Discussion
Why does a one volt emitter drop stabilise better than a 0.2 volt drop?
Answer: A
The base-emitter drop changes by about two millivolts per degree, and that change matters in proportion to how small the emitter drop is: two millivolts against one volt is a fifth of a per cent, but against two hundred millivolts it is one per cent. Divider current, dissipation and resistor tempco are all beside the point. Whenever a fixed error competes with a designed quantity, making the designed quantity larger is the direct remedy.
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