• DocumentCode
    1520684
  • Title

    On Continuous-Time \\Delta \\Sigma Modulators With Return-to-Open DACs

  • Author

    Pavan, Shanthi

  • Author_Institution
    Indian Inst. of Technol., Chennai, India
  • Volume
    58
  • Issue
    5
  • fYear
    2011
  • fDate
    5/1/2011 12:00:00 AM
  • Firstpage
    284
  • Lastpage
    288
  • Abstract
    We examine the alias rejection of continuous-time ΔΣ modulators (CTDSMs) with return-to-open (RTO) feedback digital-to-analog converters (DACs). We show that using an RTO DAC can compromise the alias rejection of the CTDSM around odd multiples of the sampling rate. The intuition and theory behind this curious phenomenon are given. A circuit technique that mitigates this problem is proposed, and its efficacy is verified with simulations.
  • Keywords
    delta-sigma modulation; CTDSM; RTO feedback; continuous-time ΔΣ modulator; digital-to-analog converter; return-to-open DAC; Bandwidth; Capacitors; Frequency modulation; Noise; Switches; Transconductance; Alias rejection; CIFB; CIFF; DAC; continuous-time; data conversion signal transfer function (STF); modulator; noise transfer function (NTF); oversampling; return to open; return to zero; sigma delta;
  • fLanguage
    English
  • Journal_Title
    Circuits and Systems II: Express Briefs, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1549-7747
  • Type

    jour

  • DOI
    10.1109/TCSII.2011.2124930
  • Filename
    5771064
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1520684