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Elbornsson, Jonas
Publications (10 of 24) Show all publications
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. E. (2005). Analysis of Mismatch Effects in Randomly Interleaved A/D Converter System. IEEE Transactions on Circuits And Systems Part I: Fundamental Theory and Applications, 52(3), 465-476
Open this publication in new window or tab >>Analysis of Mismatch Effects in Randomly Interleaved A/D Converter System
2005 (English)In: IEEE Transactions on Circuits And Systems Part I: Fundamental Theory and Applications, ISSN 1057-7122, E-ISSN 1558-1268, Vol. 52, no 3, p. 465-476Article in journal (Refereed) Published
Abstract [en]

To significantly increase the sampling rate of an A/D converter (ADC), a time interleaved ADC system is a good option. The drawback of a time interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain and offset mismatch errors are introduced in the ADC system. These errors cause non harmonic distortion in the sampled signal. One way to decrease the impact of the mismatch errors is to spread the distortion over a wider frequency range by randomizing the order in which the ADCs are used in the interleaved structure. In this paper we analyze how the spectrum is affected by mismatch errors in a randomly interleaved ADC system. We also discuss how the mismatch errors can be estimated.

Keyword
A/D conversion, Nonuniform sampling, Random sampling
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-46136 (URN)
Note

DOI does not work: 10.1109/TCSI.2004.8384334

Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2018-03-06
Elbornsson, J., Gustafsson, F. & Eklund, J. (2005). Blind equalization of time errors in a time-interleaved ADC system. IEEE Transactions on Signal Processing, 53(4), 1413-1424
Open this publication in new window or tab >>Blind equalization of time errors in a time-interleaved ADC system
2005 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 53, no 4, p. 1413-1424Article in journal (Refereed) Published
Abstract [en]

To significantly increase the sampling rate of an analog-to-digital converter (ADC), a time-interleaved ADC system is a good option. The drawback of a time-interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain, and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal. In this paper, we present a method for estimation and compensation of the time mismatch errors. The estimation method requires no knowledge about the input signal, except that it should be band limited to the foldover frequency pi/T-s for the complete ADC system. This means that the errors can be estimated while the ADC is running. The method is also adaptive to slow changes in the time errors. The Cramer-Rao bound (CRB) for the time error estimates is also calculated and compared. to Monte Carlo simulations. The estimation method has also been validated on measurements from a real time-interleaved ADC system with 16 ADCs.

Keyword
A/D conversion, equalization, estimation, nonuni-form sampling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-46128 (URN)10.1109/TSP.2005.843706 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2004). Blind Adaptive Equalization of Mismatch Errors in Time Interleaved A/D Converter System. IEEE Transactions on Circuits And Systems Part I: Fundamental Theory and Applications, 51(1), 151-158
Open this publication in new window or tab >>Blind Adaptive Equalization of Mismatch Errors in Time Interleaved A/D Converter System
2004 (English)In: IEEE Transactions on Circuits And Systems Part I: Fundamental Theory and Applications, ISSN 1057-7122, E-ISSN 1558-1268, Vol. 51, no 1, p. 151-158Article in journal (Refereed) Published
Abstract [en]

To significantly increase the sampling rate of an AID converter (ADC), a time-interleaved ADC system is a good option. The drawback of a time-interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain, and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal. In this paper, we present a method for estimation and compensation of the mismatch errors. The estimation method requires no knowledge about the input signal except that it should be bandlimited to the Nyquist frequency for the complete ADC system. This means that the errors can be estimated while the ADC is running. The method is also adaptive to slow changes in the mismatch errors. The estimation method has been validated with simulations and measurements from a time-interleaved ADC system.

