{"title":"A multicarrier QAM-modulator for WCDMA basestation with on-chip D/A converter","authors":"M. Kosunen, J. Vankka, M. Waltari, K. Halonen","doi":"10.1109/CICC.2001.929784","DOIUrl":null,"url":null,"abstract":"A multicarrier QAM modulator for a wideband code division multiple access (WCDMA) basestation has been designed. The multicarrier modulator performs pulse shaping filtering for four baseband I and Q data streams. Input data is interpolated in four stages each interpolating by a factor two. Four independent carriers are generated and modulated with the CORDIC based numerically controlled oscillators (NCOs) and summed up to form a multicarrier WCDMA signal. SINC-attenuation effect of a D/A converter is canceled by an inverse-SINC predistortion filter. The multicarrier signal is converted to the analog domain with a 14-bit current steering D/A converter which is integrated on the same silicon chip. Process used in realization of the chip is a 0.35 /spl mu/m BiCMOS process. However, only CMOS transistors are used.","PeriodicalId":101717,"journal":{"name":"Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CICC.2001.929784","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
A multicarrier QAM modulator for a wideband code division multiple access (WCDMA) basestation has been designed. The multicarrier modulator performs pulse shaping filtering for four baseband I and Q data streams. Input data is interpolated in four stages each interpolating by a factor two. Four independent carriers are generated and modulated with the CORDIC based numerically controlled oscillators (NCOs) and summed up to form a multicarrier WCDMA signal. SINC-attenuation effect of a D/A converter is canceled by an inverse-SINC predistortion filter. The multicarrier signal is converted to the analog domain with a 14-bit current steering D/A converter which is integrated on the same silicon chip. Process used in realization of the chip is a 0.35 /spl mu/m BiCMOS process. However, only CMOS transistors are used.
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