Why is CC configuration called emitter follower?
Because of this behavior, the common-collector amplifier circuit is also known as the voltage-follower or emitter-follower amplifier, because the emitter load voltage follows the input so closely. The output is the same peak-to-peak amplitude as the input.
Which is known as emitter follower?
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 main reason for use of an emitter follower?
The emitter follower is widely used as a buffer amplifier to reduce the loading on the previous stage and provide a lower impedance output for any following circuits.
Why are emitters called emitters?
When an AC signal is applied to the transistor amplifier it causes the base voltage VB to fluctuate in value at the AC signal. It is also named common-emitter amplifier because the emitter of the transistor is common to both the input circuit and output circuit.
What is emitter follower used for?
Emitter follower is a negative current feedback circuit. Emitter follower configuration, also known as Common collector, provides high input impedance and low output impedance. So they are used for the purpose of impedance matching.
Which configuration of bipolar transistor is called as emitter follower & why for what purpose it is used?
In a BJT configuration when the emitter terminal is used as the output, the network is called an emitter-follower. In this configuration the output voltage is always a shade lower than the input base signal due to the inherent base to emitter drop.
Why is emitter follower useful?
What is the difference between CE and emitter follower circuit?
The main difference between the two will be where the output is taken. For the common emitter amplifier, we will take the output at the collector of the transistor. For the emitter follower, the output will be taken at the emitter of the transistor.
Why is a CC configuration called an emitter follower?
The CC configuration is called the Emitter Follower because the voltage gain of this configuration is 1. Hence, the output voltage is same as input voltage. What is common emitter configuration?
Why is the common collector terminal called an emitter follower?
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.
What can an emitter follower amplifier be used for?
The emitter follower configuration is mostly used as a voltage buffer. These configurations are widely used in impedance matching applications because of their high input impedance. Common collector amplifiers have the following circuit configurations.
What is the input resistance of an emitter follower?
Emitter follower input resistance: The input resistance of the circuit is effectively β times the emitter resistor, R1. AC coupled emitter follower, common collector circuit It is not always possible to directly couple the emitter follower, common collector buffer.