Undersampled LC bandpass ΣΔ modulators with feedback FIRDACs

Abla Kammoun*, Nicolas Beilleau, Hassan Aboushady

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations


A general technique for the design of undersampled LC bandpass modulators using feedback FIRDACs is proposed. The coefficients of the FIRDACs are used to increase the degrees of freedom in order to perform an exact equivalence between undersampled LC bandpass Sigma-Delta and high order DiscreteTime Sigma-Delta modulators. Using FIRDACs coefficients, it is also possible to simplify the circuit implementation by removing internal summing nodes and by decreasing coefficients spread. An undersampled 4th order LC Sigma-Delta is given as a design example. The effect of the undersampling ratio on the performance of finite quality factor LC Sigma-Delta modulators is also studied.

Original languageEnglish (US)
Title of host publicationISCAS 2006
Subtitle of host publication2006 IEEE International Symposium on Circuits and Systems, Proceedings
Number of pages4
StatePublished - 2006
Externally publishedYes
EventISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
Duration: May 21 2006May 24 2006


OtherISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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