Discussion
What is a current mirror used for?
Answer: B
A mirror uses matched devices sharing a base-emitter voltage so that one branch's current reproduces another's, which is how bias currents are distributed across an integrated circuit. Voltage copying is a follower's job, gain multiplication a Darlington's, and differential-to-single conversion is done by an active load - though a mirror often serves as that load. Matched devices sharing one controlling voltage is the foundation of nearly every integrated analogue building block.
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