emitterföljarsteg

Emitterföljarsteg, also known as emitter followers or common collector amplifiers, are a type of transistor amplifier configuration. In this configuration, the transistor is connected such that the emitter is used as the output terminal, while the collector is connected to a positive voltage supply. The base is used as the input terminal. This configuration is characterized by its high input impedance and low output impedance, making it suitable for applications where a buffer stage is needed to match impedances between stages.

The emitter follower configuration provides voltage amplification, but the voltage gain is typically less than one. However, it offers excellent current amplification and is widely used in applications requiring high input impedance and low output impedance. One of the key advantages of the emitter follower is its ability to provide a low-impedance output, which is useful in driving loads that require a low-impedance source.

In practical applications, emitter followers are often used as buffer stages between high-impedance sources and low-impedance loads. They are also used in audio amplifiers to provide a low-impedance output to drive speakers. The configuration is simple and reliable, making it a popular choice in both analog and digital circuits. Despite its lower voltage gain, the emitter follower's ability to provide a low-impedance output and buffer high-impedance sources makes it a valuable tool in circuit design.