Discussion
What does a stage's power gain combine?
Answer: A
Power gain is the product of voltage and current gain, which is why common emitter beats the other two configurations on that measure: common base has no current gain and common collector no voltage gain. The other combinations describe the intrinsic gain, an impedance ratio and the gain-bandwidth product. Which figure of merit to quote depends on what the stage is for, and power gain is the one that ranks the three configurations most clearly.
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