An adventurous student replaces the nmos source follower in


An adventurous student replaces the NMOS source follower in Fig. 12.90 with a PMOS common-source stage (Fig. 12.91). Unfortunately, the amplifier does not operate well.

(a) Prove by inspection that the feedback is positive.

(b) Breaking the loop at the gate of M2, determine the loop gain and prove that the feedback is positive.

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Econometrics: An adventurous student replaces the nmos source follower in
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