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

Determine capacitance of capacitor, Determine Capacitance of capacitor: ...

Determine Capacitance of capacitor: A 20 Ω resistor is connected in series with a coil, a capacitor and an ammeter across a 25 V variable frequency supply. While the frequency

Binary coded decimal addition, Q. Binary Coded Decimal Addition Now as ...

Q. Binary Coded Decimal Addition Now as in conventional decimal addition, Binary Coded Decimal addition is performed one decimal digit at a time. What happens when the sum g

Obtain the complete solution for the current, For the circuit of Figure, ob...

For the circuit of Figure, obtain the complete solution for the current i L (t) through the 5-H inductor and the voltage v x (t) across the 6- resistor.

Application of microprocessors , Application of Microprocessors Microp...

Application of Microprocessors Microprocessor microcontroller based systems  may be used  in almost  every filed of life  and  their  applications  are increasing day by day

Electronics, Let me know if you can help during the test

Let me know if you can help during the test

Engines, how to make a underwater propulsion system?

how to make a underwater propulsion system?

Four quadrant chopper or class e chopper , Four  Quadrant Chopper or Class...

Four  Quadrant Chopper or Class E chopper                                                                    Figure class E chopper circuit  Mode I When

Determine the number of poles of this ac motor, Q. A three-phase ac motor, ...

Q. A three-phase ac motor, used to drive a draft fan, is connected to a 60-Hz voltage supply. At noload, the speed is 1188 r/min; at full load, the speed drops to 1128 r/min. (a

What is polarisation, What is polarisation? Explain. While a dielectric...

What is polarisation? Explain. While a dielectric material is related an electric field the dipoles of the material find oriented in a certain direction under the effect of the

wind turbine, pls how can i stat up building wind turbin

pls how can i stat up building wind turbine

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