An n-p-n transistor circuit is arranged as shown in...

An $n-p-n$ transistor circuit is arranged as shown in adjoining figure. It is
(a) a common-base amplifier circuit
(b) a common-emitter amplifier circuit
(c) a common-collector amplifier circuit
(d) none of the above

Key Concepts

Common-Base Amplifier

A common-base amplifier features the base terminal as the common point between the input and output. This configuration is known for its low input impedance and high voltage gain, making it suitable for high-frequency applications, though it does not offer current gain as prominently as the common-emitter configuration.

Common-Collector Amplifier

Also known as the emitter follower, the common-collector amplifier uses the collector as the common terminal for both the input and output circuits. Its main feature is a high input impedance and low output impedance, delivering a voltage gain close to unity while providing buffering capabilities between stages.

Bipolar Junction Transistor (BJT) Configurations

BJT amplifier circuits can be arranged in different configurations based on which terminal (emitter, base, or collector) is common to both the input and output circuits. These configurations determine the input and output impedances, voltage and current gains, and overall phase relationships, playing a central role in analog circuit design.

Common-Emitter Amplifier

In a common-emitter amplifier, the emitter terminal is common to both the input and output circuits. This configuration is widely used because it provides a good balance between voltage and current gain, and typically inverts the input signal. It serves as a primary building block in many amplifier designs.

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