Discussion
Why does a cascade's bandwidth fall below that of its individual stages?
Answer: A
Two identical stages each 3 dB down at some frequency are 6 dB down together, so the combined 3 dB point sits at a lower frequency than either stage's own. Coupling capacitors set low-frequency poles rather than high-frequency ones, loading reduces gain rather than bandwidth directly, and the product applies per stage. Roll-offs multiply as ratios and add as decibels, and that compounding is what shrinks a cascade's bandwidth even when nothing is loading anything.
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