Which type of amplifier configuration has more current gain than common emitter or common base?

The common collector amplifier, also known as an emitter follower, is characterized by its ability to provide a high current gain. In this configuration, the input signal is applied to the base of the transistor, and the output is taken from the emitter. This arrangement allows the amplifier to maintain a voltage close to the input voltage but with increased current handling capability.

The key feature of the common collector amplifier is that while it provides a voltage gain of slightly less than one (since it follows the input voltage), it can deliver a substantial increase in current. This makes it particularly useful in applications where impedance matching is crucial, as the configuration allows for driving loads with a lower impedance.

In contrast, both the common emitter and common base configurations have limitations in current gain when compared to the common collector. The common emitter configuration typically provides higher voltage gain but less current gain than the common collector. The common base amplifier, while it can handle higher frequencies, does not enhance current gain in the same way.

Thus, the common collector amplifier stands out in its ability to provide greater current gain, making it especially valuable in various electronic applications requiring higher current output without sacrificing much voltage gain.