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Discussion

Choose the most appropriate matching of the items in Column 1 with those in Column 2.

Column 1Column 2
(i) PIN diodeP. Voltage regulation
(ii) Tunnel diodeQ. Radio frequency and microwave devices
(iii) Zener diodeR. Optoelectronic detection
(iv) Photo diodeS. Oscillator

  • A.(i) - Q; (ii) - S; (iii) - P; (iv) - R
  • B.(i) - R; (ii) - Q; (iii) - P; (iv) - S
  • C.(i) - R; (ii) - S; (iii) - P; (iv) - Q
  • D.(i) - P; (ii) - Q; (iii) - R; (iv) - S

Answer: A

The correct matching is (i) - Q; (ii) - S; (iii) - P; (iv) - R.

  • The PIN diode, with its wide intrinsic layer and low capacitance, is used as a switch and attenuator in radio-frequency and microwave devices (Q).
  • The tunnel diode has a region of negative differential resistance, which lets it sustain oscillations (S).
  • The Zener diode holds a nearly constant voltage in reverse breakdown, the basis of voltage regulation (P).
  • The photo diode turns incident light into current, for optoelectronic detection (R).

The other options give the Zener diode a role other than regulation, or the tunnel diode a role other than oscillation, so they fail on at least one pair.

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