can JFET can be used as a switching device rather than BJT's?


or can MOSFET be used as a switching device rather than BJT's?


can u list the principles , advantages, and applications of both CE and CB Amplifiers..?

 

The answer for the first two is yes, but what turns them on is different, from each other and from a BJT.

The third is a bit long winded, more than I'm willing to get into at the moment. This sure looks like a homework question.

 

can u list the principles , advantages, and applications of both CE and CB Amplifiers..?

Common-emitter and common-base amplifiers have just gone active in the e-book:

Common-emitter amplifier

Common-base amplifier

Have a read of these articles and post up your conclusions - members can then give you guidance on your answers.

Dave

 

Field Effect Transistors can be used to replace normal Bipolar Junction Transistors in electronic circuits and a simple comparison between FET's and transistors stating both their advantages and their disadvantages is given below.

Field Effect Transistor (FET) Bipolar Junction Transistor (BJT)
1 Low voltage gain High voltage gain
2 High current gain Low current gain
3 Very input impedance Low input impedance
4 High output impedance Low output impedance
5 Low noise generation Medium noise generation
6 Fast switching time Medium switching time
7 Easily damaged by static Robust
8 Some require an input to turn it "OFF" Requires zero input to turn it "OFF"
9 Voltage controlled device Current controlled device
10 Exhibits the properties of a Resistor
11 More expensive than bipolar Cheap
12 Difficult to bias Easy to bias