Why the common collector amplifier is also called as an emitter follower?

Common Collector/ Emitter Follower Transistor Amplifier Basics. In the Common Collector transistor configuration, we use the collector terminal as common for both input and output signals. This configuration is also known as emitter follower configuration because the emitter voltage follows the base voltage.

Why common collector can be used as a voltage buffer?

Although the common collector amplifier is not very good at being a voltage amplifier, because as we have seen, its small signal voltage gain is approximately equal to one (AV ≅ 1), it does however make a very good voltage buffer circuit due to its high input (ZIN) and low output (ZOUT) impedances, providing isolation …

Why is it called voltage follower?

The reason it is called a voltage follower is because the output voltage directly follows the input voltage, meaning the output voltage is the same as the input voltage. A voltage follower acts as a buffer, providing no amplification or attenuation to the signal.

What is the function of a voltage follower?

The voltage follower is the safest and easiest transistor amplifier circuit to build. Its purpose is to provide approximately the same voltage to a load as what is input to the amplifier but at a much greater current. In other words, it has no voltage gain, but it does have current gain.

Why is common emitter common?

It is also named common-emitter amplifier because the emitter of the transistor is common to both the input circuit and output circuit. Since the emitter is connected to the ground, it is common to signals, input and output.

What is the reason why a common collector is used for impedance matching?

Common collector configuration, also known as emitter follower provides high input impedance and low output impedance. So they are used for the purpose of impedance matching. In common collector configuration, the collector terminal is common to both input and output terminals.

What is the purpose of a voltage follower explain the answer by considering power amplification and impedance matching?

Voltage followers have high input impedance and low output impedance—this is the essence of their buffering action. They strengthen a signal and thereby allow a high-impedance source to drive a low-impedance load. An op-amp used in a voltage-follower configuration must be specified as “unity-gain stable.”

Which transistor configuration is used in voltage followers?

CC configuration is also called a Voltage follower or emitter follower circuit.

What is voltage common collector?

In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.

What is the voltage gain of common emitter voltage feedback circuit?

Common Emitter Voltage Gain Then at high frequencies RE = 0, making the gain infinite. However, bipolar transistors have a small internal resistance built into their Emitter region called Re.

What is a common collector in a transistor?

Common collector. In this circuit the base terminal of the transistor serves as the input, the emitter is the output, and the collector is common to both (for example, it may be tied to ground reference or a power supply rail ), hence its name. The analogous field-effect transistor circuit is the common drain amplifier and…

Why are common collector circuits called emitter-follower circuits?

So the output voltage follows the input voltage. so it is called emitter follower. In a common-collector amplifier circuit, the output voltage at the emitter terminal “follows” the applied input signal at the base terminal. Thus, CE amplifier circuits are also called emitter-follower circuits.

What is the output voltage of a common collector?

Common collector: Output equals input less a 0.7 V VBE drop. Unlike the common-emitter amplifier from the previous section, the common-collector produces an output voltage direct rather than inverse proportion to the rising input voltage. As the input voltage increases, so do the output voltage.

What is a common collector amplifier?

In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.