D. Kimball, P. Asbeck","doi":"10.1109/CSICS.2013.6659240","DOIUrl":null,"url":null,"abstract":"Techniques are demonstrated to extend the power control dynamic range of a digitally-driven 0.15 um CMOS polar power amplifier to the degree needed for WCDMA handset applications. The output frequency can be tuned over the 0.75-2GHz range, using an on-chip band-switching resonator, and output power of 27-29 dBm is attained. By partitioning the switching PA into multiple 3-state unit cells, power dynamic ranges of 91 / 85 dB are achieved at 0.85 / 1.75 GHz while maintaining high efficiency. By introducing a buck converter that can act not only with pulse width modulation but also in charge sampling mode, the overall DC power consumption in the power back- off regime can be reduced by a factor of approximately 0.7.","PeriodicalId":257256,"journal":{"name":"2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2013 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CSICS.2013.6659240","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
Techniques are demonstrated to extend the power control dynamic range of a digitally-driven 0.15 um CMOS polar power amplifier to the degree needed for WCDMA handset applications. The output frequency can be tuned over the 0.75-2GHz range, using an on-chip band-switching resonator, and output power of 27-29 dBm is attained. By partitioning the switching PA into multiple 3-state unit cells, power dynamic ranges of 91 / 85 dB are achieved at 0.85 / 1.75 GHz while maintaining high efficiency. By introducing a buck converter that can act not only with pulse width modulation but also in charge sampling mode, the overall DC power consumption in the power back- off regime can be reduced by a factor of approximately 0.7.
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