UNIVERSITY OF SOUTHERN MINDANAO Bipolar Junction Transistor Review Geraldo P. Ulep Professional Electronics Engineer Subject Professor College of Engineering and Information Technology Department of Electronics Engineering Topic Outline • Hybrid equivalent circuit • Hybrid parameter variation • BJT and FET, all possible circuits Intended Learning Outcomes • (CO1) Review the basic electronics learned in Electronics 1 • (CO2) Analyze different circuits and models at high frequency • (CO3) Analyze and solve transistor circuit problems Review on BJT What is a BJT? A Bipolar Junction Transistor (also known as a BJT or BJT Transistor) is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector and the emitter. A BJT is a type of transistor that uses both electrons and holes as charge carriers. A signal of small amplitude if applied to the base is available in the amplified form at the collector of the transistor. This is the amplification provided by the BJT. Note that it does require an external source of DC power supply to carry out the amplification process. Actual Figure Schematic Symblol There are two types of bipolar junction transistors – NPN transistors and PNP transistors. A diagram of these two types of bipolar junction transistors is given below. From the above figure, we can see that every BJ ...
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