What is the main reason for use of an emitter follower?

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.

What is the voltage gain of an emitter follower?

In practice, the voltage gain of an emitter follower is between 0.8 and 0.999.

What are the advantages of an emitter follower with active current source biasing?

Emitter follower circuit provides high input impedance and low output impedences. The main advantage of using emitter follower configuration is that it provides a voltage gain of unity..Emitter follower circuit are also named as high input impedance circuit..

How does an emitter follower work?

Introduction: Understanding Emitter-Followers: Using Transistors to Reduce Sag. Many electronic circuits, including voltage dividers and filters, produce signals that sag when current is drawn. An Emitter-Follower uses a transistor to reduce this sag by a factor of 100.

Which of the following is are related to an emitter follower configuration?

Which of the following is (are) related to an emitter-follower configuration? The input and output signals are in phase. The voltage gain is slightly less than 1. Output is drawn from the emitter terminal.

Which is also 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 purpose of emitter resistor?

The aim of an AC signal amplifier circuit is to stabilise the DC biased input voltage to the amplifier and thus only amplify the required AC signal. This stabilisation is achieved by the use of an Emitter Resistance which provides the required amount of automatic biasing needed for a common emitter amplifier.

What is the difference between emitter follower and voltage amplifier?

A voltage follower acts as a buffer, providing no amplification or attenuation to the signal. The emitter follower or common collector circuit configuration acts as a buffer, presenting a high impedance to the circuit that is driving it, while offering a lower impedance output.

Where does the voltage come from in an emitter follower?

The emitter follower consists of input voltages (which may or may not come from the same source) at the base and collector of what we call a transistor, with output voltage (and our load, eventually) at the transistor’s emitter. There are two main rules of thumb to know when working with transistors. 1.

How did the emitter follower amplifier get its name?

This name is derived from the fact that the emitter voltage “follows” that of the base circuit – the circuit has unit voltage gain. The emitter follower transistor amplifier has a very straightforward circuit.

Can a emitter follower be driven from low impedance?

Emitter followers are notorious sources of oscillation and should never be directly driven from low impedance sources (again, see References 43 and 44). Marc T. Thompson Ph.D., in Intuitive Analog Circuit Design (Second Edition), 2014

Can a common collector buffer be coupled to an emitter follower?

It is not always possible to directly couple the emitter follower, common collector buffer. When this is the case, it is necessary to add a few additional electronic components: coupling capacitors and bias resistors to the circuit.