25 March 2020

Logic Families Interview Question Answer - 4



46
Write the application of the ECL.


Application of ECL
  • Super fast computer
  • High speed applications


47
Why the ECL gates can be wired ORed?


When the ECL is wired ORed, the noise spikes are not generated and complementary output is possible.

48
Give reason ‘The fan out of the ECL is large’.


The fan out of the ECL is large due to low output impedance.

49
Why the inverters do not requires in the ECL?


The ECL do not requires inverters because it produces the output and its complement.

50
Write three features of the ECL.


Features of the ECL
  • High speed
  • Less noise margin
  • Large fan out
  • Spikes are not generated


51
What is unit of noise margin?


The noise margin is represented in milli voltage.

52
Describe the advantage of the differential input ECL.


The advantage of the differential input ECL is that it provides common mode rejection.

53
Which logic family requires level translator?


ECL

54
What is reason behind the name ‘MOS logic’?


Because it uses metal oxide field effect transistor in the logic circuit.

55
Describe the advantages and disadvantages of MOS logic family over Bipolar logic family.


Advantages
  • Simple
  • Easy to fabricate
  • Less power requires
  • Better noise margin
  • High fan out
  • Wide range of supply voltages
  • It requires less chip area

Disadvantages
  • It may be damage due to static charge.
  • Slow operating speed
  • Large propagation delay


56
Why the propagation delay of the MOS logic is very large?


The propagation delay of the MOS logic is very large due to capacitive loading by driven gates and high output resistance.

57
Why the MOS logic is simplest to fabricate?
               OR
Why the MOS logic is used for LSI, VLSI and ULSI application?


The MOS logic is used for LSI, VLSI and ULSI application because of
  • Simplest to fabricate
  • It occupies less space.
  • It requires only one element i.e. NMOS or PMOS transistor
  • Low power dissipation per gate


58
Why the MOS logic is not used for SSI and MSI application?


Speed of MOS Logic
  • The operating speed of the MOS is slower than that of the TTL therefore the MOS logic is not used for SSI and MSI applications.


59
State the application of the MOS logic.


Application of MOS logic
  • Calculator chips
  • Large microprocessor
  • Large memories


60
Give reason : The MOS logic may be  damaged by static charges.


The MOS logic may be damaged by static charge due to high impedance of the MOSFET’s input.


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