Discussion
Match each composite arrangement with what it multiplies.
List I
A. Darlington pair
B. Cascode
C. Current mirror
List II
P. Current gain
Q. Gain-bandwidth product
R. Nothing; it copies a current
Select the correct match.
Answer: C
The pairing is A-P, B-Q, C-R. Each composite exists because one device could not do the job: the Darlington for gain, the cascode for bandwidth at gain, and the mirror to replicate a current accurately. Asking what a composite buys, and what it costs elsewhere, is the way to decide whether the extra device is worth adding.
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