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Improved Offline Calibration of DAC Mismatch Errors in Delta-Sigma Data Converters
, Raviteja Theertham
Published in Institute of Electrical and Electronics Engineers Inc.
2019
Volume: 66
   
Issue: 10
Pages: 1618 - 1622
Abstract
Element mismatch in the digital-to-analog converter (DAC) of a multibit Δ Σ data-converter greatly degrades the modulator's in-band performance. One approach to correct these errors is to use an offline calibration method, based on measuring the output of the modulator in response to an in-band sinusoid. The drawback of this method, however, is the necessity for a distortion-free input sine-wave excitation. We propose a technique that dispenses with the need for a distortion-free input, thereby paving the way for the generation of the input tone on-chip. Apart from being a useful tool for debugging designs, it is a potential candidate for foreground calibration. Experimental results from a multibit modulator test chip, designed in a 180nm CMOS technology, are given. © 2019 IEEE.
About the journal
JournalData powered by TypesetIEEE Transactions on Circuits and Systems II: Express Briefs
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN15497747
Open AccessNo
Concepts (13)
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    Calibration
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    Digital to analog conversion
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    MODULATORS
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    Program debugging
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    ELEMENT MISMATCH
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    FOREGROUND CALIBRATIONS
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    Least square
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    MULTI BIT DELTA SIGMAS
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    MULTI-BITS
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    OFFLINE CALIBRATIONS
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    Over sampling
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    SIGMA DELTA
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    Analog to digital conversion