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17 Questions

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N-Channel MOSFET Characteristics

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Questions and Answers

What is the reason behind calling certain capacitances 'junction' capacitances?

Due to their high dependence on bias voltages

Because they are formed between the two materials at PN junctions (correct)

Because they are highly dependent on the channel length of the MOSFET

Due to their relation to the drain of the CMOS structure

Which junction capacitance is concerned with the Source to Body capacitance in a CMOS structure?

Cdb

Cgd

Csb (correct)

Cgs

In a n+ / p junction, what does the Area of diffusion region to substrate beneath gate equal to?

$Y \cdot xj$

$W \cdot Y$

$W \cdot xj$ (correct)

$xj$

Which factor highly influences the capacitances discussed in the text?

Bias voltages (A) Signup and view all the answers

What is the purpose of the junction capacitances in CMOS structures?

To store charge and control the operation of transistors (B) Signup and view all the answers

In cut-off mode of an N-Channel MOSFET, what is the value of gate-to-source and gate-to-drain capacitances?

They are both equal to zero (B) Signup and view all the answers

What is the formula to calculate the overlap capacitance CGD (overlap) in an N-Channel MOSFET?

$Cox \times W \times LD$ (B) Signup and view all the answers

What is the capacitance that can be approximated by $Cox \times W \times L$ in an N-Channel MOSFET?

Cgb (B) Signup and view all the answers

Which capacitances in an N-Channel MOSFET are voltage-independent?

CGD (overlap) and CGS (overlap) (D) Signup and view all the answers

In the linear mode of operation of an N-Channel MOSFET, why is Cgb equal to zero?

Due to the gate electric field shielding the substrate (B) Signup and view all the answers

What determines the overlap capacitances CGS (overlap) and CGD (overlap) in an N-Channel MOSFET?

Gate electrode overlap with source and drain regions (C) Signup and view all the answers

What is the formula for calculating the charge in the channel of an N-Channel MOSFET?

Qchannel = CoxWL(Vgs - Vt) (C) Signup and view all the answers

What is the relationship between carrier velocity (v) and lateral electric field (E) in an N-Channel MOSFET?

v is directly proportional to E (C) Signup and view all the answers

How do you calculate the time required for carriers to cross the channel in an N-Channel MOSFET?

t = L / v (A) Signup and view all the answers

What does the lateral electric field in an N-Channel MOSFET depend on?

Channel length (L) (D) Signup and view all the answers

In the N-Channel MOSFET characteristics, what does Cox represent?

Channel capacitance (C) Signup and view all the answers

How is the charge in the channel related to the gate-source voltage and threshold voltage in an N-Channel MOSFET?

Qchannel = Cox(Vgs - Vt) (C) Signup and view all the answers