Discussion
Why do current mirrors work well in integrated circuits but poorly with discrete devices?
Answer: C
Mirrors depend on two devices having the same base-emitter voltage for the same current, and devices made side by side on one chip at one temperature match far better than two separately packaged parts. Gain, connection and capacitance are not the issue. Any circuit whose accuracy rests on matching rather than on absolute values is an integrated-circuit technique, and recognising that division explains a great deal about why the two design styles differ.
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