Analog & Digital Circuits - Dec 2015

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:
i) (174.03125)₁₀ in octal number and (DB, 94)₁₆ in binary
ii) Make subtraction using 2's complement method (52)₁₀ - (65)₁₀(4 marks) 1 (b) Compare Schottky barrier diode and PN junction diode.(4 marks) 1 (c) Derive the relation between α and β.(4 marks) 1 (d) List the ideal characteristics of OPAMP.(4 marks) 1 (e) Prove that NAND gate is universal gate.(4 marks) 1 (f) Convert T-FF to D-FF.(4 marks) 2 (a) Draw block diagram of a shunt voltage regulator and explain the working.(4 marks) 2 (b) Derive the expression for the stability factor 'S' of a voltage divider bias circuit.(8 marks) 2 (c) Draw circuit diagram of differentiate using OPAMP and explain.(8 marks) 3 (a) Explain inverting summing amplifier using OPAMP. Derive the expression for output voltage.(8 marks) 3 (b) $ \text{Y = ABC}+\text{B}\overline{\text C}\text D + \overline {\text A}\text{BC} $ simplify this equation and realize using basic gates.(4 marks) 3 (c) Minimize the following expression using K-map Y=∑m(1, 2, 9, 10, 11, 14, 15). Implement the circuit using minimum number of gates.(8 marks) 4 (a) Design on 8 bit comparator using IC 7485.(8 marks) 4 (b) Implement the following function using 8:1 Mux
F(A, B, C, D) = ∑m(0, 1, 2, 4, 6, 9, 12, 14).(4 marks) 4 (c) What is shift register? Mention different modes of operation of shift register.(8 marks) 5 (a) What are advantages of VHDL. Write VHDL program for full adder.(8 marks) 5 (b) Design 4 bit synchronous up counter using T-FF.(8 marks) 5 (c) Draw the circuit of JK FF using NAND gates and write the truth table.(4 marks) 6 (a) Design on astable multivibrator using IC 555 timer to generate an output of 1KHz with 60% duty cycle.(5 marks) 6 (b) Draw the circuit diagram of regulated power supply to produce out put voltage of +5V.(5 marks) 6 (c) Draw drain characteristics of n-channel JFET and explain various regions.(5 marks) 6 (d) What is excess 3 code? Why it is called self complementary code?(5 marks)