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R.G.P.V. Bhopal (MP)

B.E. (4th Semester) EXAM,Dec-2010

DIGITAL ELECTRONICS [ EC-403(N) ]

Time:3 Hrs     Max Marks:100     Min Marks:35

Note:- Attempt any five question . All questions carry equal marks.

UNIT-I 

Q.1 (a) Describe the method of  gray to binary and binary to gray conversion? With suitable example?10

       (b) Do as directed : 10

                 (i)  (A6F)H= (?)8= (?)gray

                (ii) (256)10= (?)2421=(?)BCD

OR

Q.2 (a) Explain the Universal gates with the suitable example? 10

         (b)minimize the following expression using K-Map and realize with NAND gates?10

  F(A,B,C,D)=? m(2,3,6,7,8,9,10,11,12,13,14,15)
UNIT-II 

Q.3(a)Design A full Substractor & derive the expression for output & realize iT with NAND  gates? 10 

       (b) Explain the Operation of  look ahead carry generator? 10

OR

Q.4.(a)Draw and explain the half substractor using NOR gates only? 10 

        (b) Draw and explain the BCD adder circuits? 10

UNIT-III

Q.5(a).Write short notes on Astable multivibrator using transistor? 10

      (b)Draw the circuit of TTL with totem-pole output & verify that it perform NAND operation?10

OR

Q.6(a)Write short notes on bistable multivibrator using transistors? 10

      (b)Write short notes on MOS logic family?also explain PMOS,NMOS,and CMOS?10

UNIT-IV

Q.7(a)explain the working of Master-slave JK Flip-Flop?10

       (b).Write short notes on semiconductor memories? 10

OR

Q.8(a). Write short notes on(any two) 5 each

             (i). PLAs
            (ii) PALs
           (iii) EEPROM
           (iv) Multiplexer Tree

      (b). Design the circuit using 8:1 multiplexer ?10

      F(A,B,C,D)= ?m (0,2,4.,56,8,,9,11,12,13,14)

UNIT-V

Q.9(a).Write short notes on  edged triggered SR-flip flop ? 10

       (b) Differentiate between latch and flip-flop? 10

OR

Q.10 (a).Write short notes on?  10

             (i)  Fan-In-Fan-Out
            (ii) Noise Margin
           (iii) Speed of Operation
           (iv) Power dissipation

(b) Explain the working of  CMOS NAND and CMOS-NOR ?10

 

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