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Romuald Masnicki, Janusz Mindykowski
THE EXAMINATION OF UNCERTAINTY DESIGNATION ALGORITHMS DEDICATED TO APPLY IN THE MEASUREMENT CHANNEL EQUIPPED WITH ADC

In this paper the idea and the selected results of numerical simulation of an uncertainty designation procedure in the measurement channel equipped with ADC is presented. The basic principles of that procedure implementation are shown in literature. The assessment of correctness of the mentioned procedures is the main aim of the carried out simulations.

M. Caciotta, F. Leccese, A. Trifirò
FREQUENCY VALUATION IN CURVE FITTING ALGORITHM

The possibility to use the Curve Fitting Algorithm (CFA), for the Power Quality (PQ) parameters valuation foreseen by the EN 50160 Rule, is faced in terms of frequency determination. The comparison between the loop algorithm performance in the frequency determination and the thrown one, using a Taylor Series, truncated in terms of foreseen uncertainty, is presented.

Niclas Björsell, Peter Händel
DYNAMIC BEHAVIOR MODELS OF ANALOG TO DIGITAL CONVERTERS AIMED FOR POST-CORRECTION IN WIDEBAND APPLICATIONS

In this paper a dynamic behavior model of analog to digital converters is proposed. The model is aimed for post correction in wideband applications. The suggested post correction method is a combination of look up tables and model based correction.
The model consists of three components. The first is a component represented by a Hammerstein model; that is a static nonlinearity followed by a time invariant linear filter. The second component is a nonparametric model caused by significant deviation from the characterized integral nonlinearity and the output from the Hammerstein model. The third component contains of the remaining deviation and is considered as a random model error.
Results from simulations verify that the examined ADC can be described by an ordinary Hammerstein model and a static look-up table.

L. Michaeli, L. Sochová, J. Šaliga
ADC LOOK-UP TABLE BASED POST CORRECTION COMBINED WITH DITHERING

The main purpose of this paper is to present the external correction of analog to digital converters (ADC) integral nonlinearity and quantization noise based on the look up table method combined with the averaging filter and dithering method. The low code frequency component of integral nonlinearity (LCFINL) is reduced by the error table of the look up table method, the high frequency part (HCFINL) by sine wave dithering signal mainly.

Jan Neškudla, Josef Vedral
DIGITALY CONTROLLED WHITE NOISE GENERATOR

This paper demonstrates a new method of digital generation of white noise signal with given statistical distribution. Digital pseudo-random number generator based on LFSR and a single-bit Digital/Analogue converter are used. The objective of this exploration is a testing device usable to measure parameters of Analogue/Digital converters using Step- Gauss test method. Also new theoretically possible way of generating uniformly distributed noise signal is shown.

Martin Novotný, Miloš Sedláček
INFLUENCE OF QUANTIZATION NOISE ON DFT–BASED DSP ALGORITHMS

This paper deals with analysis of influence of quantization noise on estimation of parameters of signal gained by various algorithms based on Discrete Fourier Transform (DFT) for the case of coherent and non–coherent sampling. Theoretical analysis, numerical simulation results and experimental validation are presented. The analyzed methods are compared from the point of view of their sensitivity to quantization noise.

Henrik Lundin, Peter Händel, Mikael Skoglund
ACCURATE PREDICTION OF ANALOG-TO-DIGITAL CONVERTER

Analog-to-digital converter additive postcorrection using look-up-tables is considered. An accurate expression is provided that predicts the ADC performance after correction. The expression depends on differential nonlinearity, random noise variance, and the numerical precision of the correction terms. The theory shows good agreement when compared with simulations and experimental converter data.

Ondřej Šubrt, Pravoslav Martinek, Carsten Wegener
DEVELOPING MODEL-BASED DESIGN EVALUATION FOR ALGORITHMIC A/D CONVERTERS

In this paper we propose a novel Design Evaluation concept suitable for Nyquist-rate A/D converters employing the recently introduced technique of LEMMA (Linear Error Mechanism Modeling Algorithm). The core of our methodology is a root-cause identification of the error sources present in the ADC structure, evaluating the performance degradation by static non-linearity in a series of consecutive steps. Our solution benefits a wide scale of design optimization and device calibration possibilities, as it is demonstrated on a design example of Switched-Current (SI) algorithmic ADC. The results introduced in this paper are proven by full-transistor level and behavioral ADC simulation, back-annotating the parameters of its basic circuit element (SI memory cell) from the measurement of available silicon samples.

David Slepička, Dominique Dallet, Vladimir Shitikov, François Barbara
ADC CHARACTERIZATION IN THE FREQUENCY DOMAIN BY DUAL TONE TESTING

The main goal of this paper is to characterize the low-frequency part of ADC transfer function by dual tone testing from intermodulation components that are independent of test signal harmonic distortion. The theoretical analyses of incoherently sampled signals in the frequency domain and of intermodulation distortion are provided and the theory is verified by experimental results.

Milan Komarek, Vaclav Papez, Jaroslav Roztocil, Petr Suchanek
SINE-WAVE SIGNAL SOURCES FOR DYNAMIC TESTING HIGH-RESOLUTION HIGH-SPEED ADCs

The paper deals with methods of a sine-wave signal generation for dynamic testing high-speed (1 MSa/s to 100 MSa/s) ADCs with high resolution (14 to 20 bits). The techniques of noise and distortion measurement of spectrally-pure sine-wave signals are also discussed.

Page 833 of 936 Results 8321 - 8330 of 9356