Question

a diode that has a negative resistance characteristic is the
select one:
o a. varactor diode
o b. laser diode
o c. tunnel diode
o d. schottky diode

Explanation:

To solve this, we analyze each diode type:

• Varactor diodes (a) are used for tuning, relying on capacitance change, not negative resistance.
• Laser diodes (b) emit light, with no negative resistance characteristic.
• Tunnel diodes (c) exhibit negative resistance in their I - V curve due to quantum tunneling.
• Schottky diodes (d) have low forward voltage drop, no negative resistance.

Answer:

c. tunnel diode