Analog & Digital Circuits - May 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. 1 (a) Explain block diagram of op-amp(5 marks) 1 (b) Explain zero crossing detector(5 marks) 1 (c) Explain significance of CMRR for a differential amplifier(5 marks) 1 (d) Explain the basic principle of D to A converter(5 marks) 2 (a) Explain internal block diagram of astable multivibrator using IC 555 and explain the one application of it.(10 marks) 2 (b) For the differential amplifier find Ad, Ac, CMRR, Rin and Ro
(10 marks) 3 (a) Draw the transfer characteristics of an n-channel JFET with the help of Schockley's expression and explain its significance. (10 marks) 3 (b) Desing a wide bandpass filter for FL=1KHz and passband gain equal to 4. Also find quality factor.(10 marks) 4 (a) Draw the block diagram of an oscillator and expalin the Barkhausen conditions to obtain sustained oscilations.(10 marks) 4 (b) Design a stable multivibrator using 555 for duty cycle 75% and output frequency 5 kHz(10 marks) 5 (a) Explain the basic requirement for the instrumentation amplifier. Find the expression for output voltage using three op-amp.(10 marks) 5 (b) Explain the non-inverting schmitt trigger and give the schmitt trigger advantages over the conventional comparators.(10 marks) 6 (a) Design a voltage regulator using I2 723, Vo=5V, Io=50 mA, Isc=75 mA, vin=15V.(10 marks) 6 (b) Design a R-C phase shift oscillator for output frequency 1 KHz.(10 marks) 7 (a) Explain the averaging amplifier. (5 marks) 7 (b) Explain three terminal voltage regularor(5 marks) 7 (c) Explain dual slope ADC and state its advantages(5 marks) 7 (d) Explain 555 as a voltage controlled oscillator.(5 marks)