For 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:

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UGC NET Paper 2: Electronic Science 29 Oct 2022 Shift 1
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  1. (A), (B) and (C) only
  2. (A), (B) and (D) only
  3. (B), (C) and (D) only
  4. (B) and (E) only

Answer (Detailed Solution Below)

Option 1 : (A), (B) and (C) only
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UGC NET Paper 1: Held on 21st August 2024 Shift 1
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Detailed Solution

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Difference 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.

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