AdvancedA-002-002-003
What is a common use for the hot-carrier (Schottky) diode?
B
Answer
Circuit design and power supplies
Type
A
As a constant voltage reference in a power supply
B
As VHF and UHF mixers and detectors
C
As balanced mixers in FM generation
D
As a variable capacitance in an automatic frequency control (AFC) circuit
Answer Notes
Hot-carrier or Schottky diodes are distinguished by their very low forward voltage drop and extremely fast switching speeds. Unlike standard PN junction diodes, Schottky diodes use a metal-semiconductor junction. This design eliminates the charge storage effects that typically slow down reverse recovery time in traditional diodes.
Because of their high-speed capability and exceptionally low junction capacitance, Schottky diodes are ideal for high-frequency radio applications. They are most commonly used as mixers and detectors in VHF, UHF, and microwave circuits where standard PN diodes would be too slow.
The other options describe applications for different components. Constant voltage references use Zener diodes, while variable capacitance for AFC circuits requires a varactor diode.
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