Computer aided analysis of electric circuits using state-variable techniques.

There are three main tasks that a computer program based on state-variable analysis must perform: 1) formulation of a degenerate system of equations; 2) processing of these equations until they eventually become the state equations; 3) the solution of the state equations. The first task requires the computation of a topological tree and its associated tie-set matrix. This can be done using either matrix or search methods. Degenerate variables can then be eliminated using Pottle's method or the Auxiliary Trees method, which is based on Bashkow's work. The solution of the state equations can be accomplished using: 1) an Adams-Bashforth-Moulton predictor corrector method; 2) a Runge-Kutta method (e.g. England's method); 3) Certaine's method of transition matrices; 4) methods suitable for use with systems containing equations with widely separated time constants, known as Stiff equations (e.g. Gear's method). It was found that the formulation of the degenerate system of equations was relatively easy to program, but the elimination of degenerate variables from the main system of equations proved more difficult to program. Additionally, the solution of the state equations gave rise to problems that were sometimes difficult to diagnose. Apart from one problem that could not be resolved using Certaine's method, all test networks containing capacitors, resistors, inductors and independent sources were solved. However, test circuits containing linearly-controlled sources failed without exception when a row of the augmented matrix contained all negative elements - this gave rise to transient responses of the right shape, but grossly distorted in magnitude. Program FOFSVM5 was based on Bashkow's topological formulation of the state equations and uses the Auxiliary Tree method of eliminating the degenerate variables from the main system of equations. It is hoped that FOFSVM5 can be used to investigate integrated circuits in future, subject to various improvements.

Name dc:type.qualificationname

PhD

Level dc:type.qualificationlevel

Doctoral

Grantor dc:publisher.institution

Robert Gordon's Institute of Technology

Year dc:date.issued

1976

Author dc:creator

• Abson, Derek S.

Advisor dc:contributor.advisor

• F.G. McIntosh, E. Forrest, and J. Eades

• State-variable analysis
• Degenerate system
• Adams-Bashforth-Moulton
• Topological tree
• Tie-set matrix
• Pottle's method
• Runge-Kutta method
• Stiff equations
• Auxiliary tree method

Language dc:language

en

Identifier

oai:rgu-repository.worktribe.com:1993274
https://doi.org/10.48526/rgu-wt-1993274

OAI identifier oai:identifier

oai:rgu-repository.worktribe.com:1993274