Explain working of common drain amplifie, Electrical Engineering

Assignment Help:

Q. Explain working of Common drain amplifie?

When an ac signal drives the gate of JFET, it produces an ac drain current. It flows through Rs and produces an ac output voltage that is approximately equal to the input voltage and is in phase with it.

1895_COMMON DRAIN AMPLIFIER.png

fig.(a)  COMMON DRAIN AMPLIFIER

In the figure, R3 = Rs.

From the figure:

Vin = Vgs+gmVgsRs

Vin = (1+gmRs) Vgs

Vout = gmVgsRs

Vout/Vin = gmVgsRs/ (1+gmRs) Vgs = Rs/(1/gm)+Rs

Rs> = 1/g

Vout = Vin Rs/(Rs+(1/gm))

Zin depends on the type of biasing circuit used. In case of voltage divider biasing circuit, Zin = R1 and R2 in parallel.

The common drain amplifier with high input impedance and near-unity voltage gain is used as a buffer amplifier. The common drain amplifier is also known as "SOURCE FOLLOWER".


Related Discussions:- Explain working of common drain amplifie

What are the precautions to be taken, What are the precautions to be taken ...

What are the precautions to be taken before basic work on electrical installations? Ans: Before starting any electrical works on installations disconnect the power supply to

Process , Process The rectangle symbol  is used to represent  the pro...

Process The rectangle symbol  is used to represent  the process  operations as shown below.   MOV A, B

Basic building block of a block diagram, The mathematical relationships of ...

The mathematical relationships of control systems are usually represented by block diagrams, which show the role of various components of the system and the interaction of variable

Saturate the transistor with the base overdriven, For the circuit of Figure...

For the circuit of Figure, given that V CC = 5V, R C = 1k, β = 100, and the high range is 4 to 5 V, choose R B such that any high input will saturate the transistor with the ba

Pneumatics, Design and draw a circuit using the cascade system to operate t...

Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+. The cylinders

Development tool, Development tool for SDR i.e software defined radio

Development tool for SDR i.e software defined radio

Define some applications of digital counters, Define some Applications of D...

Define some Applications of Digital Counters? Digital counters are extremely useful in many applications. They can be effortlessly found in digital clocks and parallel-to-seri

Explain the application of clippers, Q. Explain the application of clippers...

Q. Explain the application of clippers. There are numerous clipper applications. In general clippers are used to perform one of the following two functions: · Changing the s

Circuit theory, Use basic circuit theory to convert the "T" circuit be...

Use basic circuit theory to convert the "T" circuit below into the equivalent "π". Hint: Remember to disconnect the voltage source and the load.

Reversibility principle, The reversibility principle of electrical machines...

The reversibility principle of electrical machines states that an electrical machine can be used to operate either as a motor, converting electrical to mechanical energy, or as a g

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd