Electronics - Field Effect Transistors (FET) - Discussion
Discussion Forum : Field Effect Transistors (FET) - General Questions (Q.No. 10)
10.
What is the input impedance of a common-gate configured JFET?
Discussion:
19 comments Page 1 of 2.
Essilfie Ishmael said:
10 years ago
JFET has high impedance rather since it is always reverse bias. If it were to be forward bias then it will have low impedance.
Hemant Gairola said:
3 years ago
A FET has very high input impedance in a gate-source configuration only. Which is widely used in the operation of FET.
Historia said:
4 years ago
Common gate FET configuration provides a low input impedance while offering a high output impedance. Although the voltage gain is high, the current gain is low and the overall power gain is also low when compared to the other FET circuit configurations available.
Nishi said:
5 years ago
Yes, you are right @Divya.
EMMANUEL EKIRAPA said:
6 years ago
Common drain and source impedance is high depending on the small adjustment in the gate source voltage thus common gate configuration inputting a very low impedance and high out put impedance. Therefore, the answer is very low.
Ankit said:
9 years ago
Input impedance of JFET is always very very because a reverse voltage V(GS) is applied across the gate and source.
Uday kumar said:
9 years ago
Good answer @Divya.
Nagi said:
9 years ago
Well said, you are right @Divya.
Vipin said:
9 years ago
Right @Divya.
Divya said:
9 years ago
Just like a bit CB mode, here common gate JFET concept, the input signal applied to the source, the output is taken at the drain, and the source is grounded.
Therefore, it is having less input impedance, used as a voltage follower.
Therefore, it is having less input impedance, used as a voltage follower.
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