Give applications of emitter follower, Electrical Engineering

Q. Give applications of emitter follower

The emitter follower has the following principal applications:

1. To provide current amplification with no voltage gain

2. Impedence matching

Current amplification without voltage gain : Emitter follower is a current amplifier that has no voltage gain. There are many instances where an increase in current is required but no increase in voltage is needed. In such a situation, an emitter follower can be used. Consider the two stage amplifier. Suppose this two stage amplifier has the desired voltage gain but current gain of this multistage amplifier is insufficient. In that case, we can use an emitter follower to increase the current gain without increasing the voltage gain.

Impedance matching: An emitter follower has high input impedance and low output impedance. This makes the emitter follower an ideal circuit for impedance matching. Consider an impedance matching by an emitter follower. Suppose the output impedance of the source is 120 N? while that of load is 20 ? .Emitter follower has an input impedance of 120? and output impedance of 22 ? is connected between high impedance source and low impedance load. The net result of this arrangement is that the maximum power is transferred from the original source to the original load. When an emitter follower is used for this purpose it is called a buffer amplifier. it may also be noted that the job of impedance matching can also be accomplished by a transformer. However the emitter follower is preferred for this purpose. it is because emitter follower is not only more convenient than a transformer but it also has much better frequency response ie.,it works well over a large frequency range.

Posted Date: 6/11/2013 1:26:39 AM | Location : United States

Related Discussions:- Give applications of emitter follower, Assignment Help, Ask Question on Give applications of emitter follower, Get Answer, Expert's Help, Give applications of emitter follower Discussions

Write discussion on Give applications of emitter follower
Your posts are moderated
Related Questions
Q. Purpose of Customer Review in project management? The Customer in conjunction with the Project Manager/ Engineer decides the timing of the IFA review. This review is cond

What do you mean by the term procedure? PROC: The PROC and ENDP directives specify the start and end of a procedure. Such directives force structure while the procedure is cle

matlap code to solve the fast decoupled method

Hi, I need help simulating my project in Proteus, problem is, I have never used it before. This is what I have so far. However, feel free to suggest ideas that will make the circ

Q. It is desired to have a sag or tilt of no more than 10% when a 50Hz square wave is impressed on an amplifier stage. The output circuit resistance is Rv=1K. What minimum value of

Explain the Power Transmission Lines Transmission and distribution of electric power is accomplished by using overhead lines or underground cables. Overhead lines are normally

Q. Consider a conducting loop of length l and width w, as shown in Figure, rotated about its axis (shown by the broken line) at a speed of ωm rad/s under the influence of a magneti

Which Segment is used to store interrupt and subroutine return address registers? Ans) Stack Segment in segment register is used to kept interrupt and subroutine return address

A second-order process with one pole at the origin has the transfer function 3/(s(2s + 1)) Find the output as a function of time, for a unit step input change. Sketch the expected