Wednesday, February 27, 2013

Important Digital Design Interview questions

  1. Design all Combinational Gates Using 2:1 Mux
  2. Design full adder using 2:1 and 4:1 Mux
  3. Design Half adder using 2:1 and 4:1 Mux 
  4.  Design full subtractor using 2:1 and 4:1 Mux 
  5. Design Half subtractor using 2:1 and 4:1 Mux 
  6.  Design D-latch and D-Flip Flop using 2:1 Mux 
  7. Design a counter in such a way that  0,0,1,1,2,2,3,3 
  8.  Design a counter in such a way that
            0, 1,2,3,4,0,5,6
            0,1,2,3,4,1,5,6 
            0,1,2,3,4,2,5,6 
            0,1,2,3,4,3,5,6 
            0,1,2,3,4,4,5,6 
                  0,1,2,3,4,5,5,6

         9. Design a counter in such a way that 0,3,1,2,2,1,3,0
         10.Count no. of 1’s in 8 bits using only combinational circuit
         11. Design a 1- bit comparator using 4:1 MUX   
         12. Design a 4- bit comparator using 4:1 MUX 
            13. Draw the waveforms of Qa and Qb

 
       


  14. Design a counter in such a way that it has to count 
       20 --> 23 --> 41 --> 30 --> then again 20 and so on cycle continues
It means it has to count 20 clock cycles first then make to 0 and then count 23 cycles and should make to 0… so on….

15.How can u find the largest number out of 100 elements? Write a C Code  ?
      16. Simplify : AC’+AB’+BC’  
      17.      How many 2:1 Mux are used to implement inverter? So that how many 2:1 Mux are used to implement XOR?
      18.What is set up time and hold time? Does the D-latch have Set-up time 
      19. Draw D-latch using MUX 
      20. What is clock-gating? What is effect of clock-gating
      21. Convert D-FF to T-FF
      22. Draw PD flow, ASIC flow
      23. Write the boolean equation for: 
       24. Draw the inverter characteristics
       25.In ASCII Number, 3A is subtracted from 4A? What is the range of Address locations? How many bits are used to store this range?

       26.  Draw the Circuit for this waveform?  
         

       27.Write a verilog   code to calculate the frequency of the below waveform?
        

    
      28.Draw the Circuit for this waveform?
          

        29.Will the Circuit Oscillate?  If Yes, What is the time period of one cycle?
      


 

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