Question
In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?
Answer Options
- A) 2
- B) 4
- C) 5
- D) 6
Correct Answer: B
Explanation
Figure E6-1 displays schematic symbols for various types of Field-Effect Transistors (FETs). To identify the N-channel dual-gate MOSFET, you look for three specific features: a single line connecting source (S) and drain (D) for the channel; an arrow pointing inward toward the channel (indicating N-channel); and two separate gate terminals (G_1 and G_2) connected to the channel, indicating a dual-gate device.
Symbol 4 meets these criteria: it is an N-channel (arrow points in) FET with two gate connections (G_1 and G_2) to the channel. Dual-gate MOSFETs are often used in RF mixers and gain-controlled amplifiers because the second gate allows for additional signal control, typically used for gain adjustment (AGC) or mixing.
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