MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Vlsi knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The Maximum and minimum output of the Differential amplifiers is defined as: |
| A. | Vmax = VDD, Vmin = -VDD |
| B. | Vmax = VDD, Vmin = Rd.Iss |
| C. | Vmax = VDD, Vmin = VDD – Rd.Iss |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 2. |
The inputs to the differential amplifier are applied at __________ |
| A. | At X and Y |
| B. | At the gates of M1 and M2 |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 3. |
The Differential output of the difference amplifier is the amplification of __________ |
| A. | Difference between the voltages of input signals |
| B. | Difference between the output of the each transistor |
| C. | Difference between the supply and the output of the each transistor |
| D. | All of the mentioned |
| Answer» B. Difference between the output of the each transistor | |
| 4. |
The difference output of the basic differential amplifier is taken at ___________ |
| A. | At X and ground |
| B. | At Y and ground |
| C. | Difference of the voltages at the gates of M1 and M2 |
| D. | Difference of the voltages between X and Y |
| Answer» E. | |
| 5. |
IN_THE_GRAPH_SHOWN_ABOVE,_WHAT_IS_A_AND_B:?$ |
| A. | a : Vout1, b : Vout2 |
| B. | a : Id1, b : Id2 |
| C. | a : Id2, b : Id1 |
| D. | a : Vout2, b : Vout1 |
| Answer» D. a : Vout2, b : Vout1 | |
| 6. |
What will be the output between X and Y:$ |
| A. | 0 as X=Y |
| B. | 2Vin1 as X = -Y |
| C. | 2Vout1 as X = -Y |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 7. |
In a small signal differential gain vs input CM level graph, the gain decreases after V2 due to? |
| A. | As the input voltage increases, the output will be clipped |
| B. | When the input voltage to the transistors are high, the transistor enters saturation region and increases the current, which inturn decreases the output voltage = VDD – Rd.Iss |
| C. | When Common Mode voltage is greater than or equal to V2, the input transistors enter triode region, the gain begins to fall |
| D. | Increasing the input voltage beyond V2 causes the gate oxide to conduct and the gain is reduced |
| Answer» D. Increasing the input voltage beyond V2 causes the gate oxide to conduct and the gain is reduced | |
| 8. |
In Common Mode Differential Amplifier, the outputs Vout1 and Vout2 are related as: |
| A. | Vout2 is in out of phase with Vout1 with same amplitude |
| B. | Vout2 and Vout1 have same amplitude but the phase difference is 90 degrees |
| C. | Vout1 and Vout2 have same amplitude and are in phase with each other and their respective inputs |
| D. | Vout1 and Vout2 have same amplitude and are in phase with each other but out of phase with their respective inputs |
| Answer» E. | |
| 9. |
The Maximum and minimum output of the Differential amplifiers is defined as : |
| A. | Vmax = VDD, Vmin = -VDD |
| B. | Vmax = VDD, Vmin = Rd.Iss |
| C. | Vmax = VDD, Vmin = VDD – Rd.Iss |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 10. |
Differential input output characteristics is given by: |
| A. | |
| B. | a : VDD, b : -VDD |
| C. | a : VDD – R.Iss, b : -VDD + R.Iss |
| Answer» D. | |
| 11. |
In the above graph the a and b represents: |
| A. | a : Vout1 , b : Vout2 |
| B. | a : Vout2 , b : Vout1 |
| C. | a : Vout1-Vout2 , b : Vout2-Vout1 |
| D. | None of the mentioned |
| Answer» C. a : Vout1-Vout2 , b : Vout2-Vout1 | |
| 12. |
The above graph is drawn between __________ vs _______________ |
| A. | X axis: difference of input voltage, Y axis: Difference of output voltage |
| B. | X axis: difference of input voltage, Y axis: Output voltage of each transistor separately |
| C. | X axis: difference of input voltage, Y axis: Sum of both output voltage |
| D. | None of the mentioned |
| Answer» C. X axis: difference of input voltage, Y axis: Sum of both output voltage | |
| 13. |
The inputs to the differential amplifier are applied at: |
| A. | At X and Y |
| B. | At the gates of M1 and M2 |
| C. | Both the mentioned |
| D. | None of the mentioned |
| Answer» C. Both the mentioned | |
| 14. |
The Differential output of the difference amplifier is the amplification of: |
| A. | Difference between the voltages of input signals |
| B. | Difference between the output of the each transistor |
| C. | Difference between the supply and the output of the each transistor |
| D. | All of the mentioned |
| Answer» B. Difference between the output of the each transistor | |
| 15. |
The difference output of the basic differential amplifier is taken at: |
| A. | At X and ground |
| B. | At Y and ground |
| C. | Difference of the voltages at the gates of M1 and M2 |
| D. | Difference of the voltages between X and Y |
| Answer» E. | |