Discussion
Why is thermal coupling important when a diode is used for compensation?
Answer: B
Compensation depends on the two drops tracking, and they track only if the devices share a temperature, which means mounting the diode on the same heatsink or in the same package. Matched currents help the initial accuracy rather than the tracking, and neither breakdown voltage nor area is essential. Any scheme that relies on two components matching also relies on them experiencing the same conditions, and temperature is the condition most easily overlooked.
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