| 1. |
- Händel, Peter, 1962-, et al.
(författare)
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Model Based Dynamic Characterization of Analog-Digital-Converters at Radio Frequency
- 2007
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Ingår i: 2007 9th International Symposium on Signal Processing and its Applications, Vol. 1-3. - 9781424407781 ; , s. 1403-1408
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Konferensbidrag (refereegranskat)abstract
- A dynamic characterization of analog-digital converter integral nonlinearity (INL) is considered. When using a plurality of test frequencies in the measurement set-up, the dynamic errors of the converter are characterized. The INL is modeled by low and high code components - LCF and HCF, respectively. The LCF and HCF are parameterized and a least squares method is derived for the estimation of the parameter values from obtained measurements. A closed form solution to the estimation problem is derived and its performance is illustrated by a numerical example. The proposed method is believed to be fruitful in wide-band characterization of analog-digital converters at radio frequency, and thus of importance for the evaluation of modem and future wireless communication systems.
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| 2. |
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| 3. |
- Medawar, Samer, et al.
(författare)
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ADC Characterization By Dynamic Integral Nonlinearity
- 2008
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Ingår i: 13th Workshop on ADC Modelling and Testing. - 9788890314933 ; , s. 1037-1042
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Konferensbidrag (refereegranskat)abstract
- Wide band characterization of analog-digital converter integral nonlinearity (INL) based on parametric modeling and least-squares parameter fit is performed. In particular, the variations in the INL due to the frequency of theADC stimuli are modeled. The INL is divided into two main entities describing the static and dynamic behavior of theADC, respectively. The static component is modeled by a high code component (HCF) of piecewise linear segmentscentered around zero. A static low code (LCF) polynomial inherent to the INL data is added to the segments to complete the static part of the model. The INL dynamic part is modeled by an LCF polynomial. Method implementationis considered and is applied to 12-bit ADC data at 210 MSPS.
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| 4. |
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| 5. |
- Medawar, Samer, et al.
(författare)
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Dynamic Characterization of Analog-Digital-Converters Non-Linearities
- 2007
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Ingår i: <em>Proceedings Mosharaka International Conference on Wireless Communications and Mobile Computing</em>.
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Konferensbidrag (refereegranskat)abstract
- A characterization of a state of the art pipeline ADC is presented. Measurements are performed on a wide set of frequencies. The integral non linearity (INL) is modeled by high code and low code components, HCF and LCF. The HCF component is to be deprived of any dynamic behavior, and varies piecewise linearly in certain intervals. Hence, the LCF represents the dynamic behavior that should varies the frequency of the test signal. Employement of the method presented in [1] on measured data is performed and complemented with modifications stimulated by the behavior of measured data.
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| 6. |
- Voltaire, Joakim, et al.
(författare)
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Acoustic investigation of cavitation noise from offset ink film splitting
- 2006
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Ingår i: Nordic Pulp & Paper Research Journal. - : Walter de Gruyter GmbH. - 0283-2631 .- 2000-0669. ; 21:3, s. 314-322
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Tidskriftsartikel (refereegranskat)abstract
- The acoustic signal from the nip during film splitting between inked rollers and on ink transfer to paper was investigated on laboratory scale, using two sheet-fed offset inks (based on mineral oil and vegetable oil) and two coated fine papers (glossy and matte). Film splitting emits a broad noise-like acoustic spectrum in the range 5-50 kHz, from which the two simplest measures of average power and average frequency were derived. Using these two measures, four characteristic regimes of film splitting on the rollers could be distinguished as a function of ink load. Moreover, for intermediate amounts, average power was found to be accurately predicted by a simplistic model of sound produced by cavity expansion due to the under-pressure in the nip exit, thus providing a physical interpretation of the nip noise emission. For printing, the average power was higher for the glossy paper than the matte, presumably due to a more efficient sealing of the nip, or onset of ink setting. The vegetable oil-based ink gave higher power than its mineral oil counterpart. These results were found to be consistent with longer-time measurements of tack evolution from the Ink Surface Interaction Tester. This correlation and the verified theory thus provide support to practical applications of acoustic emission as an on-press monitoring tool.
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