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Posted By: Sra1 Member Level: Diamond Posted Date: 27 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Applied Electronics and Instrumentation LINEAR IC APPLICATIONS (Supplimentary Examinations, Aug/Sep 2007) Question paper
Set No 3
--------------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Derive the expression for CMRR for the first stage differential amplifier.
(b) Explain briefly the properties of all differential amplifier configurations. [8+8]
2. (a) What is an op-amp? Why it is called so?
(b) Explain the parameters that should be considered for ac and dc applications of an op-amp.
(c) Draw and explain the three open loop op - amp configurations with neat circuit diagram. [4+7+5]
3. (a) For the non - inverting a.c. amplifier Rin = 50
, ci = 0.1µf, R1 = 1K
,R0
= R3 = 820
, RF = 5.6K
and Rl = 10K
. Determine the gain and band
width of the amplifier.
(b) What is an instrumentation amplifier? List any three applications of the instrumentation amplifier. [8+8]
4. (a) Describe the principle of operation of precision half wave rectifier with waveforms.
(b) Explain the operation of antilog amplifier using op - amp. [8+8]
5. (a) An ideal LPF having fh = 5kHz is cascaded with HPF having fl = 4.8kHz. Sketch the frequency response of the cascaded filter.
(b) Design a Ist order LPF for a high cut off frequency of 2kHz and pass band gain of 2. [10+6]
6. (a) Configure a 555 timer as a Schmitt trigger and explain.
(b) Explain frequency translation and FSK demodulation using 565 PLL. [8+8]
7. (a) Sketch and explain the transfer characteristic of a DAC with necessary equations.
(b) LSB of a 9 - bit DAC is represented by 19.6mv. If an input of 9 zero bits is represented by 0 volts.
i. Find the output of the DAC for an input 10110 1101 and 01101 1011.
ii. What is the Full scale reading (FSR) of this DAC? [8+8]
8. What are all basic blocks of analog multiplexer? Explain how the data selections process is performed it. [16]
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