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Relevance of using single-tone tests to characterize ADCs for ADSL modems
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Microelectronics Research Center, Ericsson Microelectronics AB, Linköpings, Sweden.
2002 (English)In: Proceedings of the 20th Norchip Conference, 2002, Copenhagen: TechnoData A/S , 2002, 214-219 p.Conference paper, Published paper (Refereed)
Abstract [en]

The ADC in ADSL modems is chosen to meet a requirement of an effective number of bits. To find the effective number of bits of an ADC, a single-tone test is used. Since an ADSL application is very different from the single-tone, it is not certain that this is suitable method. A detailed ADC model has been included in a MATLAB model of an ADSL link and simulations have been made to investigate the relevance of single-tone characterization of ADCs for ADSL applications.

Place, publisher, year, edition, pages
Copenhagen: TechnoData A/S , 2002. 214-219 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-34848Local ID: 23652OAI: oai:DiVA.org:liu-34848DiVA: diva2:255696
Conference
20th IEEE NORCHIP Conference, Copenhagen, Denmark, November 11-12, 2002
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-12-19
In thesis
1. ADC modeling for system simulation
Open this publication in new window or tab >>ADC modeling for system simulation
2003 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Modem system design methods are based on early system simulation using behavioral models. Since the ADC often is the critical component it is especially important that it is mode led correctly. Most current design environments use very simple ADC models such as ideal sampling and quantization to give a certain effective number of bits (ENOB). The ENOB is typically found by a single-tone test where the input is an amplitude-limited sine wave. Real applications may have inputs very different from this simple test signal and the ADC can then have a completely different performance. Detailed knowledge of the behavior in a system allows the ADC design margin to be minimized thus saving cost and power consumption.

ln the work included in this thesis an accurate model of a successive-approximation ADC is developed. It is aimed for integration into existing system simulators and can thus not be too complex or the simulation time will be unreasonably long. Measurements are performed to validate the model andcomparisons between simulated and measured data are done in both time and frequency domains. This is used to test some error hypotheses in order to find the performance limiting errors of the successive-approximation architecture.

Further, the need for accurate ADC models in system simulation is investigated. A complex model is of no use if the same information can be obtained with a simple one. To do this, the ADC model is integrated in two different systems: an ADSL modem and a radar receiver. System simulations are performed and the results are compared to the case when a simple ADC model is used. In both cases the accurate ADC model showed to be useful. System performance varied quite much for ADCs with the same specified performance in terms of ENOB depending on which error mechanism was active.

Place, publisher, year, edition, pages
Linköping: Linköping studies in science and technology, 2003. 42 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1027
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-34806 (URN)23304 (Local ID)91-7373-689-9 (ISBN)23304 (Archive number)23304 (OAI)
Presentation
2003-06-19, Sal Glashuset, Linköpings universitet, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-12-19

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Folkesson, KalleSvensson, Christer

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Output format
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