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The output resistance of a source follower is (a) Low (b) Moderate (c) High (d) None of the above
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Answer: (a)Low

The small signal model of common drain (source follower) circuit is shown.

OUTPUT PART OF COMMON DRAIN CIRCUIT TO CALCULATE OUTPUT IMPEDANCE

Thus, the value of output impedance can be evaluated

Rout=1gm+1ro||rc=1gm

The value of gm is made large enough,so the resultant …

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