MOSFET AC equivalent - Implementation strategies

Q.  Which among the below mentioned implementation strategies is/are precise to obtain an AC equivalent circuit of MOSFET?

A. Replacement of all capacitors by open circuits
B. Replacement of all capacitors by short circuits
C. Setting of all DC voltages to zero
D. Setting of all DC voltages to unity
- Published on 23 Sep 15

a. A & C
b. B & C
c. B & D
d. A & D

ANSWER: B & C

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    Discussion

  • Satyawati Patil   -Posted on 07 Oct 15
    To obtain an AC equivalent circuit of MOSFET, several implementation strategies must be adopted depending upon their consequences on the circuit. These implementation strategies are similar to those of transistor amplifier.

    These implementation strategies include the replacement of all capacitors by short circuits and the setting of all DC voltages to zero value.

    These configuration variations in the conventional MOSFET circuit yields its A.C. equivalent circuit. As the DC voltages are assigned to be zero, this implies that the DC voltages are blocked and thereby results in the existence of AC voltages.

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