Out of the common-base, common-emitter and common-collector...

Out of the common-base, common-emitter and common-collector configurations of the transistor amplifier, the voltage gain is highest in
(a) common-base
(b) common-collector
(c) common-emitter
(d) equal in all the cases

Key Concepts

Transistor Amplifier Configurations

Transistor amplifier configurations refer to the different ways of connecting a transistor in a circuit, namely common-base, common-emitter, and common-collector. These configurations influence important parameters such as voltage gain, current gain, input and output impedance, and phase characteristics, which determine their suitability for various applications in amplifying electronic signals.

Voltage Gain

Voltage gain is a measure of the amplification provided by an amplifier, defined as the ratio of the output voltage to the input voltage. It is a key parameter in evaluating the performance of amplifier configurations and determines how effectively an amplifier increases the amplitude of the input signal.

Common-Base Configuration

The common-base configuration uses the base terminal as a common point between the input and the output circuits. It is known for providing the highest voltage gain compared to the other configurations, alongside exhibiting low input impedance and good performance at high frequencies, making it suitable for specific signal amplification requirements.

Common-Emitter Configuration

The common-emitter configuration is one of the most popular amplifier designs, where the emitter terminal is common to both the input and output circuits. This configuration offers significant voltage and current gain, along with a phase inversion between the input and output signals, making it versatile for a wide range of amplification tasks.

Common-Collector Configuration

Also known as the emitter follower, the common-collector configuration features the collector terminal common to both the input and output. It is characterized by a voltage gain near unity, high input impedance, and low output impedance, making it ideal for buffering applications and impedance matching rather than for high amplification.

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