Transistors Characteristics - For CB, CE And CC Transistors - Byju's

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Common Emitter (CE) Configuration of Transistor

The configuration in which the emitter is connected between the collector and base is known as a common emitter configuration.

Common Emitter (CE) Configuration of Transistor

The transistor characteristic under Common Emitter configuration is as follows:

Transistor Characteristics Definition Formula/Expression Characteristic Curve
Input Characteristics The variation of emitter current(IB) with Base-Emitter voltage(VBE), keeping Collector Emitter voltage(VCE) constant. \(\begin{array}{l}R_{in}=\frac{\Delta V_{BE}}{\Delta I_{B}}|V_{CE}=Constant\end{array} \) Common Emitter-1
Output Characteristics The variation of collector current(IC) with Collector-Emitter voltage(VCE), keeping the base current(IB) constant. \(\begin{array}{l}R_{out}=\frac{\Delta V_{CE}}{\Delta I_{C}}|I_{B}=Constant\end{array} \) Common Emitter-2
Current Transfer Characteristics The variation of collector current(IC) with the base current(IB), keeping Collector-Emitter voltage(VCE) constant.

The resulting current gain has a value greater than 1.

 \(\begin{array}{l}\alpha =\frac{\Delta I_{C}}{\Delta I_{B}}|V_{CB}=Constant\end{array} \) Common Emitter-3

Common Base (CB) Configuration of Transistor

In CB Configuration, the base terminal of the transistor will be connected common between the output and the input terminals.

Common Base

The transistor characteristic under Common Base configuration is as follows:

Transistor Characteristics Definition Formula/Expression Characteristic Curve
Input Characteristics The variation of emitter current(IE) with Base-Emitter voltage(VBE), keeping Collector Base voltage(VCB) constant. \(\begin{array}{l}R_{IN}=\frac{\Delta V_{BE}}{\Delta I_{E}}|V_{CB}=Constant\end{array} \) Common Base-1
Output Characteristics The variation of collector current(IC) with Collector-Base voltage(VCB), keeping the emitter current(IE) constant. \(\begin{array}{l}R_{OUT}=\frac{\Delta V_{CB}}{\Delta I_{B}}|I_{E}=Constant\end{array} \) Common Base-2
Current Transfer Characteristics The variation of collector current(IC) with the emitter current(IE), keeping Collector Base voltage(VCB) constant.

The resulting current gain has a value less than 1.

 \(\begin{array}{l}\alpha =\frac{\Delta I_{C}}{\Delta I_{B}}|V_{CB}=Constant\end{array} \) Common Base-3

Common Collector (CC) Configuration of Transistor

In CE Configuration, the Collector terminal of the transistor will be connected common between the output and the input terminals.

Common Collector

The transistor characteristic under Common Collector configuration is as follows:

Transistor Characteristics Definition Characteristic Curve
Input Characteristics The variation of emitter current(IB) with Collector-Base voltage(VCB), keeping Collector Base voltage(VCB) constant. Common Collector-1
Output Characteristics The variation of emitter current(IE) with Collector-Emitter voltage(VCE), keeping the base current(IB) constant. Common Collector-2
Current Transfer Characteristics The variation of Emitter current(IE) with the base current(IB), keeping Collector-Emitter voltage(VCE) constant. Common Collector-3

Frequently Asked Questions – FAQs

Q1

What is a transistor?

A transistor is a semiconductor device used to conduct and insulate electric current or voltage.

Q2

What are the three terminals of a transistor?

There are three terminals for a transistor are:

  • Base
  • Collector
  • Emitter
Q3

What are the types of transistor circuit configurations?

Types of transistor circuit configurations are:
  • Common Emitter Transistor
  • Common Base Transistor
  • Common Collector Transistor
Q4

What is a PNP Transistor?

PNP Transistor is a type of transistor where one n-type material is placed between two p-type materials.Q5

Define the current transfer characteristics?

The current transfer characteristics curve defines the variation of output current in accordance with the input current, keeping the output voltage constant.

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