Title: Design, Simulation And Performance Comparison Of Four Single-Stage Amplifier Configurations
Authors: Gabriel Ebiowei Moses, David Ebregbe
Volume: 9
Issue: 8
Pages: 166-179
Publication Date: 2025/08/28
Abstract:
This study presents a comprehensive design, simulation, and comparison of four amplifier configurations using an NPN bipolar junction transistor (BJT) and a MOSFET. The configurations analyzed include: Common Emitter (CE) Amplifier with NPN BJT: - High voltage gain - Medium input resistance - High output resistance - Suitable for audio frequency applications Common Source (CS) Amplifier with MOSFET: - High voltage gain, - High input resistance, - High output resistance, - Ideal for high-impedance sources and high-frequency applications Common Collector (CC) Amplifier with NPN BJT (Emitter Follower): - Voltage gain close to unity, - High input resistance, - Low output resistance, - Suitable for impedance matching and buffering. Common Drain (CD) Amplifier with MOSFET (Source Follower): - Voltage gain close to unity, - High input resistance, - Low output resistance, - Ideal for high-frequency applications and impedance matching. Simulation tools were utilized to analyze the behavior of these amplifier configurations, focusing on their mid-band characteristics, gain, poles, zeros, and frequency response. The BODE plot results show that each configuration has its strengths and weaknesses, making them suitable for specific applications. The CE and CS amplifiers provide high voltage gain, making them suitable for applications requiring amplification of weak signals. The CC and CD amplifiers offer high input resistance and low output resistance, making them ideal for impedance matching and buffering applications. The NPN BJT and MOSFET amplifiers exhibit different characteristics, with the MOSFET amplifiers offering higher input resistance and better thermal stability. This study provides a detailed comparison of CE, CS, CC, and CD amplifier configurations using NPN BJT and MOSFET, highlighting their characteristics, advantages, and limitations. The findings can be used to inform the design of amplifiers for specific applications, such as audio systems, radio frequency circuits, and other electronic devices.