Discussion
Which stage arrangement approaches the intrinsic gain limit?
Answer: D
Replacing the collector resistor with a current source, whose impedance is very high, lets the device's own output resistance set the gain - which is how the input stage of an operational amplifier reaches its enormous gain. A large emitter resistor reduces the gain deliberately, a follower has none to speak of, and common base has the same intrinsic limit but no current gain. Removing the element that dominates a limit is the way to reach the limit underneath it.
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