Digital self-correction of time-interleaved ADCs

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Abstract

A well known problem of time-interleaved analogto-digital converters is the matching between the individual channels of the converter. Any mismatch between the channels affects the accuracy of the converter adversely. The random mismatch between the channels originates mainly from the mismatch of components like transistors and capacitors. To achieve a certain degree of matching between the channels, the sizes of the individual components have to be chosen accordingly. Especially for high-resolution converters, this means that physically large transistors are required, resulting in a large chip area, increased power consumption and reduced conversion speed. Instead of increasing sizes to achieve a certain accuracy, one can also start with an analog circuit that is relatively inaccurate from itself (allowing physically small devices), and use a digital post-correction technique afterwards to correct for the actual deviations of each component. With this method, a high accuracy can be obtained while the requirements for the components are relaxed significantly. Although these techniques have been available for single-channel converters for many years, techniques correcting the mismatch between several channels are scarce. In this paper, an existing algorithm for single-channel pipelined converters is extended to include inter-channel correction as well, requiring almost no additional hardware.
Original languageEnglish
Title of host publicationProceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2005) 23 - 26 May 2005, Kobe, Japan
Place of PublicationPiscataway, New Jersey, USA
PublisherInstitute of Electrical and Electronics Engineers
Pages5541-5544
ISBN (Print)0-7803-8834-8
Publication statusPublished - 2005
Event2005 IEEE International Symposium on Circuits and Systems (ISCAS 2005) - Kobe, Japan
Duration: 23 May 200526 May 2005

Conference

Conference2005 IEEE International Symposium on Circuits and Systems (ISCAS 2005)
Abbreviated titleISCAS 2005
CountryJapan
CityKobe
Period23/05/0526/05/05

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  • Cite this

    Harpe, P. J. A., Zanikopoulos, A., Hegt, J. A., & Roermund, van, A. H. M. (2005). Digital self-correction of time-interleaved ADCs. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2005) 23 - 26 May 2005, Kobe, Japan (pp. 5541-5544). Piscataway, New Jersey, USA: Institute of Electrical and Electronics Engineers.