Jfet common source amplifier, Electrical Engineering

Assignment Help:

Q. JFET Common Source Amplifier?

The common source configuration for a FET is similar to the common emitter bipolar transistor configuration, and is shown in figure. The common source amplifier can provide both a voltage and current gain. Since the input resistance looking into the gate is extremely large the current gain available from the FET amplifier can be quite large, but the voltage gain is generally inferior to that available from a bipolar device. Thus FET amplifiers are most useful with high output-impedance signal sources where a large current gain is the primary requirement. The source by-pass capacitor provides a low impedance path to ground for high frequency components of and hence AC signals will not cause a swing in the bias voltage.

Since the FET gate current is small we can make the approximations is = io and vs = - vas the source is positive with respect to the gate for reverse-bias. Since at low frequencies we can ignore the capacitor the source voltage is given by

1655_JFET Common Source Amplifier.png

Using the transconductance equation we can write

2205_JFET Common Source Amplifier.png


Related Discussions:- Jfet common source amplifier

What is the procedure of binary division, Q. What is the procedure of Binar...

Q. What is the procedure of Binary Division? The Binary division is the repeated process of subtraction, just as in decimal division. Signed Numbers Representation If w

Describe the term pure hardware delay, Question: (a) Describe the term...

Question: (a) Describe the term "Pure Hardware Delay" in microcontroller design. (b) Name the three types of subroutines which are placed at the interrupt location in ROM a

Passive filters, Passive filters: Passive implementations of linear fi...

Passive filters: Passive implementations of linear filters are based upon combinations of inductors (L), resistors (R), and capacitors (C). These sorts are collectively termed

Combination of uni-selectors and two motion selectors, Q Using a combinatio...

Q Using a combination of Uni-selectors and two motion selectors, draw a diagram of thousand line exchange and illustrate its working. Ans: The diagram for such an exchange i

Analysis of semiconductor devices, Analysis of Semiconductor Devices T...

Analysis of Semiconductor Devices There are two complementary techniques of studying semiconductor devices: Via numerical simulation of the semiconductor equation

Loops and subroutines, 1.....If viewing this through the Assignment tool, c...

1.....If viewing this through the Assignment tool, click the title above to go to the Submissions area. Introduction The purpose of this experiment is to examine the opera

RESISTACE, What is the value of a resistor marked as 47KK?

What is the value of a resistor marked as 47KK?

What is the purpose of segment registers in 8086, What is the purpose of se...

What is the purpose of segment registers in 8086? There are 4 segment registers present in 8086. They are 1. Code Segment (CS ) register 2. Data Segment (DS ) register

Name the various magnetically hard alloys, Name the various magnetically ha...

Name the various magnetically hard alloys. Several of the magnetically hard materials are rare earth carbon steel, cobalt, tungsten steel, alnico, hard ferrites and cobalt stee

Non inverting summing amplifier, Q. In the non inverting summing amplifier ...

Q. In the non inverting summing amplifier of Figure, let R d = 1k and M = 6. Find R f so that v =

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