STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Define the following characteristics of practical op-amp:
(i) Input offset voltage
(ii) CMMR
(iii) PSSR
(iv) Slew rate.
(i) Input offset voltage
(ii) CMMR
(iii) PSSR
(iv) Slew rate.
6 M
1 (b)
What is slew rate ? What are its causes ? Derive its expression for maximum frequency of operation for a desire output swing in terms of slew rate.
6 M
2 (a)
Justify, how constant current source is used in place of RE to improve the CMRR for a differential amplifier.
6 M
2 (b)
What is need for frequency compensation? State and explain Pole?Zero compensation method of frequency compensation.
6 M
Answer any one question from Q3 and Q4
3 (a)
Why basic Integrator is needed to be modified ? Draw the circuit diagram of Practical Integrator along with frequency response and explain its operation.
6 M
3 (b)
List important characteristics of Comparator? What are the advantages of Schmitt trigger over Comparator ?
6 M
4 (a)
Draw circuit diagram of Three op-amp Instrumentation Amplifier and write its output equation.
6 M
4 (b)
Design a Schmitt trigger for UTP=3V and LTP and LTP=-2V with general purpose op-amp 741. Assume VCC= +/-12V. Draw detailed diagram with designed values.
6 M
Answer any one question from Q5 and Q6
5 (a)
Draw a neat schematic of Voltage Controlled Oscillator (VCO) using Op-amp. Derive the expression for output frequency.
6 M
5 (b)
With the help of a neat block diagram, explain operation of Phase Locked Loop (PLL). Define the term 'Lock Range' and 'Capture Range'
6 M
6 (a)
Explain Voltage to Current Converter with grounded load using Op-amp and give its applications.
6 M
6 (b)
Define 'Lock Range', 'Capture Range' and 'Pull-in time' and explain the transfer characteristics of Phase Locked Loop (PLL).
7 M
Answer any one question from Q7 and Q8
7 (a)
Draw the circuit diagram of voltage mode R-2R ladder Digital to Analog converter (DAC) and explain its working.
7 M
7 (b)
Calculate output frequency 'f0' Lock range 'ΔfL', Capture range 'Δfc', of a PLL if RT=1 kΩ, CT=0.1 μF and filter capacitor C=10 μf. Assume V=20 V.
6 M
8 (a)
Explain successive approximation type ADC with neat block diagram. An 8-bit ADC output all 1's when Vi =5.1 V. Find its:
i) Resolution
ii) Digital output, when Vi=1.28 V.
i) Resolution
ii) Digital output, when Vi=1.28 V.
8 M
8 (b)
Explain various power supply performance parameters.
5 M
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