Discussion
Why does a cascade's bandwidth fall below that of its individual stages?
Answer: D
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. Coupling capacitors set low-frequency poles rather than high-frequency ones, the gain-bandwidth product applies per stage rather than to the cascade, and loading affects gain rather than bandwidth directly. Roll-offs multiply in magnitude and add in decibels, and that compounding is what shrinks a cascade's bandwidth.
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