Discussion
A transistor amplifier's gain drifts noticeably as the equipment warms up. Which explanation fits best?
Answer: B
Beta rises with temperature and the base drop falls, so a bias arrangement that depends on beta moves the operating point and hence the gain. Transition frequency and capacitance changes are far too small to matter at audio, and saturation voltage is irrelevant in a linear stage. Drift with temperature nearly always traces back to a bias arrangement that fails to cancel a temperature-dependent parameter, which is why the next topic exists. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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