Analog & Digital Circuits - Dec 2014

Information Technology (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Solve any five

1 (a) Convert (41.62)₈ to decimal, binary and hexadecimal(4 marks) 1 (b) Compare BJT and FET.(4 marks) 1 (c) Why Zener diode is used as regulator?(4 marks) 1 (d) Define (i) Slew rate (ii) CMRR. What are the typical values of slew rate and CMRR for Op-amp IC-741?(4 marks) 1 (e) Convert JK-flip flop to D flip flop.(4 marks) 1 (f) What do you mean by Universal gate? Implement Ex-Or gate using NAND gate.(4 marks) 2 (a) What is the need of biasing? Explain Voltage divider bias and locate Q point.(10 marks) 2 (b) Design half adder using VHDL.(5 marks) 2 (c) Simplify $$ \begin{align*} AB+B+&\overline{AC}+ A\overline{B}C ( AB+C) \\ &AB+B+\overline{AC}+ A \overline B C (AB+C) \end{align*} $$(5 marks) 3 (a) Minimize the following Boolean function using K-map.
F(A,B,C,D)=?m(0,3,7,11,15)+d(1,2,5)(10 marks) 3 (b) Explain Differentiator using Op-amp(5 marks) 3 (c) Explain the working of Liquid Crystal display.(5 marks) 4 (a) Design and implement 4 bit binary to gray code converter.(10 marks) 4 (b) Implement F(A,B,C,D)=?m(1,2,5,11,14)+d(0,3) using 8:1 multiplexer.(5 marks) 4 (c) Explain inverting amplifier using Op-amp expression for output voltage.(5 marks) 5 (a) Explain the working of astable multi-vibrator using IC-555. Design astable.(10 marks) 5 (b) Differentiate between combinational and sequential logic circuits.(5 marks) 5 (c) Design mod-3 up counter using JK flip-flop.(5 marks)

Write notes on Any Four:-

6 (a) Instrumentation amplifier using 3-Op-Amp.(5 marks) 6 (b) Shift registers.(5 marks) 6 (c) Race around condition(5 marks) 6 (d) Current mirror circuit(5 marks) 6 (e) Multiplexers and De multiplexers.(5 marks)