STUPIDSID
1(a)
With a neat circuit diagram, explain the operation of a capacitor coupled voltage follower.
6 M
1(b)
Design a high Zin capacitor -coupled non investing amplifier to have a low cutoff frequency of 200Hz. The input and output voltages are to be 15mV and 3V respectively and the minimum load resistance id 12 Ω [ using BIFET operational Amplifier].
8 M
1(c)
With neat sketch, briefly explain the circuit of a capactior coupled inverting amplifier.
6 M
2(a)
Define: i) Loop gain ii) Loop phase shift iii) Unity gain band width.
6 M
2(b)
Sketch circuit for lag compensation, lead compensation and miller effect compensation. Explain the operation of each circuit, and each affects the op-amp frequency response.
10 M
2(c)
Briefly explain stray capacitance effect, load capacitance effect.
4 M
3(a)
With a neat circuit diagram, show how a half wave precision rectifier can be combined with a summing circuit to produce a full wave precision rectifier. Draw the voltage wave form for a relebvant stage. Write a equation to show that full wave rectifier is performed.
8 M
3(b)
Draw the diagram for an op-amp sample -and - hold circuit. Sketch the signal, control and output voltage waveforms carefully explain the circuit operation.
6 M
3(c)
A ± 10KHz square wave from a signal generator with source resistance of 100Ω is to have its positive peak clamped at ground level. The tilt on the output is not to exceed 1% of peak amplitude of the wave. Design a suitable op-amp circuit using ± 12V supply.
6 M
4(a)
Sketch the circuit diagram of an op-amp monostable multi-vibrator, draw the circuit wave forms and explain its operation.
8 M
4(b)
Analyze the Schmitt trigger circuit in figure to determine the UTP and LTP. Assume that the op-amp is rail to rail operated and that the diode forward voltage drop is 0.7V.
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6 M
4(c)
Design a zero crossing detector using 741 op-amp with ± 15V supply. Determine the typical output voltage swing and the typical input voltage level above and below the ground level at which the output switches, Also calculate the rise time of the output voltage.
6 M
5(a)
Draw the circuit diagram of triangular/rectangular wave from generator using op-amps. Sketch the circuit waveform, and explain its circuit operation.
8 M
5(b)
Design a Wein bridge oscillator to have frequency of 1KHz. Use a 741 op-amp with V0±9V.
6 M
5(c)
Show how the output amplitude of a phase shift oscillator can be stabilized by means of inverse parallel connected diodes. Explain how the circuit limits the output amplitude.
6 M
6(a)
Derive expression for gain and angleof first order low pass butter worth filter. Draw the frequency response curve. Explain its operation.
8 M
6(b)
Design a single stage wide band pass filter have unity voltage gain and a pass band from 300Hz to 30KHz.
6 M
6(c)
Show how the circuit of a single stage wide band pass filter can be modified for narrow band operation. Briefly explain.
6 M
7(a)
Draw the basic block diagram and waveforms for a PLL system, Indentify each component part ad explain its function.
8 M
7(b)
Explain the theory of operation of the switched capacitor filter.
8 M
7(c)
Distinguish between small signal amplifier and power amplifier.
4 M
8(a)
Define: i) Line regulation
ii) Ripple rejection
ii) Ripple rejection
4 M
8(b)
With a neat circuit, explain working of precision voltage regulator.
8 M
8(c)
Design a voltage follower type regulator circuit using 741 op-amp with following specification. i) Output voltage 12V
ii) Maximum load current-50mA.
ii) Maximum load current-50mA.
8 M
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