Discussion
Match each measure with what it would improve.
List I
A. Larger emitter resistor
B. Stiffer base divider
C. Emitter returned to a negative supply
List II
P. Stability against temperature
Q. Independence from beta
R. Output swing at unchanged stability
Select the correct match.
Answer: A
The pairing is A-P, B-Q, C-R. Each measure attacks a different weakness, which is why a well-designed stage uses more than one of them: the emitter resistor for thermal feedback, the divider stiffness for beta immunity, and the negative supply to escape the headroom cost of the first. Matching a remedy to the specific weakness it addresses is what stops a design accumulating components that all do the same job. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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