Keyword
A/D conversion, Equalization, Estimation, Nonuniform sampling
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-46263 (URN)10.1109/TCSI.2003.821300 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2003). Analysis of Mismatch Effects in Randomly Interleaved A/D Converter System. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Analysis of Mismatch Effects in Randomly Interleaved A/D Converter System
2003 (English)Report (Other academic)
Abstract [en]

To significantly increase the sampling rate of an A/D converter (ADC), a time interleaved ADC system is a good option. The drawback of a time interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain and offset mismatch errors are introduced in the ADC system. These errors cause non harmonic distortion in the sampled signal. One way to decrease the impact of the mismatch errors is to spread the distortion over a wider frequency range by randomizing the order in which the ADCs are used in the interleaved structure. In this paper we analyze how the spectrum is affected by mismatch errors in a randomly interleaved ADC system. We also discuss how the mismatch errors can be estimated.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003. p. 14
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2496
Keyword
A/D conversion, Nonuniform sampling, Random sampling
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55913 (URN)LiTH-ISY-R-2496 (ISRN)
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-07-29Bibliographically approved
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2003). Analysis of Mismatch Noise in Randomly Interleaved ADC Systems. In: Proceedings of the 2003 IEEE International Conference on Acoustics, Speech and Signal Processing: . Paper presented at 2003 IEEE International Conference on Acoustics, Speech and Signal Processing, Hong Kong, China, April, 2003 (pp. 277-280 vol.6).
Open this publication in new window or tab >>Analysis of Mismatch Noise in Randomly Interleaved ADC Systems
2003 (English)In: Proceedings of the 2003 IEEE International Conference on Acoustics, Speech and Signal Processing, 2003, p. 277-280 vol.6Conference paper, Published paper (Refereed)
Abstract [en]

Time interleaved A/D converters (ADC) can be used to increase the sample rate of an ADC system. However, a problem with time interleaved ADC is that distortion is introduced in the output signal due to various mismatch errors between the ADC. One way to decrease the impact of the mismatch errors is to introduce additional ADC in the interleaved structure and randomly select an ADC at each sample instance. The periodicity of the errors is then removed and the spurious distortion is changed to a more noiselike distortion, spread over the whole spectrum. In this paper, a probabilistic model of the randomly interleaved ADC system is presented. The noise spectrum caused by gain errors is also analyzed.

Keyword
A/D converter, Signal sampling, Analogue-digital conversion, Spectral analysis
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-90303 (URN)10.1109/ICASSP.2003.1201672 (DOI)0-7803-7663-3 (ISBN)
Conference
2003 IEEE International Conference on Acoustics, Speech and Signal Processing, Hong Kong, China, April, 2003
Available from: 2013-03-29 Created: 2013-03-24 Last updated: 2013-08-29
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2003). Blind Adaptive Equalization of Mismatch Errors in Time Interleaved A/D Converter System. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Blind Adaptive Equalization of Mismatch Errors in Time Interleaved A/D Converter System
2003 (English)Report (Other academic)
Abstract [en]

To significantly increase the sampling rate of an AID converter (ADC), a time-interleaved ADC system is a good option. The drawback of a time-interleaved ADC system is that the ADCs are not exactly identical due to errors in the manufacturing process. This means that time, gain, and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal. In this paper, we present a method for estimation and compensation of the mismatch errors. The estimation method requires no knowledge about the input signal except that it should be bandlimited to the Nyquist frequency for the complete ADC system. This means that the errors can be estimated while the ADC is running. The method is also adaptive to slow changes in the mismatch errors. The estimation method has been validated with simulations and measurements from a time-interleaved ADC system.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003. p. 13
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2486
Keyword
A/D conversion, Nonuniform sampling, Equalization, Estimation
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55905 (URN)LiTH-ISY-R-2486 (ISRN)
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-07-29Bibliographically approved
Elbornsson, J. & Gustafsson, F. (2003). Equalization of Time Errors in Time Interleaved ADC System - Part I: Theory. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Equalization of Time Errors in Time Interleaved ADC System - Part I: Theory
2003 (English)Report (Other academic)
Abstract [en]

