EXPLORING THE TRANSISTOR ON-STATE AND OFF-STATE IMPEDANCE BY USING MATLAB

Abstract

Impedance parameters, also known as Z-parameters or network parameters, are used to describe the behavior of linear electrical networks. They relate the voltage and current at the terminals of a network element or a network of interconnected elements. The transistor element is widely used in electronic design applications. It is known that the transistor element has very important functions in electronic designs for industrial purposes. The aim of this study is to obtain mathematical formulas relating on-state and off-state impedance with other transistor’s parameters in common emitter transistor circuits, then check the effectiveness of each parameter, which enable us to more control the transistor in the purpose of enhancing its performance so the hole network efficiently. For this purpose, the obtained formulas were investigated using MATLAB software. Obtained findings and parameters affecting on-state and off-state impedance states or called affecting factors are presented with the help of graphics. In the off-state, a transistor is typically in a non-conducting state, and the collector current is approximately zero. Therefore, in the off-state of a transistor, the open-circuit collector current is considered negligible, or effectively zero. Whereas, in the on state of a transistor, the emitter-base voltage typically depends on the specific operating conditions and the transistor biassing. The voltage between the emitter and base terminals can vary based on the applied input voltage, load conditions, and the transistor's characteristics.