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Session 1532

A Senior Design Project of a fi Meter Device to Assess Teaching Electronic Concept

Mohamed Shwehdi, Akram Al-Rawi, Chris Jacobsen KFUPM/Columbia College/Hewlett- Packard

ABSTRACT

A novel microprocessor-based large signal forward current ratio Beta (13) meter device was designed as a senior design project, Its prototype was constructed and evaluated in a student environment, The meter provides an easy and convenient way to measure 13 at different quiescent points. This experience is presented in a very systematic approach to show the advantages of going through senior project stages. The J3 calculations and its importance, specifically at high frequencies and temperaturel’2 in BJT’s electronic circuit, usually are done by mathematical/graphical modeling and the curve tracer method. This results in approximate and inefficient results and often causes confhsion to students and was also time consuming for engineers as well as students. This paper presents a complete 13 meter design which is aimed to:

q Demonstrate the interaction/integration between faculty/student and senior design/courses, and ideas learned in an accredited electrical and electronic engineering College/University program. Such integrations include electrical circuits, electronic circuits, programming, microprocessors and many other aspects of electrical engineering, q Help students and engineers in design efficient electronic BJT’s (bipolar junction transistors) or other transistor types amplifier circuits. q Alleviate the confusion for students in the electronic design courses and laboratories. q Replace the method for determination of 8 through curve tracer or other mathematical or graphical methods.

This paper illustrates the new meter design and its fictional use. It is not intended to give a good understanding of the transistor. It highlights the importance of the parameter D and its use in electronic biasing circuits and design. D is a constant for the particular transistor. For modern npn transistors, D is in the range 100 to 200, but it can be as high as 10003. The meter provides a quick and direct measure of values of B at different conditions. It helps in developing confidence when using a curve tracer and using the BJT’s characteristics to find B,

Therefore, it maybe a very valuable device for basic electronic design laboratories and manufacturers. It is extendable, easy to use and may use other microprocessors with minor modifications of the circuitry, Experience using the device was appreciated by students and engineers. Comments were made about its range and improvement.

I. INTRODUCTION

The transistor is the most important example of an “active” component, a device that can amplifi,

?@6’j 1996 ASEE Annual Conference Proceedings ‘.,+,~yEIElj

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Shwehdi, M., & Jacobsen, C., & Al-Rawi, A. (1996, June), A Senior Design Project Of A Fi Meter Device To Assess Teaching Electronic Concept Paper presented at 1996 Annual Conference, Washington, District of Columbia. 10.18260/1-2--6280