• DocumentCode
    2618073
  • Title

    Linearization of a sigma-delta modulator by a proper loop delay

  • Author

    Gosslau, A. ; Gottwald, A.

  • Author_Institution
    Fakultaet fuer Elektrotech., Univ. der Bundeswehr Muenchen, Neubiberg, West Germany
  • fYear
    1990
  • fDate
    1-3 May 1990
  • Firstpage
    364
  • Abstract
    The influence of a loop delay on the effective transfer characteristic of the quantizer and on the linearity of a first-order sigma-delta modulator is investigated. It is shown that the idle channel noise (ICN) of a first-order sigma-delta modulator acts as a dither signal and linearizes the transfer characteristic of the 1-bit quantizer. The ICN depends on the loop delay Tdl (conversion times inside the loop). Optimum values are Tdl=0.25 T and Tdl=0.75 T (T=sampling period). These results are confirmed by calculations and simulations
  • Keywords
    analogue-digital conversion; delta modulation; modulators; 1-bit quantizer; calculations; conversion time inside loop; dither signal; first-order sigma-delta modulator; idle channel noise; linearity; linearization; loop delay; quantizer; simulations; transfer characteristic; Delay; Delta-sigma modulation; Digital filters; Feedback loop; Frequency; Harmonic distortion; Low-frequency noise; Noise shaping; Nonlinear systems; Quantization;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Circuits and Systems, 1990., IEEE International Symposium on
  • Conference_Location
    New Orleans, LA
  • Type

    conf

  • DOI
    10.1109/ISCAS.1990.112042
  • Filename
    112042
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=2618073