A BJT can be used in three main amplifier configurations depending on which terminal is common to both the input and output circuits. These are common-base (CB), common-emitter (CE), and common-collector (CC) configurations.
In the common-base configuration, the base terminal is shared by both the input and output circuits. The input signal is applied to the emitter and the output is taken from the collector. This configuration provides high voltage gain but low current gain, and it is often used in high-frequency applications.
In the common-emitter configuration, the emitter is the common terminal. The input signal is applied to the base and the output is taken from the collector. This is the most widely used BJT amplifier because it provides both high voltage gain and significant current gain, making it useful in many amplification circuits.
In the common-collector configuration, the collector is the common terminal. The input is applied to the base and the output is taken from the emitter. This configuration is also called an emitter follower. It provides high current gain but voltage gain close to 1, making it useful for impedance matching and buffering.
Together, these three configurations allow BJTs to perform different amplification roles in electronic circuits.
In the common-base configuration, the base terminal is shared by both the input and output circuits. The input signal is applied to the emitter and the output is taken from the collector. This configuration provides high voltage gain but low current gain, and it is often used in high-frequency applications.
In the common-emitter configuration, the emitter is the common terminal. The input signal is applied to the base and the output is taken from the collector. This is the most widely used BJT amplifier because it provides both high voltage gain and significant current gain, making it useful in many amplification circuits.
In the common-collector configuration, the collector is the common terminal. The input is applied to the base and the output is taken from the emitter. This configuration is also called an emitter follower. It provides high current gain but voltage gain close to 1, making it useful for impedance matching and buffering.
Together, these three configurations allow BJTs to perform different amplification roles in electronic circuits.
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