Question
Download Solution PDFFor JFET and MOSFET, consider the following statements:
(A) MOSFET is a voltage controlled capacitor
(B) BJT is slower than FET
(C) Input impedance of MOSFET is greater than JFET
(D) Leakage currents are zero in FET
(E) MOSFET are slower that JFET
Choose the correct answer from the options given below:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFDifference between JFET and MOSFET:
Parameter |
MOSFET |
JFET |
Input resistance |
Very high |
high |
Operation mode |
In both depletion and enhancement mode |
Only in depletion mode |
Channel |
Always present in depletion mode. but not present in enhancement mode |
Permanently present |
Channel and gate | forms parallel plate capacitor | forms two p-n junctions |
Fabrication |
easy |
complex |
Drain current |
low |
high |
Gate current |
low |
high |
Gate leakage current |
Less(order of 10-12 A) |
More(order of 10-9 A) |
Signal handling capacity |
more |
less |
Difference between BJT and MOSFET:
Parameter |
MOSFET |
BJT |
Input resistance |
Very high |
low |
Thermal noise |
less |
more |
Thermal stability |
more |
less |
Size |
small |
big |
Gain bandwidth |
low |
high |
Device |
Voltage controlled |
Current controlled |
Switching speed |
higher |
slower |
so statements A, B, and C are correct.
Hence option 1 is correct.
Last updated on Jun 11, 2025
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