A crystal diode is characterized by having______________?
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Answer: A. one pn junction
Explanation
A standard crystal diode is fabricated by joining a single p-type semiconductor block with an n-type block. This specific manufacturing process creates exactly one continuous boundary known as a single p-n junction. This single junction structure governs the fundamental unidirectional current flow characteristic of the crystal diode. Semiconductor doping introduces impurities into pure silicon to create regions with excess holes or free electrons. The boundary region between p-type and n-type materials is called the depletion layer or p-n junction. Crystal diodes represent the simplest possible semiconductor device used in basic electronic circuit applications.
Understanding single junction devices is essential before studying more complex transistors and integrated circuits. Crystal diodes serve as the building blocks for more advanced power rectification and signal demodulation systems. Electronics technicians use simple multimeters to verify the single p-n junction integrity during routine troubleshooting. Two p-n junctions are characteristic of bipolar junction transistors rather than simple crystal diodes. Three p-n junctions form four-layer devices such as silicon controlled rectifiers and thyristors. None of the above is incorrect because the single p-n junction definition perfectly describes a crystal diode.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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