Discussion
Which specification would you improve by raising the operating current?
Answer: D
Higher current means a smaller intrinsic emitter resistance and so a larger gain from the same collector resistor. It uses more of the supply in the collector resistor's drop, demands a larger bypass capacitor because the emitter resistance is lower, and reduces the input impedance. One change improving one specification while worsening three is the normal case, and the design question is only which of the four matters most. Framing the question as which quantity the change acts upon makes the answer follow without calculation. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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