Analog Circuits (EC-405) - Important Questions

Explain the four feedback topologies: voltage-series, current-series, voltage-shunt, and current-shunt with diagrams.

Explain the working principle of a Wien bridge oscillator with neat circuit diagram, including its advantages and limitations.

Draw / sketch the RC phase-shift oscillator circuit, explain its working / operation and derive / determine the expression for frequency of oscillation.

Explain the concept of feedback and its types, including amplifier with negative feedback and its advantages with examples.

Explain the concept of positive (and negative) feedback with waveforms and discuss the Barkhausen criterion for oscillation.

Explain the advantages and disadvantages of introducing negative feedback in amplifiers.

State and explain the Barkhausen criterion for sustained oscillations and its importance.

Explain how negative feedback is implemented in amplifier circuits and discuss its advantages.

Calculate the frequency of oscillation of an RC phase-shift oscillator for given R and C values.

Explain with mathematical expressions how negative feedback in amplifiers increases bandwidth and reduces distortion.

Draw and explain the operation of Colpitt's oscillator.

Describe LC type oscillators with generalized analysis.

What is an integrated circuit (IC)? Explain its characteristics and relative advantages and disadvantages over discrete assembly.

Define/explain op-amp DC and performance parameters: input offset voltage, input bias current, input offset current, output offset voltage, CMRR, PSRR, thermal drift, and their effect on accuracy

What is understood by IC data sheets? Explain their importance and what type of information can be collected from them.

Define and explain op-amp DC and AC characteristics including CMRR, slew rate, input bias current, input/output offset voltage, and PSRR.

Describe the structure and operation of a single-input balanced-output differential amplifier.

Calculate the output voltage of a differential amplifier for given resistor values and input voltage difference.

Calculate output/input offset voltage due to input bias current with a given feedback resistor

List and explain the ideal characteristics of an operational amplifier.

Discuss the differential amplifier, its advantages and applications.

Draw the equivalent circuit of an ideal op-amp and the pin diagram of IC-741, explaining the function of each pin.

Explain in detail the basic building components of ICs.

Discuss the basic building components of ICs and IC data sheets.

With neat sketch explain the operation of op-amp as integrator and differentiator.

Describe the voltage-series feedback amplifier configuration and its characteristics.

Write a short note on any two

With a neat diagram explain the operation of instrumentation amplifier using Op-Amp and derive the necessary expression.

Explain in brief Zero Crossing Detector.

Find the output voltage ($V_{out}$) for the given op-amp combinations.

Discuss the operation of op-amp as integrator.

Discuss the application of OP-AMP as voltage-shunt feedback amplifier.

Explain / design first-order Butterworth low-pass filter using op-amp, including circuit diagram, gain and frequency response.

Explain the magnitude and frequency response of a filter. How do these characteristics vary with the type of filter?

Explain second-order Butterworth low-pass filter.

Explain the operation, comparison, and advantages/limitations of fixed versus adjustable voltage regulators

Explain the operation of Schmitt trigger circuit (using 555 timer) with diagram.

Draw the astable multivibrator circuit diagram using IC-555 timer and explain its working.

Explain characteristics of standard regulator ICs / linear regulator in detail

Describe the block diagram and pin configuration of the 555 timer IC. Explain the function of each pin.

Discuss the operation of a peak detector circuit and how it captures and holds the peak value of an input signal.

Describe the features and specifications of the LM317 voltage regulator IC. What are its typical applications?

Explain fixed and adjustable voltage regulator, switching regulator (and linear regulator)

Describe/explain the working of monostable multivibrator using IC-555 timer.

Write short notes on Clipper and clamper circuits, Zero Crossing Detector, CMRR, Wien Bridge Oscillator.

What is a sample and hold circuit? Draw and explain its working with a suitable sketch.

Differentiate monostable, bistable and astable multivibrators.

Calculate the voltage gain of the following circuit: