Sheet Resistance of MOS Transistors and Inverter MCQ Quiz – Objective Question with Answer for Sheet Resistance of MOS Transistors and Inverter

1. The resistance of the uniform slab of the conducting material is?

A. Linear(proportional) with length
B. Inversely proportional to the thickness
C. Inversely proportional to the width
D. All of the mentioned

Answer: D

The resistance of a uniform slab of conducting material can be expressed as
R = (ρ.l)/(t.w).

2. The sheet resistance of the conducting material is?

A. RS = resistivity/length
B. RS = resistivity/width
C. RS = resistivity/thickness
D. None of the mentioned

Answer: C

The sheet resistance of the conducting material is given by RS = resistivity/thickness.

3. In CMOS manufacturing process Sheet resistance is used instead of resistivity because _______

A. Resistivity is the same for all doped regions
B. Resistivity and thickness are characteristics that cannot be controlled by the circuit designer, and it is expressed as the single sheet resistance parameter
C. Sheet resistance is a dimensionless quantity
D. Sheet resistance is equal to resistivity

Answer: B

It is convenient to use Sheet resistance instead of resistivity because Resistivity and thickness are characteristics that cannot be controlled by the circuit designer, and it is expressed as the single sheet resistance parameter.

4. Compute the sheet resistance of a 0.17 µm thick Cu wire if the resistivity of Cu wire is 1.7 µΩ-cm.

A. 0.01 Ω/square
B. 0.001 Ω/square
C. 10.0 Ω/square
D. 0.10 Ω/square

Answer: D

Sheet resistance of copper is = (1.7*10-8)/(0.17*10-6)=0.10 Ω/square.

5. For semiconductors doped through diffusion or through surface peaked ion implantation we derive the sheet resistance as _____

A. Average resistivity of semiconductor/thickness
B. Resistivity/thickness
C. Conductivity/thickness
D. None of the mentioned

Answer: A

For semiconductors doped through diffusion or through surface peaked ion implantation we derive the sheet resistance using the average resistivity of the material.

6. Sheet resistance of a semiconductor is _______

A. Inherent property of the material
B. Function of the thickness of the material
C. Also called Specific Resistance
D. All of the mentioned

Answer: B

Resistivity is the inherent property of any conducting material. It is also called Specific Resistance. Sheet resistance is a function of thickness as resistivity for material is fixed.

7. Sheet resistance of semiconductor is directly measured using _______

A. Ohmmeter
B. Four-point probe measurement
C. Non-contact eddy current based testing device
D. Any of the mentioned

Answer: B

The sheet resistance of semiconductors is directly measured using a Four-point probe measurement.

8. The resistance of the semiconductor material is 800Ω. The sheet resistance if the dimensions of the material is 0.125µm wide and 1 mm long is?

A. 10 Ω/square
B. 0.01 Ω/square
C. 0.10 Ω/square
D. 1 Ω/square

Answer: C

We know that R=Rs(L/W).
Therefore Rs=R × W/L
Substituting the values of R, W and L, Rs is found to be 0.10 Ω/square.

9. The typical values of sheet resistance for the n-well semiconductor is ____________

A. 1-5 KΩ/square
B. 10-50 KΩ/square
C. 1-5 Ω/square
D. 100-500 Ω/square

Answer: A

The n-well semiconductors have high sheet resistance in the range of 1-5 KΩ/square.

10. The typical value of sheet resistance for polysilicon semiconductors is?

A. 15-30 Ω/square
B. 150-300 Ω/square
C. 1.5-3 KΩ/square
D. 0.15-0.3 Ω/square

Answer: A

The typical value of polysilicon semiconductors is 15-30 Ω/square.

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