Discussion
Why does a distributed amplifier avoid the cascading penalty?
Answer: A
A distributed amplifier sums its stages' currents into a common output line rather than passing the signal through each in turn, so the gains add while the roll-offs do not compound. Direct coupling, unity gain and a shared load do not describe it. Changing a cascade into a parallel summation is what escapes the compounding, and it is the standard arrangement wherever very wide bandwidths are needed at the cost of considerable complexity.
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