Download GTU BE/B.Tech 2019 Winter 4th Sem New 2142406 Digital Electronics And Its Applications Question Paper

Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019

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Subject Code: 2142406
Date: 13/12/2019
Subject Name: Digital Electronics and its applications
Time: 10:30 AM TO 01:00 PM
Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Compute following in binary = 10 % (1010)₂ = ( )₂ [03]

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   2. Answer following with necessary computation. [04]
      1. (0011) Excess-3 =
      2. 1.L1IH=
   3. State logic families. Explain meaning of V_IH, V_OH, V_IL and V_OL. State these values for 5V CMOS logic. [07]

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2. 1. State universal gates. Draw implementation diagram of X= A+B function using universal gate. [03]
   2. Simplify function F(x,y,z) = Sm(3,7) using K Map. [04]
   3. Realize expression using minimum NOR gates only. [07]
      Y =AB'+AC'+C+ AD + AB'C + ABC

      OR

      Implement following using NAND gates only.
      

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      Y=(P+Q+R)(P'+Q+R')(P)
3. 1. Draw schematic diagram of 8:1 multiplexer circuit using two 4:1 multiplexer and necessary logic gates. [03]
   2. Explain why combinational logic alone cannot be used for processor implementation. [04]
   3. Design full subtractor circuit using decoder and required gates. [07]

      OR

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      A and B are two 2-bit numbers. Draw schematic diagram for magnitude comparator using 4 to 16 decoder which use A and B as inputs. Write output equations for (1) A>B (2) A=B (3) A
4. 1. Draw schematic diagram of 4-bit binary parallel subtractor. [03]
   2. Design a single digit BCD adder using 4-bit binary adders. [04]
   3. What are the differences between latch and flip-flop? [07]

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5. 1. Define state and state diagram. [03]
   2. Design synchronous 3-bit binary counter. [04]

      OR

      What is NOVA RAM?
   3. Compare SDRAM and DRAM. [07]

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6. 1. Design a circuit for 4-bit shift right register. [03]
   2. Is it necessary to use WRITE signal with ROM in application circuits? Justify your answer. [04]
   3. Define (1) Accumulator (2) ALU register [07]

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7. 1. What is micro program control of microprocessor? Explain the concept. [03]

      OR

      Construct D-flip flop using JK flip flop.
   2. Draw schematic of 2-bit ALU. [04]
   3. Explain concept of PLA control of microprocessor. [07]

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