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Quiz: EDC-Basics of IC bipolar , MOS & CMOS types

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Number of Questions: 20

Question: 6 -

Which one of the following statements is correct ? For an MOS capacitor fabricated on a p-type occurs when surface potential is

Options:

  1. Equal to fermi potential

  2. Positive and equal to fermi potential in magnitude

  3. Zero

  4. Negative and equal to fermi potential in magnitude

    5. Answer:

    Negative and equal to fermi potential in magnitude
    Solution:

    When surface potential is negative and equal to fermi level , then it is said that strong inversion has been occurred

Question: 7 -

In integrated circuits , the design of electronic circuits is based on the approach of use of

Options:

  1. Larged size capacitor

  2. Minimum chip area irrespective of the type of components in the design

  3. Use of only bipolar transistors

  4. Maximum number of resistors in the circuit

    5. Answer:

    Minimum chip area irrespective of the type of components in the design
    Solution:

    In IC design minimum area is main criteria

Question: 8 -

Why is silicon dioxide (SiO2) layer is used in ICs?

Options:

  1. Because it facilitates the penetration of the desired impurity by diffusion

  2. To control the concentration of te diffused impurities

  3. Because of its high heat conduction

  4. To protect the surface of the chip from external contaminants and to allow for selective formation of the n and p regions by diffusion

    5. Answer:

    To protect the surface of the chip from external contaminants and to allow for selective formation of the n and p regions by diffusion
    Solution:

    Sio2 is used an insulator

Question: 9 -

What is correct sequence of the following step in the fabrication of a monolithic , bipolar junction transistor ?

1) Emitter diffusion

2) Base diffusion

3) Buried-layer formation

4) Epi-layer formation

Select the correct answer using the codes given below :-

Options:

  1. 3,4,1,2

  2. 4,3,1,2

  3. 4,3,2,1

  4. 3,4,2,1

    5. Answer:

    4,3,2,1
    Solution not available.

Question: 10 -

In the fabrication of n - p - n transistor in an IC , the buried layer on the p-type substrate is

Options:

  1. p+ doped

  2. Used to reduce the parasitic capacitance

  3. Located in the emitter region

  4. n+ doped

    5. Answer:

    Used to reduce the parasitic capacitance
    Solution:

    The buried layer on p-type substrate is used to reduce parasites capacitance