Bitstream switching rate based calibration of deltasigma modulators

J. Hu, J.A. Hegt, A.H.M. van Roermund, S.F. Ouzounov

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


This paper proposes a simple and effective criterion based on the switching rate of the output bit-stream of a delta-sigma modulator to estimate the performance and stability of the modulator. The switching rate and its relation to the NTF design are analyzed for both single and multi-bit delta-sigma modulators as well as lowpass and bandpass modulators. A calibration method is proposed using the switching rate as calibration parameter to adjust non-idealities such as loopfilter zero spread and excess loop delay. The loopfilter coefficients can be adjusted to calibrate the delta-sigma modulator back to the specification by comparing the measured switching rate with the desired design criterion. The proposed technique is based only on counting and requires no external stimuli or complex hardware. The switching rate is a very simple performance indicator for testing of a delta-sigma modulator without the need for an FFT, as well as a powerful input parameter for calibration.
Original languageEnglish
Title of host publicationProceedings of the 2015 IEEE International Symposium on Circuits and Systems (ISCAS), May 24-27 2015, Lisbon, Portugal
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)978-1-4799-8391-9
Publication statusPublished - 2015
Event2015 IEEE International Symposium on Circuits and Systems (ISCAS 2015) - Lisbon, Portugal, Lisbon, Portugal
Duration: 24 May 201527 May 2015


Conference2015 IEEE International Symposium on Circuits and Systems (ISCAS 2015)
Abbreviated titleISCAS 2015
Internet address


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