Short Answer

CE (Common Emitter), CB (Common Base), and CC (Common Collector) are three basic transistor configurations used in electronic circuits. They differ in the terminal that is common to both input and output.

CE configuration is widely used for amplification, CB is used for high-frequency applications, and CC is used for impedance matching. Each configuration has different characteristics in terms of gain, input, and output behavior.

Detailed Explanation

CE CB and CC configurations difference

Common Emitter configuration

In the common emitter (CE) configuration, the emitter terminal is common to both input and output circuits. The input is applied between the base and emitter, and the output is taken between the collector and emitter.

This configuration is the most widely used because it provides both current gain and voltage gain. As a result, it gives high power gain, making it suitable for amplification purposes.

In CE configuration, the output signal is inverted, which means it is 180 degrees out of phase with the input signal. It has medium input resistance and high output resistance.

Because of its high gain and good performance, CE configuration is commonly used in audio amplifiers and general-purpose amplifier circuits.

Common Base configuration

In the common base (CB) configuration, the base terminal is common to both input and output. The input is applied between the emitter and base, and the output is taken between the collector and base.

This configuration has low input resistance and high output resistance. It provides high voltage gain but very low current gain. Because of this, the overall power gain is moderate.

One important feature of CB configuration is that it does not produce phase reversal between input and output signals. The output signal is in phase with the input.

CB configuration is mainly used in high-frequency applications because it has better performance at high frequencies and less noise.

Common Collector configuration

In the common collector (CC) configuration, the collector terminal is common to both input and output. The input is applied between the base and collector, and the output is taken between the emitter and collector.

This configuration is also known as an emitter follower. It provides high current gain but voltage gain is approximately equal to one.

CC configuration has high input resistance and low output resistance. Because of this, it is mainly used for impedance matching, where it connects circuits with different impedance levels.

There is no phase difference between input and output signals in this configuration. It is widely used in buffer circuits.

Key differences

The main difference between CE, CB, and CC configurations lies in their common terminal, gain, and application.

CE configuration offers high voltage and current gain, making it suitable for amplification. CB configuration offers high voltage gain but low current gain, making it suitable for high-frequency use. CC configuration offers high current gain and is used for impedance matching.

Each configuration is selected based on the requirement of the circuit.

Conclusion

CE, CB, and CC are three important transistor configurations with different characteristics. CE is best for amplification, CB for high-frequency applications, and CC for impedance matching. Understanding their differences helps in designing effective electronic circuits.