Electronic Devices and Circuits Questions and Answers – MOSFETs Circuits at DC

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “MOSFETs Circuits at DC”.

1. The transistor in the circuit shown below has k_n = 0.4 mA/V², V_t = 0.5 V and λ = 0. Operation at the edge of saturation is obtained when

a) (W/L)R_D = 0.5 kΩ
b) (W/L)R_D = 1.0 kΩ
c) (W/L)R_D = 1.5 kΩ
d) (W/L)R_D = 2.0 kΩ
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2. The PMOS transistor in the circuit shown has V_t = −0.7 V, μ_pC_ox = 60 μA/V², L = 0.8 μm, and λ = 0. Find the value of R in order to establish a drain current of 0.115 mA and a voltage V_D of 3.5 V.

a) 12.5 KΩ
b) 25 kΩ
c) 37.5 kΩ
d) 50 kΩ
View Answer

Answer: a
Explanation:

3. The NMOS transistors in the circuit shown have V_t = 1 V, μ_nC_OX = 120 μA/V², λ = 0, and L₁ = L₂ = L₃ = 1μm. Then which of the following is not the value of the width of these MOSFETs shown
a) 2 µm
b) 8µm
c) All of the mentioned
d) None of the mentioned
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Answer: d
Explanation:

4. The MOSFET shown has Vt = 1V, k_n = 100µA/V² and λ = 0. Find the required values of W/L and of R so that when v_I = V_DD = +5 V, r_DS = 50 Ω, and V_O = 50 mV.

a) W/L = 25 and R = 4.95 kΩ
b) W/L = 25 and R = 9.90 kΩ
c) W/L = 50 and R = 4.95 kΩ
d) W/L = 50 and R = 9.90 kΩ
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Answer: c
Explanation:

5. For each of the circuits shown find the labeled voltages. For all transistors, k_n(W/L) = 1 mA/V2, V_t = 2V, and λ = 0. Find V₃

a) 2.41V
b) 3.41V
c) 4.41V
d) 1.41V
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6. For each of the circuits shown find the labeled voltages. For all transistors, k_n(W/L) = 1 mA/V2, V_t = 2V, and λ = 0. Find V₄ and V₅

a) 4V and -5V respectively
b) -4V and 5V respectively
c) 4V and 5V respectively
d) -4V and -5V respectively
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Answer: a
Explanation:

7. For each of the circuits shown find the labeled voltages. For all transistors, k_n(W/L) = 1 mA/V2, V_t = 2V, and λ = 0. Find V₁ and V₂
a) 2V and -4V
b) -2V and 4V
c) 2V and 4V
d) -2V and -4V
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8. For each of the circuits shown find the labeled node voltages. The NMOS transistors have V_t = 1 V and k_n( W/L ) = 2 mA/V₂ and λ = 0. Find V₁ and V₂

a) 2.44 and -1.28 V
b) 2.44 and -2.56 V
c) 1.22 and -2.56 V
d) 1.22 and -1.28 V
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Answer: b
Explanation:

9. For each of the circuits shown find the labeled node voltages. The NMOS transistors have V_t = 1 V and k_n( W/L ) = 2 mA/V₂ and λ = 0. Find V₃ and V₄

a) 3.775V and 5V
b) 3.775V and 2.55V
c) 7.55V and 2.55V
d) 7.555V and 5V
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Answer: d
Explanation:

10. For the PMOS transistor in the circuit shown k_n= 8 µA/V², W/L = 25,|V_tp| = 1V and I = 100μA. For what value of R is V_SD = V_SG?

a) 0 Ω
b) 12.45 kΩ
c) 25.9 kΩ
d) 38.35 kΩ
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Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

To practice all areas of Electronic Devices and Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.