To significantly increase the sampling rate of an A/D converter (ADC), a time interleaved ADC system is a good option. The drawback of a time interleaved ADC system is that the ADCs are not exactly identical dueto errors in the manufacturing process. This means that time, gain and offset mismatch errors are introduced in the ADC system. These errors cause distortion in the sampled signal. In this paper we present a method for estimation and compensation of the time mismatch errors. The estimation method requires no knowledge about the input signal except that it should be band limited to the Nyquist frequency for the complete ADC system. This means that the errors can be estimated whilethe ADC is running. The method is also adaptive to slow changes in the time errors.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2494
Keyword
A/D conversion, Nonuniform sampling, Equalization, Estimation
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55911 (URN)
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2013-10-09
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2003). Equalization of Time Errors in Time Interleaved ADC System - Part II: Analysis and Examples. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Equalization of Time Errors in Time Interleaved ADC System - Part II: Analysis and Examples
2003 (English)Report (Other academic)
Abstract [en]

In the accompanying paper a method for blind (i.e., no calibration needed) estimation and compensation of the time errors in a time interleaved ADC system was presented. In this paper we evaluate this method. The Cramer-Rao bound is calculated, both for additive noise and random clock jitter. Monte-Carlo simulations have also been done to compare to the CRB. Finally, the estimation method is validated on measurements from areal time interleaved ADC system with 16 ADCs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003. p. 11
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2495
Keyword
A/D conversion, Nonuniform sampling, Equalization, Estimation
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-55912 (URN)LiTH-ISY-R-2495 (ISRN)
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-07-29Bibliographically approved
Andersson, M., Elbornsson, J., Eklund, J.-E., Alvbrant, J. & Fredriksson, H. (2003). Verification of a blind mismatch error equalization method for randomly interleaved ADCs using 2.5V/12/30MSs PSAADC.. In: ESSCIRC 2003,2003 (pp. 473). Lissabon: Grafica Maiadouro SA
Open this publication in new window or tab >>Verification of a blind mismatch error equalization method for randomly interleaved ADCs using 2.5V/12/30MSs PSAADC.
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2003 (English)In: ESSCIRC 2003,2003, Lissabon: Grafica Maiadouro SA , 2003, p. 473-Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lissabon: Grafica Maiadouro SA, 2003
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-34761 (URN)23135 (Local ID)23135 (Archive number)23135 (OAI)
Available from: 2009-10-10 Created: 2009-10-10
Elbornsson, J., Gustafsson, F. & Eklund, J.-E. (2002). Amplitude and Gain Error Influence on Time Error Estimation Algorithm for Time Interleaved A/D Converter System. In: Proceedings of the 2002 IEEE International Conference on Acoustics, Speech and Signal Processing: . Paper presented at 2002 IEEE International Conference on Acoustics, Speech and Signal Processing, Orlando, FL, USA May, 2002 (pp. 1281).
Open this publication in new window or tab >>Amplitude and Gain Error Influence on Time Error Estimation Algorithm for Time Interleaved A/D Converter System
2002 (English)In: Proceedings of the 2002 IEEE International Conference on Acoustics, Speech and Signal Processing, 2002, p. 1281-Conference paper, Published paper (Refereed)
Abstract [en]

A method for blind estimation of static time errors in time interleaved A/D converters is investigated. The method assumes tha tamplitude and gain errors are removed before the time error estimation. Even if the amplitude and gain errors are estimated and removed, there will be small errors left. In this paper, we investigate how the amplitude and gain errors influence the time error estimation performance.

Keyword
Sampling, A/D conversion, Estimation
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-34845 (URN)10.1109/ICASSP.2002.5744036 (DOI)23637 (Local ID)0-7803-7402-9 (ISBN)23637 (Archive number)23637 (OAI)
Conference
2002 IEEE International Conference on Acoustics, Speech and Signal Processing, Orlando, FL, USA May, 2002
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2018-03-08
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