""~ll No. ...................... -~ Total No. of Questions:

Paper ID [EC204]

09]

[Total No. of,Pages: 02

(please fill this Paper ID in OMR Sheet)

B. Tech. (Semester DIGIT AL ELECTRONICS

- 4th)

(EC

~

204) Maximum Marks: 60

rime: 03 Hours Instruction

to candidates:

1)

Section - A is compulsory.

2)

Attempt any Four questions from, Section - B.

3)

Attempt any Two questions from Section - C.

Section - A (10 x 2

=20)

Ql) a)

The need to study octal & hexadecimal machine understands only binary code.

system, when the Digital

b)

Where do we use ASCII, Excess-3 & Grey codes?

c)

How many select lines are there for a 30 to 1 MUX?

d)

Difference between combinational & sequential circuits.

e)

Features of content addressable memories.

f)

What is the Mod of 6 bit Ring Counter?

g)

List the various type of AID coverters.

h)

Where do we use PLA's?

i)

What are the various type of parity checkers and where do we use them?

j)

Convert decimal 27.125 to octal. Section - B

(4 x 5 Q2) If A

= 1101 and

(i} A + (ii) A- -

B B

(iii) B - A (iv) A x B

J-672

B

= 20)

= 101 find

by 2'S complement method. .

P.T.D.

.~

--~

Q3) Discuss the comparison of the important features of various IC logic families.Q4) Draw the circuit of an S-R flipflop using NAND gates. Modify it to include clock. Derive J-K circuit from S-R flipflop circuit & explain its,truth table. Q5) (i)

Make a K-map for the function: f

= AB + AC

+ C + AD + ABC + ABC

(ii) Express f in standard SOP form. . , (iii) Minimize it and realize the minimized expression using NAND gates only. .

Q6) Draw the circuit of a counter type AID converter and explain its operation. Section - C

(2 x 10

=20)

Q7) Draw the circuit of Totem pole NAND gate and explain its operation. Explain ,

why these cannot be wire ANDed?

Q8) (a) What are the various type of ROM's? Discuss their relative advantages and disadvantages. .

(b) Draw the circuit of a static MaS RAM cell and explain its operation of Read and Write. Q9) Write notes on any two of the followings :(a) binary ladder D/A converter.' (b) 4 bit binary shift register. (c) 3 bit binary magnitude comparator.

0000

,

GNDEC B.Tech ECE Sem 4 Dec 2007 Digital Electronics.pdf ...

Where do we use ASCII, Excess-3 & Grey codes? ... (ii) Express f in standard SOP form. . , ... GNDEC B.Tech ECE Sem 4 Dec 2007 Digital Electronics.pdf.

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