Which of the following is a common use of a Schottky diode?
In oscillator circuits as the negative resistance element
As a variable capacitance in an automatic frequency control circuit
In power supplies as a constant voltage reference
As a VHF/UHF mixer or detector✓Bonne réponse
Explication
A Schottky junction conducts by majority carriers alone, so it stores essentially no charge and switches fast enough to rectify signals well into the microwave range — exactly what a VHF or UHF mixer or detector needs. Negative-resistance oscillators use tunnel diodes, automatic frequency control uses varactors, and voltage references use Zeners.