Virtual Labs

What does the 'oxide' in a MOS capacitor typically refer to?

a: Silicon Nitride Explanation

Explanation

b: Silicon Dioxide Explanation

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c: Gallium Arsenide Explanation

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d: Metal Oxide Explanation

Explanation

What region forms in a p-type substrate under a positive gate voltage in a MOS capacitor?

a: Accumulation Explanation

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b: Depletion Explanation

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c: Inversion Explanation

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d: No region forms Explanation

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Which terminal controls the operation of the MOS capacitor?

a: Source Explanation

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b: Drain Explanation

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c: Gate Explanation

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d: Body Explanation

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What condition defines the threshold voltage (V_T) in a MOS capacitor?

a: When accumulation begins Explanation

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b: When depletion ends Explanation

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c: When strong inversion begins Explanation

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d: When the oxide breakdown occurs Explanation

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Which of the following increases the threshold voltage in a MOS capacitor?

a: Increasing oxide thickness Explanation

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b: Decreasing substrate doping Explanation

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c: Applying a negative body bias (for nMOS) Explanation

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d: Using a metal with lower work function Explanation

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What happens to the surface potential as the gate voltage increases positively in a p-type MOS cap?

a: It becomes more negative Explanation

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b: It remains constant Explanation

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c: It increases positively Explanation

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d: It decreases first and then increases Explanation

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The flatband voltage in a MOS structure is defined when:

a: Surface potential is zero and no charge is in the oxide Explanation

Explanation

b: Depletion region just starts to form Explanation

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c: Gate voltage equals threshold voltage Explanation

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d: Inversion layer is formed Explanation

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In a MOS cap, how does increasing temperature affect the threshold voltage (V_T)?

a: It increases due to higher carrier mobility Explanation

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b: It decreases due to reduction in built-in potential Explanation

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c: It remains constant Explanation

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d: It becomes undefined Explanation

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In strong inversion, what determines the majority carrier concentration at the surface?

a: Substrate doping Explanation

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b: Oxide capacitance Explanation

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c: Surface potential equal to twice the Fermi potential Explanation

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d: Gate work function only Explanation

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MOS Capacitors