{"title":"Performance limitation by finite gbw in continuous-time quadrature bandpass sigma-delta modulators","authors":"Song-Bok Kim, M. Robens, R. Wunderlich, S. Heinen","doi":"10.1109/ISSCS.2009.5206192","DOIUrl":null,"url":null,"abstract":"Continuous-time quadrature bandpass sigma-delta modulators seriously suffer from finite gain bandwidth of the amplifiers they contain. In this paper, the performance limitation of the continuous-time quadrature bandpass sigma-delta modulator caused by finite gain bandwidth is presented. Finite gain bandwidth results in an unstable behavior of the complex integrators and a deviation from the center frequency. In order to improve stability of the complex integrator by finite GBW, it is desirable to employ a lossy integrator. The deviation from the center freqency affects the in-band noise power of the modulator. A compensation solution for reducing the deviation from the center frequency is proposed by means of transconductors at the amplifier inputs.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 International Symposium on Signals, Circuits and Systems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISSCS.2009.5206192","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
Continuous-time quadrature bandpass sigma-delta modulators seriously suffer from finite gain bandwidth of the amplifiers they contain. In this paper, the performance limitation of the continuous-time quadrature bandpass sigma-delta modulator caused by finite gain bandwidth is presented. Finite gain bandwidth results in an unstable behavior of the complex integrators and a deviation from the center frequency. In order to improve stability of the complex integrator by finite GBW, it is desirable to employ a lossy integrator. The deviation from the center freqency affects the in-band noise power of the modulator. A compensation solution for reducing the deviation from the center frequency is proposed by means of transconductors at the amplifier inputs.
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