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Total No. of Pages : 02

Total No. of Questions : 09

B.Tech.(?) (2011 & Onwards) (Sem.-4)

DIGITAL ELECTRONICS

Subject Code : EC-204

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M.Code: 57011

Time: 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :

1. Covert the binary number 1011001011 into (a) octal (b) hexadecimal
2. Convert gray code 101011 into its binary equivalent?

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3. Subtract (111001)₂ from (1001)₂ using 2's compliment method?
4. What do you mean by positive and negative logic?
5. Draw the logic diagram for logic equation Y = (A + B).C.
6. Give the comparison between PROM and PLA.
7. What is race around condition in flip-flops?

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8. The tpd for each flip-flop is 50 ns determine the maximum operating frequency MOD-32 ripple counter?
9. Give the specifications of A/D converters?
10. Why totem pole outputs cannot be connected together?

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SECTION-B

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2. Simplify the given logic equation using Boolean algebra.

Y = P + PQR + Q+R

3. Minimize the following using K-map

f₁(w,x, y, z) = S(0,1,5,7,8,14)+Sd(2,11)

and implement the minimized function using only NAND gates.

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4. Explain the principle of operation of a dual slope ADC. How is it advantageous over ramp type ADC?

5. Explain the working of a full subtractor with neat diagram and truth table.

6. Draw the circuit diagram of a 4-bit serial in/serial out shift register using D flip-flops. Also draw its timing diagram.

7. Explain the basic circuits of ECL and tristate logic. Compare TTL and ECL with respect to fan-in, fan-out, noise margin and propagation delay time.

8. a) Explain the operation of successive approximation type of ADC.

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b) If Q output of a D type flip-flop is connected to D input, it acts as a toggle switch verify?

9. Write short notes on Any Two :

1. SR flip-flop
2. PLA
3. Gray code and Excess-3-code.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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