Discussion
Why is thermal stability a greater concern in power stages?
Answer: D
A small-signal stage dissipating milliwatts barely warms itself, whereas a power stage's own dissipation raises its junction temperature substantially and closes the loop. Gain, breakdown voltage and operating point are all different in power devices but none of them is the reason. A feedback loop only matters when it is actually closed, and self-heating is what closes this one.
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