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Computación y Sistemas
versión On-line ISSN 2007-9737versión impresa ISSN 1405-5546
Comp. y Sist. vol.9 no.2 Ciudad de México oct./dic. 2005
Artículos
Computing Symbolic Expressions in Analog Circuits Using Nullors
Cálculo de Expresiones Simbólicas en Circuitos Analógicos usando Anuladores
Esteban Tlelo Cuautle1,2, Carlos Sánchez López1 and Federico Sandoval Ibarra3
1 INAOE, Department of Electronics,
Luis Enrique Erro No. 1, Tonantzintla, Puebla. 72000 México.
Tel/Fax: +522222470517
e.tlelo@ieee.org, csanchez@inaoep.mx
http://www.inaoep.mx
2 Instituto Tecnológico de Puebla
3 CINVESTAV, Guadalajara Unit,
sandoval@ctsdesign.com
Article received on July 14, 2003; accepted en July 08, 2005
Abstract
A novel method is introduced to compute symbolic expressions in analog circuits modeled by nullors. The proposed method is based on the formulation of a compact system of equations (CSEs) by manipulation of datastructures, which highly improves traditional symbolicmethods. It is demonstrated that by modeling all active devices using nullors, the CSEs is easily formulated by manipulation of both the nullor and admittance interconnectionrelationships. Several examples leads us to conclude on the suitability of the proposed symbolicmethod to be incorporated within a symbolic simulator.
Keywords: Symbolic analysis, Modeling and simulation, Circuit theory, Data structures, Nullor.
Resumen
Se presenta un nuevo método para calcular expresiones simbólicas en circuitos analógicos modelados con anuladores (nullors). El método propuesto se basa en la formulación de un sistema de ecuaciones compacto (SEC), a través de la manipulación de estructuras de datos, lo cual mejora notablemente los métodos simbólicos tradicionales. Se demuestra que modelando todos los dispositivos activos usando nullors, el SEC se formula fácilmente por manipulación de las relaciones de interconexión del nullor y admitancias. Algunos ejemplos conducen a concluir en la confiabilidad del método simbólico propuesto para incorporarlo dentro de un simulador simbólico.
Palabras Clave: Análisis simbólico, Modelado y simulación, Teoría de circuitos, Estructura de datos, Anulador.
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Acknowledgment
This work was supported in part by CONACyT/MEXICO under project number 40321, and CoSNET/MEXICO under project number 454.03p.
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