Improved Offline Calibration of DAC Mismatch Errors in Delta-Sigma Data Converters

Element mismatch in the digital-to-analog converter (DAC) of a multibit ΔΣ 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...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2019-10, Vol.66 (10), p.1618-1622
Main Authors: Pavan, Shanthi, Theertham, Raviteja
Format: Article
Language:English
Subjects:
analog-to-digital conversion
Calibration
Circuits and systems
CMOS
Data converters
Debugging
Digital to analog conversion
Digital to analog converters
Distortion
Harmonic analysis
least-squares
Mathematical model
Modulation
multibit
Oversampling
Sigma-Delta
Thermometers
Wave excitation
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Summary:Element mismatch in the digital-to-analog converter (DAC) of a multibit ΔΣ 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.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2019.2921777