MOSFET Amplifier with CS Configuration – 2 MCQ’s

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This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “MOSFET Amplifier with CS Configuration – 2″.

1. Neglecting Channel Length Modulation, what is the output impedance of the following C.S. stage?


a) R4
b) R4 || R2
c) R4 || (R2 + R3)
d) R4 || [(R2 + R3) || R1]

2. In the following C.S. stage, what is the gate voltage appearing across M1?


a) V1 * [(R2 || R3) / (R1 || R2 || R3)]
b) V1 * [(R2 + R3) / {R1 + R2) || R3}]
c) V1 * [(R2 + R3) / (R1 + R2 + R3)]
d) V1 * [(R2 || R3) / {R1 + (R2 ||R3}]

3. What is the input impedance of the following C.S. stage?


a) R2 || R3
b) R1 || (R2 + R3)
c) (R1 || R2) + R3
d) R1 + (R2 || R3)

4. If we have 3 resistors of 1k, 2k and 3k, how should they be used amongst R1, R2 and R3 to get the maximum gate voltage in the following C.S. stage?


a) R1 = 1k, R2 = 2k, R3 = 3k
b) R1 = 3k, R2 = 2k, R3 = 1k
c) R1 = 2k, R2 = 1k, R3 = 3k
d) R1 = 3k, R2 = 1k, R3 = 2k

5. If an NMOS is degenerated by a resistor in series with the source, what will happen to the output resistance?
a) It increases
b) It decreases
c) It remains same
d) Cannot be determined

6. If Vth is .45V, what is the output voltage for the following C.S. stage?


a) 4.7 V
b) 3.9 V
c) 2.1 V
d) 3.5 V

7. Coupling capacitors provide D.C. coupling during biasing of transistors.
a) True
b) False

8. What is the output voltage in the following C.S. stage?


a) 5 V
b) 0 V
c) 2.5 V
d) 3 V

9. What is the role of the capacitor in the following circuit?


a) Increasing the gain
b) Decreasing the gain
c) Has not role
d) Decreases the output impedance

10. If 12µnCox*(W/L) = K and λ=0 for the C.S. stage shown below, what is the voltage gain (ideally)?


a) (R2 || R3 || R4) * 3K * (V1 – 2Vth)
b) (R2 || R3 || R4) * K * (V1 + Vth)
c) (R2 || R3 || R4) * 2K * (V1 – Vth)
d) (R2 || R3 || R4) * K * (V1 – Vth)

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