Electrothermal Simulation in a Concurrent Waveform Relaxation Based Circuit Simulator
(1998) In Series of licentiate and doctoral theses / Department of Applied Electronics, Lund University 5. Abstract
 The main purpose of this work is to study methods to simulate <i>electrothermal effects</i> in integrated circuits using CONCISE a <i>waveform relaxation</i> based circuit simulator. WR is a method that is suitable to run on a multicomputer with state of the art computing power. Especially CMOS VLSI circuits have been simulated successfully with WR. With simulation experiments we have shown that it is possible to use WR methods to simulate the electrothermal couplings that are present in integrated circuits. The approach we have used for modeling the electrothermal couplings is general and can be used in standard circuit simulators, such as SPICE.
One contribution is the <i>augmented... (More)  The main purpose of this work is to study methods to simulate <i>electrothermal effects</i> in integrated circuits using CONCISE a <i>waveform relaxation</i> based circuit simulator. WR is a method that is suitable to run on a multicomputer with state of the art computing power. Especially CMOS VLSI circuits have been simulated successfully with WR. With simulation experiments we have shown that it is possible to use WR methods to simulate the electrothermal couplings that are present in integrated circuits. The approach we have used for modeling the electrothermal couplings is general and can be used in standard circuit simulators, such as SPICE.
One contribution is the <i>augmented transistor modeling approach</i>. The idea is to have an augmented transistor model that adds thermal behavior to the builtin transistor model. This is especially useful in the design of electronic circuits when we consider dynamic thermal effects using existing transistor models which typically only consider the temperature as a constant parameter. The augmented transistor model enables the user to model both the thermal network and its dynamic couplings to the electrical network.
Principles of <i>thermal network modeling</i> are also presented to help the reader understand the couplings between the electrical and the thermal domains. Physical thermal relations are transformed into electrical analogies suitable for simulation by a circuit simulator. The result is an approach intended for modeling of multidimensional thermal networks.
For the synthesis of compact models of the multidimensional thermal network we have found it practical to use <i>bond graphs</i> to illustrate the derivation steps.
Another purpose of this work is to simplify the task of writing <i>functional models</i> in CONCISE; our inhouse circuit simulator. The proposed method of incorporating functional elements into a bond graph relies on an analogy between the numerical <i>solver</i> and the circuit primitive <i>norator</i>. We have extended the bond graph language with nullator and norator elements, which are frequently used in circuit theory. With these new bond graph primitives we have shown that it is possible to start with a design equation and synthesize an electrical circuit. We have specifically investigated the synthesis of a translinear circuit. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/18897
 author
 Wiklund, Magnus ^{LU}
 supervisor
 opponent

 Prof. Székely, Vladimír
 organization
 publishing date
 1998
 type
 Thesis
 publication status
 published
 subject
 keywords
 Circuit synthesis, Bond graphs, Nullor, Circuit theory, Analog simulation, Circuit simulation, Multiprocessor computer, CONCISE, Parallel computation, Waveform relaxation, Thermal models, Transistor models, Electrothermal simulation, Electrothermal modeling, Translinear circuits, Electronics, Elektronik, Electrical engineering, Elektroteknik
 in
 Series of licentiate and doctoral theses / Department of Applied Electronics, Lund University
 volume
 5
 pages
 226 pages
 publisher
 Department of Applied Electronics, Lund University,
 defense location
 E:1406, Ehuset, Lunds Tekniska Högskola
 defense date
 19980612 10:00:00
 ISSN
 14028662
 language
 English
 LU publication?
 yes
 id
 592d8191a17442a9b8cc81217885ea13 (old id 18897)
 date added to LUP
 20160401 16:30:56
 date last changed
 20190524 08:02:47
@phdthesis{592d8191a17442a9b8cc81217885ea13, abstract = {{The main purpose of this work is to study methods to simulate <i>electrothermal effects</i> in integrated circuits using CONCISE a <i>waveform relaxation</i> based circuit simulator. WR is a method that is suitable to run on a multicomputer with state of the art computing power. Especially CMOS VLSI circuits have been simulated successfully with WR. With simulation experiments we have shown that it is possible to use WR methods to simulate the electrothermal couplings that are present in integrated circuits. The approach we have used for modeling the electrothermal couplings is general and can be used in standard circuit simulators, such as SPICE.<br/><br> <br/><br> One contribution is the <i>augmented transistor modeling approach</i>. The idea is to have an augmented transistor model that adds thermal behavior to the builtin transistor model. This is especially useful in the design of electronic circuits when we consider dynamic thermal effects using existing transistor models which typically only consider the temperature as a constant parameter. The augmented transistor model enables the user to model both the thermal network and its dynamic couplings to the electrical network.<br/><br> <br/><br> Principles of <i>thermal network modeling</i> are also presented to help the reader understand the couplings between the electrical and the thermal domains. Physical thermal relations are transformed into electrical analogies suitable for simulation by a circuit simulator. The result is an approach intended for modeling of multidimensional thermal networks.<br/><br> <br/><br> For the synthesis of compact models of the multidimensional thermal network we have found it practical to use <i>bond graphs</i> to illustrate the derivation steps.<br/><br> <br/><br> Another purpose of this work is to simplify the task of writing <i>functional models</i> in CONCISE; our inhouse circuit simulator. The proposed method of incorporating functional elements into a bond graph relies on an analogy between the numerical <i>solver</i> and the circuit primitive <i>norator</i>. We have extended the bond graph language with nullator and norator elements, which are frequently used in circuit theory. With these new bond graph primitives we have shown that it is possible to start with a design equation and synthesize an electrical circuit. We have specifically investigated the synthesis of a translinear circuit.}}, author = {{Wiklund, Magnus}}, issn = {{14028662}}, keywords = {{Circuit synthesis; Bond graphs; Nullor; Circuit theory; Analog simulation; Circuit simulation; Multiprocessor computer; CONCISE; Parallel computation; Waveform relaxation; Thermal models; Transistor models; Electrothermal simulation; Electrothermal modeling; Translinear circuits; Electronics; Elektronik; Electrical engineering; Elektroteknik}}, language = {{eng}}, publisher = {{Department of Applied Electronics, Lund University,}}, school = {{Lund University}}, series = {{Series of licentiate and doctoral theses / Department of Applied Electronics, Lund University}}, title = {{Electrothermal Simulation in a Concurrent Waveform Relaxation Based Circuit Simulator}}, volume = {{5}}, year = {{1998}}, }