C. Sánchez–López*^1,2, E. Martínez–Romero³, E. Tlelo–Cuautle³

¹ Department of Electronics, UAT, Mexico, Czda Apizaquito s/n, Apizaco, Tlaxcala, 140. *E–mail: carlsanmx@yahoo.com.mx

² IMSE–CNM, 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 nullor–based 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 fully–symbolic small–signal characteristics of OTRA–based analog circuits, and the nullor–based OTRAs model can be used in CAD tools. In this manner, the fully–symbolic transfer functions of several application circuits, such as filters and oscillators can easily be approximated.

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 PROMEP–Mexico under the project number UATLX–PTC–088 and by Consejería de Innovación, Ciencia y Empresa, Junta de Andalucía–Spain, under the project number TIC–2532. The first author thanks the support from the JAE–Doc program of CSIC, co–funded by FSE.

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