MCQOPTIONS
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MCQOPTIONS
This section includes 6 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 expression for threshold voltage for the enhancement mode nMOSFET is: |
| A. | gc-2 f-Qbo/Cox-Qox/Cox |
| B. | gc+ f-Qbo/Cox |
| C. | gc- f-Qbo/Cox+Qox/Cox |
| D. | gc+2 f-Qbo/Cox-Qox/Cox |
| Answer» B. gc+ f-Qbo/Cox | |
| 2. |
The Energy band diagram of MOS system when gate voltage is equal to threshold voltage is: |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11a.png"><img alt="Energy band diagram of MOS system when gate voltage is equal to threshold voltage - option a" class="alignnone size-full wp-image-162172" height="104" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11a.png" width="215"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11b.png"><img alt="Energy band diagram of MOS system when gate voltage is equal to threshold voltage - option b" class="alignnone size-full wp-image-162173" height="127" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11b.png" width="215"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11c.png"><img alt="Energy band diagram of MOS system when gate voltage is equal to threshold voltage - option c" class="alignnone size-full wp-image-162175" height="121" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11c.png" width="216"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11d.png"><img alt="Energy band diagram of MOS system when gate voltage is equal to threshold voltage - option d" class="alignnone size-full wp-image-162176" height="147" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11d.png" width="225"/></a> |
| Answer» D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11d.png"><img alt="Energy band diagram of MOS system when gate voltage is equal to threshold voltage - option d" class="alignnone size-full wp-image-162176" height="147" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q11d.png" width="225"/></a> | |
| 3. |
The threshold voltage depends on: |
| A. | The workfunction difference between gate and channel |
| B. | The gate voltage component to change surface potential |
| C. | The gate voltage component to offset the depletion charge and fixed charges in gate oxide |
| D. | All of the mentioned |
| Answer» E. | |
| 4. |
For enhancement mode n-MOSFET, the threshold voltage is: |
| A. | Equal to 0 |
| B. | Greater than zero or Positive quantity |
| C. | Negative voltage or lesser than zero |
| D. | All of the mentioned |
| Answer» C. Negative voltage or lesser than zero | |
| 5. |
The energy band diagram of the MOS system when gate voltage is zero is: |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8a.png"><img alt="Energy band diagram of MOS system when gate voltage is zero - option a" class="alignnone size-full wp-image-162168" height="104" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8a.png" width="215"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8b.png"><img alt="Energy band diagram of MOS system when gate voltage is zero - option b" class="alignnone size-full wp-image-162169" height="126" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8b.png" width="215"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8c.png"><img alt="Energy band diagram of MOS system when gate voltage is zero - option c" class="alignnone size-full wp-image-162170" height="127" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8c.png" width="215"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8d.png"><img alt="Energy band diagram of MOS system when gate voltage is zero - option d" class="alignnone size-full wp-image-162171" height="147" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8d.png" width="225"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8b.png"><img alt="Energy band diagram of MOS system when gate voltage is zero - option b" class="alignnone size-full wp-image-162169" height="126" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-mos-threshold-voltage-q8b.png" width="215"/></a> | |
| 6. |
Consider a MOS structure with equilibrium Fermi potential of the doped silicon substrate is given as 0.3eV. Electron affinity of Si is 4.15eV and metal is 4.1eV. Find the built in potential of the MOS system. |
| A. | -0.8eV |
| B. | 0.8eV |
| C. | 0.9eV |
| D. | -0.9eV |
| Answer» E. | |