GTU Analog Electronics - May 2015 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 3)
Analog Electronics
May 2015

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

1 (a) Determine h-parameter for two port networks. Also draw the hybrid model for CE, CB and CC Configuration.

7 M

1 (b) Define Following electrical parameters: input offset voltage, input resistance, CMRR, SVRR, Large signal voltage gain, Output voltage swing, and slew rate.

7 M

2 (a) Draw two op-amp based differential amplifier and derive expressions for its gain, input and output resistances, and bandwidth.

7 M

Answer any one question from Q2 (b) & Q2 (c)

2 (b) The 741C op-amp having the following parameters is connected as a non-inverting amplifier with R₁=1kΩ and R_F=10 kΩ compute the values of A_F, R_iF, R_oF and V_ooT.

7 M

2 (c) Derive the expression for the closed loop gain, input resistance and output resistance of voltage series feedback amplifier.

7 M

Answer any two question from Q3 (a), (b) & Q3 (c), (d)

3 (a) What is an instrumentation amplifier? Explain with the help of neat diagram the operation of an instrumentation amplifier employing the three basic op-amps and with provision for variation in the voltage gain.

7 M

3 (b) Describe the working of an integrator circuit with relevant diagrams.

7 M

3 (c) Explain voltage to current converter with grounded load.

7 M

3 (d) Draw the circuit op-amp as differentiator and explain with necessary waveforms.

7 M

Answer any two question from Q4 (a), (b) & Q4 (c), (b)

4 (a) Draw and explain the use of op-amp as a zero crossing detector.

7 M

4 (b) Explain with circuit diagram the operation of a VCO.

7 M

4 (c) Explain the working of a summing and averaging amplifier when connected in inverting mode.

7 M

4 (d) Sketch the diagram of 555 timers as an astable multivibrator having 50% duty cycle. Explain its working and derive equation for frequency of output waveform.

7 M

Answer any two question from Q5(a), (b) & Q5 (c), (d)

5 (a) Explain with the help of circuit diagram, the operation of first order Butterworth low-pass filter.

7 M

5 (b) Explain op-amp as a comparator.

7 M

5 (c) What is PLL? Discuss different applications of PLL in detail.

7 M

5 (d) Draw and explain basic block schematic of 78xx series three terminal voltage regulator ICs.

7 M

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