Question
Which characteristic of a Schottky diode makes it a better choice than a silicon junction diode for use as a power supply rectifier?
Answer Options
- A) Much higher reverse voltage breakdown
- B) More constant reverse avalanche voltage
- C) Longer carrier retention time
- D) Lower forward voltage drop
Correct Answer: D
Explanation
A Schottky diode (or hot-carrier diode) is a metal-semiconductor junction, rather than the standard P-N junction of a silicon diode. This construction results in very different operational characteristics that are advantageous for certain applications, such as high-speed rectifiers in power supplies.
The key characteristic of a Schottky diode is its lower forward voltage drop (typically 0.2 \text{ V} to 0.4 \text{ V}) compared to a standard silicon diode (typically 0.6 \text{ V} to 0.7 \text{ V}). This lower voltage drop means that less power is dissipated as heat within the diode, leading to higher efficiency, especially in high-current, low-voltage power supply rectification stages.
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