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

Determine the study of robotics, Determine the study of Robotics Robots...

Determine the study of Robotics Robots can comprise embedded processors or be linked to a computer system. They are pre-programmed to do a specific task or taught' to remember

List few applications of microprocessor-based system, List few applications...

List few applications of microprocessor-based system. It is used: i. For measurements, display and control of current, voltage, temperature, pressure, etc. ii. For traff

Logically and the contents of memory, Logically AND the contents of memory ...

Logically AND the contents of memory Contents of memory  location,  whose address is specified by HL register pair are logically AND with the  contents  of the accumulator. The

Regions of operation, Regions of operation: Applied volta...

Regions of operation: Applied voltages Mode E Forward active E C Saturation E > B

What is meant by regulation, Q. What is meant by regulation? The output...

Q. What is meant by regulation? The output of most power supplies should be a constant voltage. Unfortunately, this is difficult to achieve. There are two factors that can caus

Explain microprocessor development system, Explain Microprocessor developme...

Explain Microprocessor development system. Microprocessor development system: Computer systems consist of undergone many changes lately. Machines which once filled large area

Determine harmonic factor hf of the input current, Q. Consider a full-wave ...

Q. Consider a full-wave single-phase bridge recti?er circuit with dc motor load, as shown in Figure (a). Let the transformer turns ratio be unity. Let the load be such that the

Pdc, disadvantages of shunt&series clippers

disadvantages of shunt&series clippers

What is meant by doping, What is meant by doping? How does it affect a semi...

What is meant by doping? How does it affect a semiconductor? Doping: The process through which an impurity is added to semiconductor is termed as doping. A semiconductor to th

Laplace transform method, Consider the circuit shown in Figure (a) in which...

Consider the circuit shown in Figure (a) in which the switch S has been in position 1 for a long time. Let the switch be changed instantaneously to position 2 at t = 0. Obtain v(t)

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