Transistors: Ebers-Moll Model and Differential Amplifiers

This lecture delves into the Ebers-Moll model for transistors, exploring how it alters the properties of transistors and introducing the concept of differential amplifiers to reject common-mode signals. The Ebers-Moll model is discussed in detail, focusing on trans-conductance, small-signal impedance, and the Early effect. Differential amplifiers are then presented as a solution to reject common-mode signals by amplifying only the differences between signal leads. The lecture also covers techniques to enhance the common-mode rejection ratio (CMRR) using current-source biasing. Through a series of examples and discussions, students will gain a comprehensive understanding of these essential concepts in transistor circuits.