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. |
If Channel Length Modulation is present and gm is the transconductance of M1, what happens to the output resistance of for a fixed V2 in the following circuit? |
| A. | (1 + (gm * ro)) * Rs + ro |
| B. | (1 + (gm * ro)) * ro + Rs |
| C. | (ro + 2) * Rs |
| D. | (1 + (gm * ro)) * Rs |
| Answer» B. (1 + (gm * ro)) * ro + Rs | |
| 2. |
If the internal resistance of the current source is finite, what will happen to the voltage gain. for the following C.S. stage, if K is doubled? |
| A. | The voltage gain reduces by 1/2 |
| B. | The voltage gain remains the same |
| C. | The voltage gain increases |
| D. | The voltage gain decreases |
| Answer» C. The voltage gain increases | |
| 3. |
If both the MOSFET’s are identical and have channel length modulation, what is the output impedance at node S? |
| A. | R1 || ro1 || ro2 |
| B. | R1 + (ro1 || ro2) |
| C. | R1 + (ro1 + ro2) |
| D. | R1 || (ro1 + ro2) |
| Answer» B. R1 + (ro1 || ro2) | |
| 4. |
If both the MOSFET’s are identical, what is the voltage gain from V1 to node S? |
| A. | Vcc – 2R1 * µn Cox * (W/L) * (V1-Vth)2 |
| B. | Vcc R1 * \(\frac{1}{2}\)µn Cox (W/L) * (V1-Vth)2 |
| C. | Vcc – R1 * µn Cox (W/L) * (V1-Vth)2 |
| D. | Vcc – 4R1 * \(\frac{1}{2}\)µn Cox * (W/L) * (V1-Vth)2 |
| Answer» D. Vcc – 4R1 * \(\frac{1}{2}\)µn Cox * (W/L) * (V1-Vth)2 | |
| 5. |
If the transconductance of M1 is 5S, voltage gain for the following degenerated CS stage is _____ |
| A. | 2.45 |
| B. | 1.25 |
| C. | 1.45 |
| D. | 2.25 |
| Answer» C. 1.45 | |
| 6. |
If the output impedance of the current source is Ri, what is the output impedance of the CS stage shown below, if channel length modulation is neglected? |
| A. | (1 + gm * (R1 || R2)) * Ri + (R1 || R2) |
| B. | {R1 * (R2 + ro)} || Ri |
| C. | R1 || R2 |
| D. | 0 |
| Answer» B. {R1 * (R2 + ro)} || Ri | |
| 7. |
What is the overall input resistance of the CS stage shown below? |
| A. | R3 |
| B. | R3 || R1 |
| C. | 2 * R3 |
| D. | Infinite |
| Answer» B. R3 || R1 | |
| 8. |
If the output voltage is sensed at the collector, which of the following option perfectly describes the stage shown below? |
| A. | A degenerated C.S. stage |
| B. | A C.S. stage |
| C. | A shunted C.S. stage |
| D. | An open C.S. stage |
| Answer» B. A C.S. stage | |
| 9. |
In the following C.S. stage shown below, what is the voltage gain from the gate to the drain of M1 if λ>0? |
| A. | gm * ro |
| B. | gm * 2R1 |
| C. | gm * R1||ro |
| D. | gm * R1 |
| Answer» D. gm * R1 | |
| 10. |
In the following C.S. stage shown below, what is the output impedance, if channel length modulation is neglected? |
| A. | 2ro |
| B. | 5 |
| C. | R1 |
| D. | 0 |
| Answer» D. 0 | |
| 11. |
In the following C.S. stage shown below, what is the output impedance if λ>0? |
| A. | ro |
| B. | 0 |
| C. | R1 |
| D. | R1 || ro |
| Answer» E. | |
| 12. |
In the following C.S. stage shown below, what is the input impedance if λ>0? |
| A. | Infinite |
| B. | 0 |
| C. | Very low |
| D. | ro |
| Answer» B. 0 | |
| 13. |
In the following C.S. stage shown below, what is the input impedance (ideally) if channel length modulation is neglected? |
| A. | Infinite |
| B. | Very high |
| C. | Very low |
| D. | Cannot be determined |
| Answer» B. Very high | |
| 14. |
In the following C.S. stage shown below, what is the transconductance? |
| A. | \(\frac{1}{2}\)µnCox*(W/L)(V1-Vth) |
| B. | 3µnCox*(W/L)(V1-Vth) |
| C. | µnCox*(W/L)(V1-Vth) |
| D. | 2µnCox*(W/L)(V1-Vth) |
| Answer» B. 3µnCox*(W/L)(V1-Vth) | |
| 15. |
Neglecting Channel Length Modulation, what is the voltage gain from the gate to the drain of M1? |
| A. | gm * R1 |
| B. | gm * 2R1 |
| C. | gm * R1 || RO |
| D. | 3gm * R1 |
| Answer» B. gm * 2R1 | |