Discussion
What does the gain-bandwidth product of a stage stay roughly constant under?
Answer: D
Increasing the load resistance raises the gain and lowers the break frequency in the same proportion, so their product is unchanged and gain can be traded for bandwidth freely. Operating current changes the transconductance and so the product itself, and supply and temperature act on other things. A conserved product is the most useful kind of relation in design, because it states exactly what one improvement will cost elsewhere.
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