Circuit Simulator Based Methods

2003 ◽  
pp. 72-120
Author(s):  
Peter S. Hall ◽  
Vincent F. Fusco ◽  
Martin J. Cryan
Keyword(s):  
Circuit Simulator

Compact Modelling of Electrical, Mechanical and Thermal Behaviour for MEMS with SPICE

2008 ◽  
Vol 1083 ◽  
Author(s):  
Andreas Frank ◽  
J.-P. Zoellner ◽  
Y. Sarov ◽  
Tz. Ivanov ◽  
I. Kuhnholz ◽  
...  
Keyword(s):  
Thermal Behaviour ◽  
Fem Simulation ◽  
Electrical Circuit ◽  
System Level ◽  
Equivalent Circuits ◽  
Macro Model ◽  
Circuit Simulator ◽  
Lumped Elements ◽  
Cantilever Array ◽  
Novel Method

ABSTRACTIn this paper we present a novel method of nonlinear macro model of a cantilever for mixed domain simulation only with SPICE. Based on lumped elements of equivalent circuits a model is developed, which realizes a coupled electro-thermal-mechanical simulation including crosstalk effects. The model is verified with measurement and helps to class and solve crosstalk. With SPICE as electrical circuit simulator the cantilever array could be simulate in conjunction with the excitations and analysis electronics more detailed like the system level models and faster like FEM-simulation.

Extending the Ohtomo Stability Test to Large-Signal Solutions in a Commercial Circuit Simulator

2021 ◽  
pp. 1-1
Author(s):  
Sergio Colangeli ◽  
Walter Ciccognani ◽  
Patrick E. Longhi ◽  
Leonardo Pantoli ◽  
Giorgio Leuzzi ◽  
...  
Keyword(s):  
Stability Test ◽  
Large Signal ◽  
Circuit Simulator

Equivalent Circuit of the Concentration Transport in a Fluidic Channel

2016 ◽  
Author(s):  
U. Marschner ◽  
J. Páez Chávez ◽  
A. Voigt ◽  
Andreas Richter
Keyword(s):  
Transport Equation ◽  
Equivalent Circuit ◽  
Grid Point ◽  
Method Of Lines ◽  
Transient Behavior ◽  
Electrical Network ◽  
Chemical Solution ◽  
Microfluidic Systems ◽  
Fluidic Channel ◽  
Circuit Simulator

A new equivalent circuit is presented, which describes the transport of a chemical solution with a certain concentration in a fluidic channel. Channels are basic parts of a microfluidic systems and the concentration of the chemical solution can control the opening and closing of valves based on smart hydrogels. This type of microfluidic systems facilitates the autonomous control of fluid flow, e.g. in chemo-fluidic oscillators. Through this channel, the solution is transported at a velocity determined by the flow rate through the channel and its cross section. While the volumetric flow is not delayed in an ideal channel, the channel acts as delay line for the particles and thus for a certain concentration transport through the channel. In this setting, the transport of the dissolved chemical by water traveling along the delay channel can be described by the one-dimensional transport equation. In order to derive the equivalent circuit, the transport equation is numerically approximated based on the well-known Method of Lines. This method consists in approximating the original PDE via a large system of ODEs. The ODEs are obtained by discretizing the PDE in space, in such a way that each component of the resulting system of ODEs approximates the solution of the PDE at some grid point along the spatial interval. Once the system of ODEs has been constructed, a flow and a difference quantity can be defined and the ODEs interpreted as finite network elements. Since the equations are isomorphic to electrical ODEs of electrical network elements, the fluidic channel can be expressed by an equivalent circuit. Thus the transient behavior of the transport mechanism can be calculated using a circuit simulator as part of a design automation. Simulation results are presented.

scholarly journals Development of an Electrothermal Simulation Tool for Integrated Circuits

2021 ◽  
Author(s):  
Sara Sharifian Attar
Keyword(s):  
Steady State ◽  
Integrated Circuits ◽  
Thermal Modeling ◽  
Experimental Results ◽  
Junction Temperature ◽  
Collector Current ◽  
Bipolar Junction Transistor ◽  
Circuit Simulator ◽  
Junction Transistor ◽  
Electrothermal Simulation

The goal of this research was to develop a capability for the electrothermal modeling of electronic circuits. The objective of the thermal modeling process was to create a model that represents the thermal behavior of the physical system. The project focuses on electrothermal analysis at devices and chip level. A novel method to perform electrothermal analysis of integrated circuits based on the relaxation approach is proposed in this research. An interface program couples a circuit simulator and a thermal simulator. The developed simulator is capable of performing both steady state and transient analaysis at devices and chip level. The proposed method was applied to perform electrothermal analysis of Silicon Bipolar Junction Transistor (BJT) to predict the temperature distribution and the device performance in a circuit. Thermal nonlinearity due to temperature-dependent material parameters in the context of thermal modeling of the device and circuit has also been considered. The DC characteristics of the device were investigated. The obtained results indicate that the operating point of the device varies while the device reaches its junction temperature. The accuracy of the electrothermal simulator has been evaluated for steady state analysis. The experimental results of a BJT amplifier were compared to the simulator results of the similar circuit. The electrothermal simulation results of BJT amplifier circuit indicate a good agreement with the available experimental results in terms of power dissipation, collector current and base-emitter voltage. The performance of the electrothermal simulator has been evaluated for tansient analysis. A current mirror circuit using Si NPN BJTs was simulated. According to the electrical simulator, the output current follows the reference current immediately. Nonetheless, the electrothermal simulator results depict that the load current has delay to reach a constant value which is not the same as the reference current, due to the influence of thermal coupling and self heating. The obtained results are in agreement with the available results in literature.

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