Subject Title: Linear Integrated Circuits & Basics of Communication Prepared by: E Gayathri
Year: II Semester: IV Updated on: 25/03/
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Unit - I: Operational Amplifiers
- Define operational amplifier.
- Define the terms CMRR, Slew rate Virtual ground, Offset errors.
- What are the ideal characteristics of op-amp?
- Explain the need for differential amplifier.
- Discuss about Op-amp as differentiator, Integrator circuits.
- Draw the block diagram of operational amplifier and explain in detail.
- Explain the working of emitter coupled differential amplifier.
- Discuss the working of operational amplifier as a summing amplifier and obtain its output voltage.
- Draw the circuit diagram of inverting and non -inverting amplifiers and explain their operation. Derive expressions for voltage gain.
- Explain the comparator action of an op-amp.
- Describe how op-amp is used as a Voltage follower.
- Discuss the working of op-amp as Subtractor.
- Problems based on all topics.
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Applications of operational amplifiers
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Unit - II:
- Draw the block diagram of IC-555 timer and describe its working.
- Draw the circuit of Astable Multivibrator with IC -555 and explain.
- List out the features of 555 timer.
- Draw the circuit of Wein bridge oscillator with op-amp and obtain its frequency.
- Explain how op-amp can be as a logarithmic amplifier with a diode.
- With the help of a neat diagram explain how op-amp is used to generate a sine wave?
- Draw the circuit diagram of a square Wave generator using op-amp and explain its operation.
- Draw the circuit of Triangular wave generator using op-amp and explain
- Explain the working of Monostable multivibrator using op-amp.
- Explain with a neat diagram, how op-amp can be used to solve differential equations of second order.
- Explain with relevant diagrams, how IC-555 timer is used as astable multivibrator.
- Explain with the help of a circuit diagram how IC-555 timer is used as a monostable multivibrator.
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Unit - III: Modulation
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- What is Modulation?
- What is the need for modulation?
- Give advantages of AM.
- Define modulation index of AM signal.
- Derive the expressions for frequency spectrum of A.M wave.
- What is AM? Show that an AM wave contains a carrier and two side bands for every modulating frequency.
- Give the theory and working of diode detector to detect the AM signals.
- Define Demodulation.
- Explain the working of a simple amplitude modulator with relevant circuits.
- Derive the expressions for total transmitted power of AM wave.
- Explain the working of Balanced modulator circuit.
- Explain the principle of AM detection and classify A.M. detectors.
- Draw the circuit of envelop diode detector and explain graphically the conditions.
- Draw the circuit diagram of square law diode modulator and explain its performance.
- Problems based on all topics.
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Unit - IV: Frequency modulation
- Define frequency modulation.
- Write the expressions for band width of FM Signal
- Give the advantages and disadvantages of FM.
- Draw the block diagram of FM radio receiver. Explain the Significance of each block.
- Write about Delta modulation.
- Write about PAM, PCM?
- Give the Analysis of Frequency modulation.
- Compare AM and FM.
- Draw the circuit of simple frequency modulator and explain its working.
- Draw the block diagram of Super hetero dyne receiver and explain its working.
- Explain the principle and working of ratio detector.
- Derive the expression for spectrum of F.M. Wave.
- Explain how FM waves are detected?
- Give an account of classification of pulse modulation techniques.
- Draw the block diagram of FM discriminator with circuit diagram.
- Problems based on all topics.
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