Discussion
Why must a bias network be designed for the whole beta range rather than its nominal value?
Answer: A
A data sheet quoting one hundred to three hundred means any circuit whose operating point follows beta will differ threefold across a production batch, so both extremes must be checked. The measurement current is stated and can be allowed for, beta does not degrade in normal service, and the figure is quoted at a stated temperature rather than the maximum. Designing against a range rather than a value is what makes a circuit manufacturable in quantity rather than merely functional once.
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