International Teacher Education Conference 2014 1

International Teacher Education Conference 2014
Designing Simple Voltage/Current Processors in Orcad-PSPICE for Simulation
Based Practical Education
b
Abdullah Ferikoğlu a Yavuz Sarı b Raşit Köker c *
ª Prof. Dr., Electric&Electronics Engineering Dept., Sakarya University, Technology Faculty Esentepe, Sakarya, Turkey
Assist. Prof. Dr., Electronics and Automation Dept., Sakarya University, Hendek Vocational High Schooll Hendek, Sakarya, Turkey
c
Prof.. Dr., Electric&Electronics Engineering Dept., Sakarya University, Technology Faculty Esentepe, Sakarya, Turkey
Abstract
In this paper, simple voltage and current based processor parts are constructed in Orcad-Pspice medium. The
intrinsic differential characteristics of the primitive capacitor and inductor models in Pspice are utilised in the
construction of the,so-called here, processor parts. The designed compact parts are shown to be effective in
taking integral and derivative of input signals, either voltage or current form, simultaneously. This study will
help students to understand the fundamentals of simple voltage/current processors.
Keywords. Orcad, PSpice, simulation, voltage/current processors
INTRODUCTION
Pspice has been extensively used as an CAD [1-8] tool of both analog and digital parts, circuits and systems.
On the other hand, it is well known that, by using Pspice models, many mathematical equations, including both
linear and nonlinear differential equations, can be solved.
In the simulation of differential equations several different approaches may be followed. For example, the
differential equation is transformed into Laplace domain and Pspice ‘s’ parameter are used as part of the
simılation circuit, or the differential equation is first arranged in a special order and integrator (plus summer)
blocks are realized with some operational differential device models.
In this work, the intrinsic differential characteristics of the primitive capacitor and inductor models in Pspice
are utilised in the construction of the designed compact, so-called here, processor parts. Although processing
range of them is limited to integration and derivation, they can perform both functions simultaneously, one on
voltage and the other on current input signals.
The performance of the processors are tested successfully with examplary signals.
Processor circuitry
The voltage processor circuit is given in Figure 1. Both integral and differential stages provide a high enough
input resistance. Shunt resistor for the integral stage is also very high and used as the consequence of a Pspice
connection rule.
The current processor circuit is given in Figure 2. Both integral and differential stages provide a low enough
input resistance. It can be made much near to zero but must take a nonzero value.
Test run
The processors are tested, one with a squarewave input signal the other with a trianglewave input. The results
obtained are provided below.
E-mail address: af@sakarya.edu.tr , sari@sakarya.edu.tr , rkoker@sakarya.edu.tr
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