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Journal of applied research and technology
versión On-line ISSN 2448-6736versión impresa ISSN 1665-6423
J. appl. res. technol vol.9 no.1 Ciudad de México abr. 2011
Symbolic Analysis of OTRAsBased Circuits
C. SánchezLópez*1,2, E. MartínezRomero3, E. TleloCuautle3
1 Department of Electronics, UAT, Mexico, Czda Apizaquito s/n, Apizaco, Tlaxcala, 140. *Email: carlsanmx@yahoo.com.mx
2 IMSECNM, CSIC and University of Seville, Spain, Avda. Americo Vespucio s/n, Isla de la Cartuja, Sevilla, 41090.
3 Department of Electronics, INAOE, Mexico, Luis Enrique Erro No. 1 Tonantzintla, Puebla, 72840.
ABSTRACT
A new nullorbased model to describe the behavior of Operational Transresistance Amplifiers (OTRAs) is introduced. The new model is composed of four nullors and three grounded resistors. As a consequence, standard nodal analysis can be applied to compute fullysymbolic smallsignal characteristics of OTRAbased analog circuits, and the nullorbased OTRAs model can be used in CAD tools. In this manner, the fullysymbolic transfer functions of several application circuits, such as filters and oscillators can easily be approximated.
Keywords: Operational Transresistance Amplifier, nullor, nodal analysis.
RESUMEN
En el presente trabajo se presenta un nuevo modelo basado en nullors para describir el comportamiento de amplificadores operacionales de transresistencia (OTRAs). El modelo se compone de cuatro nullors y tres resistores aterrizados; como resultado, se puede aplicar el análisis nodal estándar para calcular características de pequeña señal completamente simbólicas de circuitos analógicos basados en OTRAs; este nuevo modelo puede ser usado en herramientas CAD. De esta forma, las funciones de transferencia completamente simbólica de varios circuitos de aplicación tales como filtros y osciladores, pueden aproximarse fácilmente.
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Acknowledgment
This work has been supported by PROMEPMexico under the project number UATLXPTC088 and by Consejería de Innovación, Ciencia y Empresa, Junta de AndalucíaSpain, under the project number TIC2532. The first author thanks the support from the JAEDoc program of CSIC, cofunded by FSE.
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