17 Questions
What is the reason behind calling certain capacitances 'junction' capacitances?
Because they are formed between the two materials at PN junctions
Which junction capacitance is concerned with the Source to Body capacitance in a CMOS structure?
Csb
In a n+ / p junction, what does the Area of diffusion region to substrate beneath gate equal to?
$W \cdot xj$
Which factor highly influences the capacitances discussed in the text?
Bias voltages
What is the purpose of the junction capacitances in CMOS structures?
To store charge and control the operation of transistors
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
What is the formula to calculate the overlap capacitance CGD (overlap) in an N-Channel MOSFET?
$Cox \times W \times LD$
What is the capacitance that can be approximated by $Cox \times W \times L$ in an N-Channel MOSFET?
Cgb
Which capacitances in an N-Channel MOSFET are voltage-independent?
CGD (overlap) and CGS (overlap)
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
What determines the overlap capacitances CGS (overlap) and CGD (overlap) in an N-Channel MOSFET?
Gate electrode overlap with source and drain regions
What is the formula for calculating the charge in the channel of an N-Channel MOSFET?
Qchannel = CoxWL(Vgs - Vt)
What is the relationship between carrier velocity (v) and lateral electric field (E) in an N-Channel MOSFET?
v is directly proportional to E
How do you calculate the time required for carriers to cross the channel in an N-Channel MOSFET?
t = L / v
What does the lateral electric field in an N-Channel MOSFET depend on?
Channel length (L)
In the N-Channel MOSFET characteristics, what does Cox represent?
Channel capacitance
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)
Learn about the characteristics of N-Channel MOSFET, including the structure resembling a parallel plate capacitor and calculations involving charge in the channel. Explore concepts like capacitance, gate voltage, and insulating materials.
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