MOSFET amplifier's operational effects on negative half cycle

Q.  Which among the below stated consequences occur in the negative half-cycle during the operation of MOSFET as an amplifier?
- Published on 23 Sep 15

a. Variation in VGS sinusoidally below VGSQ
b. Variation in ID sinusoidally below IDQ
c. Variation in voltage drop IDRD below its Q-point value
d. All of the above

ANSWER: All of the above

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    Discussion

  • Satyawati Patil   -Posted on 07 Oct 15
    In MOSFET, the DC power supply is switched on in order to locate Q-point in saturation region and hence, the small ac signal is applied at the gate.

    The operation of MOSFET includes the positive and the negative half-cycles of applied input voltage. There are several consequences which occur at positive & negative half-cycles of an applied input voltage.

    However, during the negative half-cycle, gate-to-source voltage exhibits sinusoidal variations below VGSQ .Due to this, drain current also changes sinusoidally below IDQ.

    This leads to the variation in voltage drop IDRD below its value of Q-point,thereby resulting into the sinusoidal change of drain-to-source voltage above its Q-point value.

    Consequently, these effects or changes which occur in the negative half-cycle yields an amplified but inverted version of input voltage across the drain and source terminals.

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