Question

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

Explanation:

To determine the diode with negative resistance, we analyze each option:

• Option a: Varactor diodes are used for capacitance variation, not negative resistance.
• Option b: Tunnel diodes exhibit negative resistance in their IV - curve (current decreases with increasing voltage in a region), which is a key characteristic.
• Option c: Laser diodes are for light emission, no negative resistance.
• Option d: Schottky diodes have low forward voltage drop, no negative resistance.

Answer:

b. tunnel diode