What is the configuration called when the emitter terminal of a transistor is common to both input and output circuits?
Common emitter
The question pertains to the configurations of a transistor which are based on which terminal is common to both the input and output circuits. Let's discuss the provided options to understand the correct answer:
- Common base: In this configuration, the base terminal is common to both the input and output circuits. It is characterized by high voltage gain but low current gain.
- Emitter follower (Common collector): Here, the collector terminal is common. It is also known as an emitter follower due to the voltage across the emitter following the input voltage.
- Common emitter: This is the most popular configuration where the emitter terminal is common to both input and output circuits. It provides both voltage and current gain and is widely used in amplification.
- Common collector: This is another term for the emitter follower configuration.
Therefore, the correct answer is Common emitter. This configuration has the emitter terminal connected to both input and output circuits, making it a potent choice for amplification due to its gain characteristics.
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