Question
Which of the following describes MOSFET construction?
Answer Options
- A) The gate is formed by a back-biased junction
- B) The gate is separated from the channel by a thin insulating layer
- C) The source is separated from the drain by a thin insulating layer
- D) The source is formed by depositing metal on silicon
Correct Answer: B
Explanation
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of field-effect transistor (FET). Unlike a bipolar transistor (BJT) or a JFET, which rely on junctions, the MOSFET uses a non-conducting oxide layer (silicon dioxide, typically) to separate the gate electrode from the main channel of current flow (source to drain).
This construction means the gate is separated from the channel by a thin insulating layer. This insulating layer gives the MOSFET an extremely high input impedance, which is a major advantage over other transistor types. However, this thin layer can also be easily damaged by static electricity.
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