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What is the penalty of over-generous shunt peaking?

  • A.An increase in the Miller capacitance seen
  • B.A peak in the response before the roll-off
  • C.A loss of gain across the whole passband
  • D.A rise in the stage's low-frequency break

Answer: B

Too large an inductor makes the load impedance rise more than the capacitance is reducing the gain, so the response peaks before falling - and a peaked response overshoots on a step input. The passband gain and the low-frequency break are unaffected, and the Miller capacitance is a property of the input side. Any compensation that can undercorrect can also overcorrect, and the flat-response condition is a particular value rather than a direction.

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