Answer: (VGS - Vth)².
- A (VGS - Vth)
- B (VGS - Vth)²
- C (VGS - Vth)0.5
- D VDS
Correct answer: B. (VGS - Vth)²
Explanation: Long-channel MOSFET saturation: ID = (1/2) mu Cox (W/L) (VGS - 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.