C. N. Nzeza, A. Flament, A. Frappé, A. Kaiser, A. Cathelin, J. Muller
{"title":"Reconfigurable complex digital Delta-Sigma modulator synthesis for digital wireless transmitters","authors":"C. N. Nzeza, A. Flament, A. Frappé, A. Kaiser, A. Cathelin, J. Muller","doi":"10.1109/ECCSC.2008.4611701","DOIUrl":null,"url":null,"abstract":"Digital generation of radio-frequency signals is a key concept of software defined radio. One of the main difficulties for multi-standard transmitter design based on delta-sigma (DeltaSigma) modulators is to respect the different specifications in terms of out-of-band spurious emission. Focusing on the TX path of a UMTS/DCS1800 mobile phone, we propose hereinafter an efficient method aiming at synthesizing a complex 5th-order DeltaSigma modulator which respects the targeted standards spurious specifications. The use of a complex noise transfer function allows a better optimization of noise shaping. In addition, this approach eases the reconfiguration of the modulator, and, it is a powerful tool for all order (real and complex) DeltaSigma modulators synthesis, as it will be illustrated.","PeriodicalId":249205,"journal":{"name":"2008 4th European Conference on Circuits and Systems for Communications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2008-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2008 4th European Conference on Circuits and Systems for Communications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ECCSC.2008.4611701","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
Digital generation of radio-frequency signals is a key concept of software defined radio. One of the main difficulties for multi-standard transmitter design based on delta-sigma (DeltaSigma) modulators is to respect the different specifications in terms of out-of-band spurious emission. Focusing on the TX path of a UMTS/DCS1800 mobile phone, we propose hereinafter an efficient method aiming at synthesizing a complex 5th-order DeltaSigma modulator which respects the targeted standards spurious specifications. The use of a complex noise transfer function allows a better optimization of noise shaping. In addition, this approach eases the reconfiguration of the modulator, and, it is a powerful tool for all order (real and complex) DeltaSigma modulators synthesis, as it will be illustrated.