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1

Recent developments in Qucs-s Equation-Defined modelling of semiconductor devices and IC’s

Brinson M., Kuznetsov V.

International Journal of Microelectronics and Computer Science

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2017

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Vol. 8, nr 1

29--35

EN

The Qucs Equation-Defined Device was introduce roughly ten years ago as a versatile behavioural simulation component for modelling the non-linear static and dynamic properties of passive components, semiconductor devices and IC macromodels. Today, this component has become an established element for building experimental device simulation models. It’s inherent interactive properties make it ideal for device and circuit modelling via Qucs schematics. Moreover, Equation-Defined Devices often promote a clearer understanding of the factors involved in the construction of complex compact semiconductor simulation models. This paper is concerned with recent advances in Qucs-S/Ngspice/XSPICE modelling capabilities that improve model construction and simulation run time performance of Equation-Defined Devices using XSPICE model syntheses. To illustrate the new Qucs-S modelling techniques an XSPICE version of the EPFL EKV v2.6 long channel transistor model together with other illustrative examples are described and their performance simulated with Qucs-S and Ngspice.

2

Current conveyor equation-defined macromodels for wideband RF circuit design

Brinson M., Kuznetsov V.

International Journal of Microelectronics and Computer Science

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2017

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Vol. 8, nr 2

65--71

EN

A high percentage of analogue integrated circuit designs use voltage domain signal processing techniques. Given the fact that integrated circuit current conveyors are high bandwidth current processing devices, often with superior RF performance compared to comparable voltage domain devices, it is surprising that the number of current mode integrated circuits available, as standard of-the-shelf industrial items, is so small. This paper introduces equation-defined device and Verilog-A synthesis approaches to the macromodelling of current conveyor integrated circuits. To illustrate the proposed modelling techniques the properties of a number of modular behavioural level current conveyor macromodel cells are described and their performance compared. The material presented is intended for analogue device modellers and circuit designers who wish to simulate large signal current domain integrated circuit designs. It also demonstrates how synthesized Verilog-A modules can be derived from equation-defined device and conventional subcircuits to form functional, computationally efficient current conveyor macromodels. To illustrate the application of behavioural current conveyor macromodels the design of a six cell CCII+ instrumentation amplifier is introduced and its performance discussed.

3

Macro models of casualties in road transport

Jamroz K.

Journal of KONBiN

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2012

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No. 3 (23)

71--82

EN

To ensure that road transport safety measures are effective and efficient, forecast tools should be applied to help with strategic decision-making. Models of road safety measures provide such tools. The paper presents a proposed macro model of road accident casualties. The proposed models of road accident fatalities are built from a database covering more than fifty countries worldwide. The concepts of model design can be used for developing factor-based models to describe strategic societal risk on the road networks of selected countries worldwide. One of the concepts was applied to model the number of road accident fatalities. The analyses used Smeed’s model and its modifications developed for the needs of this analysis.

PL

Wybór i prowadzenie skutecznych i efektywnych działań na rzecz bezpieczeństwa transportu drogowego wymaga opracowania narzędzi prognostycznych ułatwiających podejmowanie decyzji strategicznych. Takimi narzędziami są modele miar bezpieczeństwa ruchu drogowego. W referacie przedstawiono propozycję makro modelu strat osobowych ponoszonych w wypadkach drogowych. Zaproponowano modele liczby ofiar śmiertelnych wypadków drogowych zbudowanego na bazie danych z kilkudziesięciu krajów całego świata. Przedstawione koncepcje budowy modeli mogą posłużyć do opracowania modeli czynnikowych opisujących strategiczne ryzyko społeczne na sieci dróg wybranych krajów z całego świata. Jedną z koncepcji aplikowano do modelowania liczby ofiar śmiertelnych wypadków drogowych. Do analiz przyjęto model Smeed’a i jego modyfikacje opracowane dla potrzeb przedstawionej analizy.

4

Model of pure metal solidification using the power-type function

Mochnacki B., Szopa R.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 22, nr 1

65-68

EN

Purpose: The typical mathematical descriptions of pure metal solidification (micro/macro approach) base on the linear or exponential (Kolmogoroff) models. In the paper the possibilities of such models modification are presented. This new model can be called a power type one. The approach proposed can be usefull on the stage of numerical simulation of solidification on the micro/macro scale. Design/methodology/approach: The local and temporary volumetric fraction of solid state is described by the equation from which both the linear and exponential model can be obtained. Introducing the additional parameter to this equation the new solidification model is found. Findings: The method here presented allows to determine the transient temperature field in a non-homogeneous system casting-mould and to observe the course of metal solidification. The obtained cooling curves allow to observe (contrary to macro models) the recalescence effect. Practical implications: The solidification model in a version presented in this paper can be an effective tool for numerical simulation of solidification process. Originality/value: The concept of introduction of power-type function for the mathematical description of micro/macro solidification model is original and gives the new possibilities numerical methods application in a thermal theory of foundry processes.