Discussion
Statement I: The Miller effect worsens as a stage's voltage gain rises.
Statement II: The Miller effect worsens as a stage's source impedance rises.
In the light of the above statements, choose the correct answer.
Answer: A
Both are true, though for different reasons: a higher gain multiplies the capacitance more, and a higher source impedance makes the resulting break frequency lower for the same capacitance. The two combine, which is why a high-gain stage driven from a high impedance is the worst case and why the remedies attack either the gain, as in a cascode, or the drive impedance, as with a preceding follower.
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