MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Neglecting Channel Length Modulation, if the transconductance of a MOSFET increases, the output impedance of the follower stage can _________ |
| A. | increase |
| B. | decrease |
| C. | increase linearly |
| D. | decrease non-linearly |
| Answer» C. increase linearly | |
| 2. |
Neglecting Channel Length Modulation, if the transconductance increases, the input impedance of a follower stage ___________ |
| A. | Remans the same |
| B. | Increases |
| C. | Decreases |
| D. | Doubles |
| Answer» B. Increases | |
| 3. |
Neglecting Channel Length Modulation, if the aspect ratio of the MOSFET increases, the gain of the follower stage will _________ |
| A. | increase |
| B. | decrease |
| C. | increases proportionately |
| D. | doesn’t get affected |
| Answer» B. decrease | |
| 4. |
Neglecting Channel Length Modulation, if the transconductance of the MOSFET increases, the gain of the follower stage will _________ |
| A. | decreases |
| B. | increases |
| C. | doesn’t get affected |
| D. | doubles |
| Answer» C. doesn’t get affected | |
| 5. |
If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if both M1 and M3 has channel length modulation? |
| A. | R / ((1/g || r) + R) * g * R * R / ((1/gm || r)) |
| B. | R / ((1/g + 4R) * g * R / ((1/g || r) + 3R) |
| C. | R / ((1/g || r)) * g *R * R / ((1/g || r) + 2R) |
| D. | R / ((1/g) * R * R * g * 4g |
| Answer» B. R / ((1/g + 4R) * g * R / ((1/g || r) + 3R) | |
| 6. |
If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if both M2 and M3 has channel length modulation? |
| A. | R/ ((1/g || r) + R) * g * (R || r) * R * g |
| B. | R/ ((1/g + R) * g * (R || r) * R/ ((1/g || r) + R) |
| C. | R/ ((1/g || r)) * g *R * R/ ((1/g || r) + R) |
| D. | R/ ((1/g ) + R) * g *R * R *2g |
| Answer» C. R/ ((1/g || r)) * g *R * R/ ((1/g || r) + R) | |
| 7. |
If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if only M1 has channel length modulation? |
| A. | R / ((1/g || r ) + R) * g *R * R / (1/g + R) |
| B. | R / ((1/g || r ) + R) * g *R * R * g |
| C. | R / ((1/g || r )) * g *R * R / (1/g + R) |
| D. | R / ((1/g ) + R) * g *R * R / (1/g + R) |
| Answer» B. R / ((1/g || r ) + R) * g *R * R * g | |
| 8. |
If maximum power is transferred to the load R1, the transconductance is .02 and channel length modulation is neglected, what should be the value of the load? |
| A. | 50 Ω |
| B. | 32 Ω |
| C. | 16 Ω |
| D. | 10 Ω |
| Answer» B. 32 Ω | |
| 9. |
Assume µnCox = 100 µA/V2 and supply current is 5mA, what should be the aspect ratio so that a 50 Ω load can be used to give a voltage gain of .25 in C.D. configuration? |
| A. | 32.6 |
| B. | 50 |
| C. | 40 |
| D. | 41 |
| Answer» B. 50 | |
| 10. |
The follower stage is mostly used as a ____________ |
| A. | Current source |
| B. | Buffer stage |
| C. | Amplifier |
| D. | Switch |
| Answer» C. Amplifier | |
| 11. |
The output impedance of the follower is _____________ |
| A. | Low |
| B. | Very low |
| C. | Depends on it’s transconductance and low |
| D. | High |
| Answer» D. High | |
| 12. |
The follower stage provides _____ input impedance. |
| A. | low |
| B. | equal |
| C. | very high |
| D. | very low |
| Answer» D. very low | |
| 13. |
If channel length modulation is present in M1 but not in M2, what is the voltage gain at node X? |
| A. | (1/gm2 || ro2) / {1/gm2 + ( 1/gm1 || ro1)} |
| B. | (1/gm1 || ro1) / (1/gm2 + ro1) |
| C. | 1/gm1 / (1/gm2 + 1/gm1) |
| D. | 1/gm1 / {1/gm2 + (1/gm1 || ro1)} |
| Answer» B. (1/gm1 || ro1) / (1/gm2 + ro1) | |
| 14. |
If channel length modulation is present, what is the impedance looking into node X? |
| A. | (1/gm2 || ro2 || 1/gm1) |
| B. | (1/gm2 || 1/gm1 || ro1) |
| C. | (1/gm2 || ro2 || 12/gm1 || ro1) |
| D. | (1/gm2 || ro2 || 1/gm1 || ro1) |
| Answer» E. | |
| 15. |
If channel length modulation is present, what is the voltage gain? |
| A. | ro1 / {(1/gm1 || ro2) + ro1} |
| B. | ro2 / (1/gm1 + ro1) |
| C. | ro2 / (1/gm1 + 3ro2) |
| D. | ro2 / (2/gm1 + ro2) |
| Answer» B. ro2 / (1/gm1 + ro1) | |