Rr310405-linear Ic Applications

RR

Code No: RR310405 III B.Tech I Semester(RR) Supplementary Examinations, May 2009 LINEAR IC APPLICATIONS (Electronics & Communication Engineering)

Time: 3 hours

Max Marks: 80 Answer any FIVE questions All questions carry equal marks ?????

1. (a) List out ideal characteristics of op-amp. Draw equivalent circuit of op-amp. (b) Explain external frequency compensation techniques. 2. (a) What is hysteresis?. Obtain expression for hysteresis voltage of Schmitt trigger. (b) Explain features of 723 voltage regulator. 3. (a) Derive generalized expression for voltage gain of second order filter and from it, obtain transfer function of high pass filter. (b) Design RC phase shift oscillator to oscillate of 100 HZ. Assume C=0.1µF. 4. (a) Explain operation of 555 time, in a stable mode and derive expression for o/p frequency. (b) Explain how PLL can be used for AM and FSK demodulation. 5. (a) Explain operation of R-2R ladder type DAC. What is draw back of it? How it can be rectified using inverted R-2R ladder type DAC. (b) List out specifications of converters. 6. (a) With neat sketches, explain operation of square wave generator and obtain expression for O/P frequency. (b) Explain classification of oscillators. 7. (a) Explain operation of successive approximation ADC with an example. (b) What is advantage of using op-amp in a rectifier? 8. Write short notes on the following. (a) Sample and hold circuit. (b) Types of filters. (c) Fixed voltage regulators. ?????