## Digital Circuit And Logic Design Question Paper of 3rd Semester ECE16 Download Previous Years Question Paper 2

• Thursday, September 08, 2016

Roll No.
Total No. of Questions : 09
B.Tech. (ECE/ETE) (Sem.–3)
DIGITAL CIRCUIT AND LOGIC DESIGN
Subject Code : BTEC-302
Paper ID : [A1131]
Time : 3 Hrs.
INSTRUCTION TO CANDIDATES :
INSTRUCTIONS TO CANDIDATE:
1. Section –A, is Compulsory.
2. Attempt any four questions from Section-B.
3. Attempt any two questions from Section-C.

Section A

Ql. a) If A= (101)2 , B= (110)2,find A-B.

b) Convert Y= ∑m (l,3,5) into Standard SOP and POS form

c) Implement half adder using NAND gates

d) Compare synchronous counters and asynchronous counters.

e) What is a Register? Give its ‘different types.

f) Define i) Noise Margin i) Fan in.

g) List various types of RAM and ROM.

h) Which type of circuit is used for edge triggering? Give its arrangement for positive and negative triggering.

i) A counter type A/D converter contains a 4 bit binary ladder and is driven by 2 MHz clock calculate conversion rate and resolution?

j) Explain: PAL and PLA.
Section B

Q2. A combinational circuit has 3 inputs A,B and C and output F. F is true for following input                    combinations:

A is False and B is True; A is False and C is True; A, B, C are False; A,B, C are True.

a) Write the Truth. Table for F

b) Write the simplified expression for F in SOP form and POS form

c) Draw the logic circuit using NOR gates.

Q3. a) Implement Y(A,B,C,D) = ∑m (1,3,5,7,9,1,14) using 4:1 MUX.

b) Design 4x16 decoder with 2x4 decoder.

Q4. a) Convert SR to D flip flop

b) Explain briefly how Race around conditon in flip flop is avoided

Q5. Discus different specifications of A/D converter.

Q6. What is a memory cel? Discus different RAM cells and ROM cells.

Section-C

Q7. Simplify the following functions using K map and implement he circuit using NAND gates only:

(a) Y = ∑m(2,3,4,5,13,15) + ∑d(8,9,10,l 1)

(b) S = ∑ m (1, 5, 7, 8, 9, 10, 1, 14, 15)

Q8. With neat diagram explain the working of

a) 4 bit serial in serial out shift register

b) 2 bit Asynchronous Ripple Up counter

Q9. Discus MOS logic family in brief.