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A toolbox for the ΣΔ modulator design

Wróbel P., Śniatała P., Handkiewicz A.

Przegląd Elektrotechniczny

2016

R. 92, nr 9

84--87

The paper presents a toolbox to support ΣΔ modulators design. The Matlab based tools have been prepared to use at structural level. At this level different structures, with different noise shaping filters can be simulated. Important parameters of the modulators (SNDR, ENOB, FoM) are calculated and can be used as a goal function during the optimization process. The optimization procedure can be easily connected to these tools. The elaborated tools were practically applied in the second order, current mode sigma-delta modulator design.

Artykuł przedstawia toolbox wspomagający projektowanie modulatorów ΣΔ. Proces projektowania obejmuje poziom opisu strukturalnego. Możliwe jest zasymulowanie wybranych struktur modulatorów z różnymi filtrami kształtującymi szum. Opracowane skrypty wyliczają podstawowe parametry charakteryzujące testowane struktury (SNDR, ENOB, FoM). Obliczane funkcje mogą zostać użyte jak funkcje celu w procesie optymalizacji projektowanych modulatorów. Procedura optymalizacyjna w łatwy sposób może zostać dołączona do opracowanego środowiska. W celu ułatwienia obsługi system, opracowano interfejs w środowisku Simlink. Wykorzystanie opracowanych narzędzi, zostało w praktyce zweryfikowane w projekcie prądowego modulatora sigma-delta pracującego w trybie prądowym.

FOMCOM: a MATLAB toolbox for fractional-order system identification and control

Tepljakov A., Petlenkov E., Belikov J.

International Journal of Microelectronics and Computer Science

2011

Vol. 2, nr 2

51-62

FOMCON is a new fractional-order modeling and control toolbox for MATLAB. It offers a set of tools for researchers in the field of fractional-order control. In this paper, we present an overview of the toolbox, motivation for its development and relation to other toolboxes devoted to fractional calculus. We discuss all of the major modules of the FOMCON toolbox as well as relevant mathematical concepts. Three modules are presented. The main module is used for fractional-order system analysis. The identification module allows identifying a fractional system from either time or frequency domain data. The control module focuses on fractional-order FID controller design, tuning and optimization, but also has basic support for design of fractional lead-lag compensators and TID controllers. Finally, a Simulink blockset is presented. It allows more sophisticated modeling tasks to be carried out.

From Continuous to Discrete Models of Linear Repetitive Processes

Gramacki A., Gramacki J., Gałkowski K., Rogers E., Owens D. H.

Archives of Control Sciences

2002

Vol. 12, no. 1/2

151-185

Differential linear repetitive processes are a distinct class of 2D linear systems which pose problems which cannot (except in a few very restrictive special cases) be solved by application for computer aided annalysis and simulation. One such problem area is the construction of accurate numerically well conditioned discrete approximations of the dynamics of differential processes which could, as one example of number of immediate applications areas, from the basis for digital implementation of control laws. In this paper, we undertake a detailed investigation of the critical problems which arise when attempting to construct usefull discrete approximations of the dynamics of differential linear repetitive processes and develop solutions to them. Numerical examples to support the results obtained are also given using a specially developed MATLAB based toolbox.