Discussion
Two candidate bias designs are compared for the same stage.
| Parameter | Design A | Design B |
|---|---|---|
| Emitter drop | 0.3 V | 1.5 V |
| Collector swing | 5 V | 3.8 V |
| Stability factor | 6 | 1.4 |
Which design would suit a stage that must work over a wide temperature range?
Answer: C
Over temperature the operating point's drift dominates, so Design B's stability factor of 1.4 against 6 is decisive, and the 1.2 volts of swing given up is a fair price. Design A would be the better choice where the temperature is controlled and the output swing is the binding constraint. A comparison becomes decidable only once the application names which parameter is limiting, and this table is readable either way without that. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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