Frequency Analysis of a Copper-Based Transistor Amplifier Using Fourier Methods

This study analyzes the frequency response of a common-emitter bipolar junction transistor (BJT) amplifier using Fourier methods. We developed a small-signal model and applied Fourier analysis in MATLAB/Simulink to characterize the amplifier's gain and bandwidth. Key performance metrics, including mid-band gain and lower/upper cut-off frequencies, were extracted. The analysis is based on the concept of a transistor with a copper-enhanced base region, which is known to reduce base resistance and improve high-frequency performance. This work demonstrates the practical application of the Fourier transform for converting time-domain circuit behavior into a frequency-domain transfer function, providing a clear methodology for high-frequency amplifier analysis.