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1

Frequency domain non-linear compact modelling and simulation of IC spiral inductors on silicon

Brinson Mike

International Journal of Microelectronics and Computer Science

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2018

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Vol. 9, nr 1

13--26

EN

SPICE AC circuit simulation is fundamentally a small signal network analysis of a linear or non-linear circuit operating at specified DC bias conditions, where the electrical network component values are assumed not to be functions of AC input signal frequency. In the case of RF circuit simulation this assumption can give rise to significant modelling errors. With the recent improvements in General Public License (GPL) circuit simulators this situation is changing, particularly through the introduction of Frequency Dependent Equation-Defined Device (FEDD) models, non-linear current/voltage static and dynamic Equation-Defined Device (EDD) models and user controlled swept signal frequency simulation employing Harmonic Balance steady state analysis. The main purpose of this paper is to introduce a number of novel modelling and circuit simulation techniques that allow, and enhance, the construction of compact device models with embedded behavioural components whose non-linear properties are functions of AC input signal frequency. To demonstrate these new modelling techniques a compact model for a 10 GHz band width spiral inductor integrated on silicon is introduced, its compact model presented, and finally its simulation performance compared with published measured device data.

2

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.

3

Electrochemical measurement of the impeller speed for off-bottom suspension in a dish-bottomed vessel

Jirout T., Moravec J., Rieger F.

Inżynieria Chemiczna i Procesowa

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2006

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T. 27, z. 4

1507-1516

EN

Visual observation of particle layer sediment at the vessel bottom by classical Zwietering's concept is the most known method for determining just-suspended impeller speed. This method has many disadvantages which can be eliminated by new application of the electrochemical method (EDD) for observation of particle layer sediment on the vessel bottom and for identification of just off-bottom particle suspension state. The main goal of this paper is to demonstrate the applicability of an electrochemical method for determining the impeller speed for off-bottom particle suspension in a wide range of suspension concentrations. The results obtained from EDD measurements are compared with the results from visual observations.

PL

Obserwacja wizualna warstwy cząstek osadu na dnie zbiornika oparta na klasycznej koncepcji Zwieteringa jest najbardziej znaną metodą wyznaczania częstości obrotów mieszadła dla unoszenia się cząstek z dna. Metoda ta jednak ma wiele wad, które można wyeliminować, stosując metodę elektrochemiczną (EDD) zarówno do obserwacji warstwy ciała stałego, jak i do oceny momentu, kiedy powstaje zawiesina. Głównym celem tej pracy było wykazanie możliwości zastosowania metody elektrochemicznej do określenia krytycznej wartości częstości obrotów mieszadła w szerokim zakresie stężenia zawiesiny. Wyniki uzyskane metodą EDD porównano z danymi uzyskanymi w obserwacjach wizualnych.