To form an ac equivalent circuit for a FET amplifier, VDD is assumed to be open.

Name: To form an ac equivalent circuit for a FET amplifier, VDD is assumed to be open.
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Quizplus · Accepted Answer

In an AC equivalent circuit for a FET amplifier, the DC supply voltage VDD is replaced with a ground connection because it is considered an AC short circuit due to the capacitive coupling and bypass capacitors in the circuit, effectively 'shorting' AC signals to ground.

To Form an Ac Equivalent Circuit for a FET Amplifier