Mathematical Review and Circuit Analysis Software Development for Small-Signal Single-Stage Transistor Amplifier Using Hybrid Parameter

In this paper, a mathematical analysis of a Small-Signal Single-Stage Transistor Amplifier using Hybrid Parameter and the development of a software to aid this analysis was carried out. This was borne out of the desire to be able to correctly and accurately analysis small signal transistors to get the required performance quantities that can be used in the design of circuits. Also, the need to carry out this analysis with minimal error and time was of great motivation for this development. The methodology involved two aspects: the mathematical review of the transistor amplifier and the Software development. In the mathematical Analysis, mathematical tools such as matrix and determinant were used to analyze and evaluate the performance quantities namely the input resistance, the current and voltage gains; the output impedance and the power gain of the small-signal single-stage transistor using the generalized h-parameter configuration equations in a two-port system. Also, the conversion of the generalized h-parameter into the three transistor configurations and the conversion from one configuration to another were obtained. The software development was done in two stages which are the Programming of the Analysis Method and the Graphical User Interface (GUI) Development. The Analysis Method programming was done by the use of Visual Basic version 6 Programming Language through the use of Object Oriented Programming designed with a main program and subroutines namely the Mathematical Analysis, the h-parameter Conversion, the Circuit Diagram Simulation and the h-parameter Equivalent Circuit. These Subroutines are called into the main program whenever needed. The Graphical User Interface is a Menu based system for the administration of the Analysis Software Package. It was developed also by the use of Visual Basic version 6 Programming Language and Microsoft Access Office 2000. The software development is resident in a PC with a Windows Operating System. The test results show that the mathematical analysis was correctly done and the developed Software is very fast, efficient, accurate and reliable in analyzing small signal transistor amplifiers as designed