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Linear Integrated Circuits Question Paper - Dec 18 - Electronics And Telecomm (Semester 4) - Mumbai University (MU)
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Linear Integrated Circuits - Dec 18
Electronics And Telecomm (Semester 4)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Q1 Attempt any 4 Questions:
a)
With neat circuit explain its working of comparator cicuit.
(5 marks)
00
b)
Write short note on: Bi FET and Bi MOS differential amplifier circuit.
(5 marks)
00
c)
Design a circuit with Op Amp, resistors and a capacitor that simulates an inductor of 1 H.
(5 marks)
00
d)
For a regulated dc power supply the output voltage varies from 12 V to 11.6 V when the load current is varied from 0 to 100 mA which is the maximum value of $I_L$. If the ac line voltage and temprature are constant, calculate the load regultion, %load regulation and output resistance of the power supply.
(5 marks)
00
e)
How can the true RMS value of voltage signal to measured using analog multipliers.
(5 marks)
00
Q2
a)
Design an adjustable output voltage regulator circuits using IC 317 to give 5 to 12 volts at $I_L$ = 1 Amp. Given: $I_{ADJ}$ = 100$\mu$A and let $R_1$ = 240$\Omega$.
(10 marks)
00
b)
Explain the operation of single slope integrating ADC and state its advantages, disadvantages.
(10 marks)
00
Q3
a)
Draw a neat circuit diagram of a RC phase shift oscillator using op-amp. Derive its frequency of oscillation. What are the values of R and C for frequency of oscillation to be 1 kHz?
(10 marks)
00
b)
Explain the working principle of successive approximation type ADC.
(10 marks)
00
Q4
a)
With the help of a neat diagram, input and ouput waveforms and voltage tranfer characterstics explain the working of non-inverting Schmitt trigger. Derive the expressions for its threshold levels. Explain how these levels can be varied?
(10 marks)
00
b)
Design a differentiator to differentiate an input signal that varies in frequency from 10 Hz to about 500 Hz. Draw its frequency response.if a sine wave of 2V peak at 500 Hz is applied to the differentiate, write expression for its output and draw output waveforms.
(5 marks)
00
Q5
a)
Draw the circuit diagram of a square and triangular waveform generator using op-amp. With the help of waveforms at suitable points in the circuit explain its working. Explain how duty cycle can be varied?
(10 marks)
00
b)
Analyze the circuit given in Fig. 5(b). Draw the waveforms an output terminal $v_o$ and across the capacitor C. Comment on the duty cycle of output waveforms. Take diode D as an ideal diode and assume $R_A$ is equal to $R_S$.
(10 marks)
00
Q6 Short notes on: (Attempts any four)
a)
Wilson current source
(5 marks)
00
b)
Temprature compenstaed log amplifier
(5 marks)
00
c)
Wein bridge oscillator
(5 marks)
00
d)
XR2206 waveform generator.
(5 marks)
00
e)
Switch mode power supply
(5 marks)
00
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