GATE 2023 PH – Question 13
Choose the most appropriate matching.
| Column 1 | Column 2 |
|---|---|
| (i) PIN diode | P. Voltage regulation |
| (ii) Tunnel diode | Q. Radio frequency and microwave devices |
| (iii) Zener diode | R. Optoelectronic detection |
| (iv) Photo diode | S. Oscillator |
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Correct answer: (A) (i) - Q; (ii) - S; (iii) - P; (iv) - R
Explanation
Match each diode with its characteristic use.
- **(i) PIN diode:** an intrinsic layer between p and n regions gives low capacitance and works as a fast switch or attenuator at **radio and microwave frequencies**. (i)-Q.
- **(ii) Tunnel diode:** its heavily doped junction has a region of **negative differential resistance**, which allows it to sustain oscillations, so it is used in **oscillators**. (ii)-S.
- **(iii) Zener diode:** operated in reverse breakdown, it holds a nearly constant voltage, so it is used for **voltage regulation**. (iii)-P.
- **(iv) Photodiode:** converts light into current, for **optoelectronic detection**. (iv)-R.
Match: **(i)-Q, (ii)-S, (iii)-P, (iv)-R** (option A).