Virtual Labs

In a MOS capacitor with p-type substrate, what charge carriers form the inversion layer?

a: Holes Explanation

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b: Electrons Explanation

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c: Ions Explanation

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d: Protons Explanation

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Which region is characterized by a widening depletion width but no inversion layer?

a: Flatband Explanation

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b: Accumulation Explanation

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c: Depletion Explanation

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d: Inversion Explanation

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What happens to gate capacitance in inversion when measured at high frequency?

a: It increases Explanation

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b: It becomes constant at oxide capacitance Explanation

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c: It drops to zero Explanation

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d: It equals the depletion capacitance Explanation

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Which of the following affects the flatband voltage?

a: Gate oxide thickness Explanation

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b: Metal-semiconductor work function difference Explanation

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c: Substrate resistivity Explanation

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d: Oxide permittivity Explanation

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What is the ideal surface potential at threshold in a MOS capacitor?

a: φ_F Explanation

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b: 0 Explanation

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c: 2φ_F Explanation

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d: -φ_F Explanation

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How does high-frequency behavior differ in MOS C-V characteristics?

a: Inversion is more pronounced Explanation

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b: Capacitance rises in depletion Explanation

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c: Inversion layer doesn’t respond, so capacitance stays low Explanation

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d: Depletion disappears entirely Explanation

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Which of these is a reason for threshold voltage shift in MOS capacitors?

a: Fixed oxide charges Explanation

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b: Electron-hole recombination Explanation

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c: Gate length reduction Explanation

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d: Channel length modulation Explanation

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In a MOS capacitor, increasing the substrate doping concentration will:

a: Reduce the threshold voltage Explanation

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b: Increase the threshold voltage Explanation

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c: Have no effect on threshold voltage Explanation

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d: Eliminate the depletion region Explanation

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What effect does a negative fixed charge in the oxide have on the MOS threshold voltage?

a: It increases the threshold voltage Explanation

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b: It decreases the threshold voltage Explanation

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c: It has no effect Explanation

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d: It changes the substrate doping type Explanation

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MOS Capacitors