## Analog & Digital Circuits - Dec 2013

### 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 four:-

**1 (a)** Find out relations between ?, ? and ? as current amplification factors for CE, CB, CC configurations.(5 marks)
**1 (b)** State ideal and practical characteristics of Op-Amp.(5 marks)
**1 (c) ** Convert following decimal number to Binary, Octal, Herl-equivalent and gray code.

(i) (306.8)_{10} (ii) (147.8)_{10}(5 marks)
**1 (d)** Add (57)_{10} and (26)_{10} in BCD(5 marks)
**1 (e) ** Convert S-R flip-flop to D-flip-flop(5 marks)
**1 (f)** Explain parallel input, serial output shift register. (5 marks)
**2 (a)** Determine the following for the fixed bias.

(i) I_{BO} and I_{CQ}

(ii) V_{CEQ}

(iii) V_{B} and V_{C}

(iv) V_{BC}

**2 (b)**For the differential amplifier as shown below calculate: -

(i) Operating points

(ii) Voltage gain

(iii) Input Impedance

(iv) Output impedance

(8 marks)

**2 (c)**Design a circuit to V

_{0}=15 (V

_{1}-V

_{2}) where V

_{1}and V

_{2}are input voltage to Op-Amp.(4 marks)

**3 (a)**What are different methods used to improve CMRR in differential amplifier?(8 marks)

**3 (b)**Design a differentiator to differentiate an input signal that varies in frequency from 10 Hz to about 5 KHz.(8 marks)

**3 (c)**Explain Instrumentation amplifier using 3 Op-Amps.(4 marks)

**4 (a)**Design an astable multivibrator for an output frequency of 1KHz and duty cycle 40%.(6 marks)

**4 (b)**Minimize the following expression using K-map and realize using the gates.

Y=?m(1,2,9,10,11,15,15)(6 marks)

**4 (c)**Design 2-bit magnitude comparator using basic gates.(8 marks)

**5 (a)**Implement the following function using 8: 1 MUX

f(A, B, C, D)=?m(2,4,5,7,10,15)(6 marks)

**5 (b)**Implement full adder using demultiplexer.(6 marks)

**5 (c)**Design the divide by 7 (mod-7) asynchronous up-counter using J-K flip flop. Also state difference between synchronous and asynchronous counter.(8 marks)

**6 (a)**Explain universal shift register and its applications.(6 marks)

**6 (b)**Explain VHDL(4 marks)

**6 (c)**What is Zener shunt regulator? Explain and derive stability factor.(4 marks)

**6 (d)**Realize following using only NAND gates.

Y=(AB+BC)C.(6 marks)