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why large value gate resistor is needed in common gate fet amplifier?

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why large value gate resistor is needed in common gate fet amplifier? shouldnt gate be just tied to ground? I see a large value resistor in Mohmsrom gate to ground and a parallel capacitor from gate to ground. Thanks.
 

Same reason an emitter follower is biased above ground? So that you get the full waveform out and now just the positive half?
 

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