SPPU Integrated Circuits - May 2014 Exam Question Paper

SPPU Electronics and Telecom Engineering (Semester 4)
Integrated Circuits
May 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2

1 (a) State any four characteristics of an ideal OPAMP?

2 M

1 (b) A dual input, balanced-output (DIBO) differential amplifier has following specifications: R_CI=R_C2=2.2 KΩ, R_E=4.7 KΩ, R_in=R_in2=50 Ω, +V_CC=10V, -V_EE=-10 V, β_dc=βac=100 and V_BE=0.715V. Calculate
i) I_CQ
ii) V_CEQ
iii) Voltage gain A_d.

4 M

1 (c) Why frequency compensation is required in OPAMP? Explain dominant pole compensation with circuit? & frequency response.

6 M

2 (a) Give the classification of ICs according to number of components per chip?

2 M

2 (b) An inverting amplifier using IC741 OPAMP has flat frequency response up to 40 Khz, voltage gain of 10. Find maximum peak ? to peak input voltage to get maximum distortion less output?

4 M

2 (c) Why level shifter/ translator is needed in an OPAMP? What are its different types? Explain level shifter with constant current bias using diodes.

6 M

Answer any one question from Q3 and Q4

3 (a) Draw an inverting summing amplifier with three inputs? Derive an expression for its output voltage V_O= -(Va+Vb+Vc).

6 M

3 (b) Draw half wave precision rectifier & explain its operation in brief?

3 M

3 (c) Draw an inverting comparator? Using OPAMP with -Ve reference & explain its operation in brief with waveforms?

3 M

4 (a) For an inverting Schmitt trigger R1=100Ω R₂=56KΩ (where R2 is connected in feedback path). If Vin=1 V_(P=P) sine wave and Vs=±15V, calculate: i) V_UT & V_LT

2 M

4 (b) Draw & explain in brief an instrumentation amplifier interfaced with RTD bridge for temperature measurement.

6 M

4 (c) Draw & explain in brief a sample & hold circuit with waveforms?

4 M

Answer any one question from Q5 and Q6

5 (a) In a V-I converter with grounded load, Vin=5V, R=10KΩ and voltage at non-inverting terminal is 1V. Assuming that OPAMP is initially nulled, Calculate:
i) Load current
ii) The output voltage Vo.

4 M

5 (b) Draw a 2-bit D/A converter with R-2R resistor & explain its operation? State its advantages?

5 M

5 (c) Explain various specifications of A/D converter.

4 M

6 (a) Draw an I-V converter and derive an expression for its output voltage (Vo)?

4 M

6 (b) Draw & explain 2-bit flash type analog to digital converter (ADC).

5 M

6 (c) An 8-bit D/A converter has a resolution of 10 mV/bit. Find the analog output voltage for the following digital inputs:
i) 10001010
ii) 00010000

4 M

Answer any one question from Q7 and Q8

7 (a) Draw the block schematic of PLL and explain each block in detail.

7 M

7 (b) Design an adjustable voltage regulator using LM317 for following specifications:
Output voltage, Vo=5V to 12V
Output current, Io=1A and R1=240Ω (R1 is connected between O/p terminal & adj terminal).

4 M

7 (c) Explain the following terms:
i) Load regulation
ii) Line regulation

2 M

8 (a) For a PLL 565, the free running frequency is 2.5 Khz, _V_CC=+10V, -V_EE=-10V. If demodulation capacitor (C2) is 10μF, find lock range & capture range.

4 M

8 (b) State application of PLL? Also draw block diagrams of FSK demodulator.

5 M

8 (c) Draw & explain a three terminal voltage regulator with current boosting.

4 M

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