# GTU previous question papers -BE- Sem-III -Analog & Digital Electronics -March 2010

GTU previous question papers

GUJARAT TECHNOLOGICAL UNIVERSITY

B.E. Sem-III Remedial Examination March 2010

Subject code: 130902

Subject  Name: Analog & Digital Electronics

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Discuss universality of NOR gate. Also Derive all gates with the help of NOR gate 07

(b) Derive Full Adder with the help of necessary truth table, K – Map. Also express in

AOI logic diagram.

Q.2 (a) List and Discuss all ideal characteristics of an Op Amp 07

(b) Write Short Note on following

i. Summing Amplifier 02

ii. Integrator 02

iii. Merits and demerits of active filters 03

OR

(b) Draw functional block diagram of IC 555 & discuss function of each pin. 07

Q.3 (a) Draw & Discuss IC 555 as astable multivibrator 05

(b) Explain R – 2R ladder DAC with necessary diagrams. 05

(c) Discuss PLL with necessary diagrams. 04

OR

Q.3 (a) (i) (128.255)10 = ( ______ )2

(ii) (255.255)8 = ( ______ )2

(iii) (2345.99)10 = ( ______ )H

(iv) (1011)2 – (1101)2 = ________

(v) (7654)8 = ( _______ )H

(vi) Subtract using 1’s complement ( 5 )10 – ( 6 )10 = ( _____ )2

(vii) (1010)2 / (101)2 = __________

(b) For given function F = X Y + X Y, Find complement of F

Q.4 (a) Minimize the following Boolean expression using K-map and realize it using

AOI gates.

Y = Σm (0,2,7,8,9,10,12,13,14 )

(b) Realize & draw the following equation using only NOR gates.

Y = ( AB + C ) D

OR

Q.4 (a) Minimize the following Boolean expression using K-map and realize it using AOI gates.

Y = Π M (0,2,7,8,9,10,12,13,14 )

(b) Reduce & draw the following equation using only NAND gates.

Y = ( AB + B+C ) A B C

Q.5 (a) Define and discuss voltage parameters of Digital ICs and give expression for VNH & VNL

(b) Discuss multiplexers & demultiplexers with suitable diagram. 07

OR

Q.5 (a) Give classification of registers. Discuss 4 – bit buffer register using D – flip flop. 07

(b) Explain priority encoder with the help of truth table, K – Map & AOI Implementation.