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What limits how far that approach can be taken?

  • A.The total gain cannot exceed the device's transition frequency
  • B.Each stage adds a low-frequency break that raises the lower limit
  • C.The supply current grows in proportion to the stage count
  • D.Bandwidth shrinkage compounds as stages are added

Answer: D

The shrinkage factor worsens with each stage - modest for two, severe for six - so beyond some number the compounding costs more bandwidth than the extra stage's own width provides. The gain is not bounded by a frequency, the low-frequency breaks are a real but separate cost, and supply current is an economic rather than a bandwidth limit. An approach that improves a figure per stage while degrading it per cascade has an optimum number of stages, and finding it is part of the design.

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