Lecture 3

Section 2.5Dependent Sources

Characteristics

• Dependent sources establish a voltage or current whose value depends on the value of a voltage or current else where in the circuit.

• You cannot specify the value of a dependent source unless you know the value of the voltage or current on which it depends.

Dependent Sources

BJT Example (2)

Class: ES231Circuit: Audio amplifier

BJT Example (2)

Bipolar Junction Transistor=BJTA BJT can be modeled by a voltage Controlled current source.

A Simple Voltage Amplifier

You will learn how to represent the amplifierusing its small signal model.

Let’s concentrate on the small signal model for now.1. Assign Io2. Apply KCL3. Determine the Vout/V1

Example 1

Find vo