Integrated Circuits - May 2015

Electronics & Telecomm. (Semester 5)

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 the following:

1 (a) Design a circuit to keep LED 'ON' for 30 seconds once circuit is triggered. (4 marks)

1 (b) What is CMRR for op-amp and how to measure it practically? (4 marks)

1 (c) Explain first order active filter circuit. (4 marks)

1 (d) Design a 0.5A current source using IC7805. Assume RL=100. (10 marks)

1 (e) Explain 7490 Decade counter. (10 marks)

2 (a) Design triangular waveform generator for frequency for 85KHz and Vopp=6V using op-amp. (10 marks)

2 (b) Explain IC 741 based RC phase shift oscillator with proper waveforms. Design RC Phase shift oscillator to produce sinusoidal frequency output of 5 Khz. (10 marks)

3 (a) Design a high pass second order filter for the cut off frequency of 1 Khz and passband gain AF=2. (10 marks)

3 (b) Write the advantages of precision rectifier. Explain half wave precision rectifier along with neat waveforms. (10 marks)

4 (a) Design a voltage regulator using IC 723 to give V0=5V and output current of 2A. (10 marks)

4 (b) Draw instrumentation amplifier using opamp and hence derive equation for output voltage. (6 marks)

4 (c) Explain zero crossing detector with neat diagram. (4 marks)

5 (a) Draw and explain the functional diagram of IC 555 and explain its operation in astable mode. (10 marks)

5 (b) With the help of neat circuit diagram explain the working of 74163 synchronous 4-bit binary counter. Also illustrate the cascading connections for 74163 based counters. (10 marks)

Write short notes on the following:

6 (a) 74181 Arithmetic Logic Unit. (5 marks)

6 (b) Current foldback protection. (5 marks)

6 (c) Any two applications of PLL 565. (5 marks)

6 (d) Voltage to frequency converter. (5 marks)