E6B06 — Amateur Extra Class

E6B06 : Which of the following is a common use of a Schottky diode?
A In oscillator circuits as the negative resistance element
B As a variable capacitance in an automatic frequency control circuit
C In power supplies as a constant voltage reference
D As a VHF/UHF mixer or detector
Correct Answer: As a VHF/UHF mixer or detector