Electronics - Field Effect Transistors (FET) - Discussion


Junction Field Effect Transistors (JFET) contain how many diodes?

[A]. 4
[B]. 3
[C]. 2
[D]. 1

Answer: Option C


No answer description available for this question.

Bhagatsingh said: (Nov 4, 2010)  
How can be verified that a JFET contains one diode?.

Shivam Pandey said: (Jul 29, 2011)  
A diode is basically --- two doped segment of semiconductor fused together. Thus, there forms a POTENTIAL BARRIER.

According to this aspect, JFET should have 2 diode which formed due to 2 side GATES with the channel.

Daljit Bajwa said: (Sep 30, 2011)  
An N-channel JFET consists of a N-type silicon bar and also consists of two p type semicondutors on both sides. These form two pn junctions or we can say two diodes. So the answer to this question will be two diodes.

Pavan Kumar.N said: (Oct 30, 2011)  
Yeah physically it has two diodes but since during the operation we short the substrate to source the effect of the second diode cannot be seen hence the answer is one diode.

Myca said: (Nov 3, 2011)  
An NPN transistor looks like two diodes with the anodes connected together.The point where the anodes connect is called the base, one cathode is called the collector, and the other cathode is called the emitter.

Similarly the PNP transistor looks like two diodes with the cathodes connected together.

Answer C: 2 diodes

Vinay Kumar Singh said: (Nov 7, 2011)  
A FET should be consist of two diode two gates and a single channel.

Nagendra Pal said: (Jul 6, 2012)  
Since FET consist one layer of N and two layer of P which are internally connected to each other so it form a single diode.

Abhinav said: (Jul 8, 2012)  
FET surely contains one layer of n and two layers of p but during its operation the second layer of p or the substrate is shorted. Therefore it is not counted a/c to me. During the working of fet only one layer of p and n act as a single diode.

Pushpendra Kumar Chaurasiya said: (Aug 19, 2012)  
Answer of pavan kumar and was right.

If you know the characteristics of JFET at pinch off condition, then potential barrier takes place at only between drain and source, not in between gate and source because both are at same potential.

Vivek said: (Oct 18, 2013)  
Its a two diode structure, two well of same material with one substrate in between them.

Ysksingh said: (Nov 18, 2013)  
Yeah, Answer is 2 diode because transistor made by 2 diode.

Krishna Kumar said: (Jan 18, 2014)  
Since FET consist one layer of N and two layer of P which are internally connected to each other so it form a single diode.

Wheats said: (Feb 18, 2014)  
BJT's are bi-polar devices and FET's are uni-polar devices.

S.Dhana Lakshmi said: (May 16, 2014)  
I don't understand answer I think that it has two diodes. That is when here n channel same as base terminal how to say single diode. Please send answer.

Dishant said: (Aug 11, 2014)  
Answer should be 1 diode because and layer is of source and drain and p layer is of gate. Since, source and drain are interchangeable, hence answer is 1 diode. This is tricky question.

Md Abu Sayeed said: (Nov 24, 2014)  
As FET made up of one layer of N and two layer of P which are internally shorted so it form a single diode.

Soha said: (Apr 12, 2015)  
FET have one diode because the gate and source junction is connected reversed bias while drain and source terminals are no biased connection. They connect according the source of majority carriers.

Praveen Puspwan said: (Jun 3, 2015)  
One diode because gate material surrounds the channel in the same manner as a belt surrounding our waist. So assume our body is the channel n the belt as gate. One diode is correct.

Shaily Jain said: (Jul 6, 2015)  
My answer is 2 diode.

Because transistor made with combination of 2 diode.

Rameshwar said: (Jul 22, 2015)  
My answer is 2 diode because channel and middle ring part made two diode.

Priyanka Yadav said: (Oct 5, 2015)  
Please give me true answer. I m confused.

Bhagya said: (Jul 29, 2016)  
My answer is that a transistor has two diodes.

Pushu said: (Nov 18, 2016)  
I think it is 3.

Vipin Mv said: (Nov 23, 2016)  
What is the symbol of FET?

Surendhar said: (Aug 3, 2018)  
1 diode is correct.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.