250+ TOP MCQs on Biasing in MOS Amplifier Circuit and Answers

Electronic Devices and Circuits Problems on “Biasing in MOS Amplifier Circuit”.

(Q.1-Q.2) A discrete MOSFET common source amplifier has R_in = 2 MΩ, g_mm = 4mA/V, r_o = 100 kΩ, R_D = 10 kΩ, C_gs = 2pF and C_gd = 0.5pF. The amplifier is fed from a voltage source with an internal resistance of 500 kΩ and Is connected to the a load of 10 kΩ.

1. The value of the overall mixed gain A_M is
A. -15.2 V/V
B. -16.2 V/V
C. -17.2 V/V
D. -18.2 V/V

2. The upper 3-db frequency f_H is
A. 11.1 kHz
B. 22.1 kHz
C. 33.1 kHz
D. 44.1 kHz

4. Find the value of C_S that places F_L at 10Hz
A. 6.57 µF
B. 12.57 µF
C. 18.57 µF
D. 24.57 µF

5. Find A_M
A. 1.02 V/V
B. 2.04 V/V
C. 3.06 V/V
D. 4.08 V/V

6. Find f_H if C_gs = 1 pF and C_gd = 0.2 pF.
A. 875 kHz
B. 875 kHz
C. 875 kHz
D. 875 kHz

7. What is the drain current that flows
A. 104 µA
B. 208 µA
C. 312µA
D. 416 µA

8. What is the value of the drain current if both L and W are doubled?
A. 408 µA
B. 412 µA
C. 416 µA
D. 420 µA

10. In which region is the triode operating?
A. Triode region
B. End of saturation region
C. Saturation region
D. None of the mentioned