Discussion
Match each configuration with its property.
List I
A. Common source
B. Common gate
C. Common drain
List II
P. Voltage gain with inversion
Q. Wide bandwidth and low input impedance
R. Unity gain and a high input impedance
Select the correct match.
Answer: B
The pairing is A-P, B-Q, C-R, exactly parallel to common emitter, common base and common collector in the bipolar family. Common source inverts and gives the gain, common gate offers a low input impedance and a wide bandwidth because no inverting gain bridges its terminals, and common drain buffers at unity gain. That the correspondence holds property for property means every intuition about impedance reflection and the Miller effect carries straight across, which halves the work of learning the second family.
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