Answer: (V GS - Vth)².
- A (V<sub>GS</sub> - Vth)
- B (V<sub>GS</sub> - Vth)²
- C (V<sub>GS</sub> - Vth)<sup>0.5</sup>
- D V<sub>DS</sub>
Correct answer: B. (V<sub>GS</sub> - Vth)²
Explanation: Long-channel MOSFET saturation: I<sub>D</sub> = (1/2) mu C<sub>ox</sub> (W/L) (V<sub>GS</sub> - Vth)². Quadratic dependence on overdrive voltage.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.