Discuss input and output characteristics of CB transistor. |...

Name: Problem 16, Chapter 25: Engineering Physics
Uploaded: 2021-06-23T06:31:47-08:00
Duration: 1 min 45 s
Channel: Ajay Singhal
Description: Discuss input and output characteristics of CB transistor.

Key Concepts

Common Base Transistor Configuration

This refers to the configuration of a bipolar junction transistor where the base terminal is common to both the input and output circuits. In this setup, the emitter serves as the input while the collector acts as the output. This configuration is characterized by low input impedance, high output impedance, and a voltage gain that is less than that in a common emitter configuration, making it well-suited for high-frequency applications.

Input Characteristics

The input characteristics of a common base transistor focus on the relationship between the emitter-base voltage and the emitter current. Because the emitter-base junction is forward biased while the base is common to both circuits, the input impedance tends to be low. The input curve typically reflects the exponential behavior of the diode-like emitter-base junction, indicating how small changes in voltage can produce substantial variations in current.

Output Characteristics

The output characteristics involve the behavior of the transistor between the collector and the base. In the common base configuration, the collector current is largely controlled by the emitter current and is relatively independent of the collector-base voltage in the active region, demonstrating a high output impedance. The output curves show that once the transistor is in its active region, changes in collector voltage have minimal effect on the collector current, which is essential for amplification applications.

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