Discussion
What limits the maximum voltage gain a single common-emitter stage can reach?
Answer: B
Even with an infinite load resistor the gain saturates at the transconductance times the device's output resistance, which is the Early voltage divided by the thermal voltage - a few thousand. The supply voltage limits the swing rather than the gain, beta does not appear in the expression, and base resistance affects bandwidth and noise. A limit that survives making the external components ideal is an intrinsic device limit, and that is what makes it worth knowing.
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