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

Mini computers - introduction to microprocessors , Mini Computers Large...

Mini Computers Larger  computer  more  computing  power  having  capability to address  more  memory  and  more  speed  than  microcomputer called minicomputer. These computers

truth table in sop form, Normal 0 false false false EN...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Working of r digital to analog converter, 2 n -R D/A CONVERTER An n-bit...

2 n -R D/A CONVERTER An n-bit 2 n -R D/A converter needs 2 n resistors of equal value R and (2 n+1 -2) analog switches. A 3-bit 2 n -R D/A converter is shown in Figure, which

Digital Signal Processing, What is the difference between the unit step fun...

What is the difference between the unit step function u(n+4) and the time-scaled function u(2n+8)

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)

Telephony, connection of STS MUX/DMUX

connection of STS MUX/DMUX

Combinational logic circuit design, Design a circuit to enable a chemical a...

Design a circuit to enable a chemical additive to be introduced into the fluid through another inlet only when the temperature is not too cold or too hot and the fluid is above the

Discuss the closed-loop behavior, Q. Discuss the closed-loop behavior? ...

Q. Discuss the closed-loop behavior? Consider an elementary feedback control system, as shown in Figure, with H = 1. The output variable c and the input e to the direct transmi

Direct 3-bit binary decoding, Q. A table for the direct 3-bit binary decodi...

Q. A table for the direct 3-bit binary decoding is given. Show a block diagram for a 3-to-8 decoder and suggest a method for its implementation.

Di disable interrupts instruction, DI Disable  Interrupts Instruction ...

DI Disable  Interrupts Instruction The interrupt enable  flip flop is reset and all the  interrupts of 8085 microprocessors  except  TRAP  are disabled . the  instruction  form

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