Discussion
Match each diode with the property it is chosen for.
List I
A. Schottky
B. Varactor
C. Tunnel
List II
P. Fast recovery and low drop
Q. Bias-dependent capacitance
R. Negative resistance region
Select the correct match.
Answer: D
The pairing is A-P, B-Q, C-R. Each device is an ordinary junction pushed until one property dominates, and knowing which property that is settles every question about where the device belongs: the Schottky in a switching rectifier, the varactor in a tuned circuit, and the tunnel diode in an oscillator or amplifier that needs negative resistance.
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