C C1121 Pages: 2

Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B. TECH DEGREE EXAMINATION(S), MAY 2019
Course Code: EE203
Course Name: ANALOG ELECTRONIC CIRCUITS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries5 marks. Marks

1 Design a clamper circuit using diode to obtain sine wave output with its (5)
negative peak clamped to +2.6V. (Assume diode drop as 0.6V).

2 Why does the gain of a transistor amplifier vary with frequency? Sketch the (5)
frequency response of CE amplifier.

3 Why negative feedback is utilised in amplifiers? How various parameters of 32 (5)
amplifier gets modified by negative feedback?

4 The gain bandwidth product of an op-amp is given as [|OMHz.Determine the (5)

bandwidth of a non inverting amplifier using op amp for a gain of 60dB.Also
find the closed loop gain of the amplifier if the required bandwidth is 100kHz.

5 Draw the circuit diagram of an ideal differentiator using op-amp with (5)
corresponding input and output waveform. Why the circuit can not be
recommended for practical use?

6 Design a comparator using Op Amp that compares a sinusoidal signal of 3۷ (5)
peak with a fixed ‏عل‎ voltage of 1.5V.Draw corresponding waveforms.
7 Design a Wein bridge oscillator with frequency of oscillation of 110117 using op- (5)
amp.
8 Draw ೩ monostable multivibrator circuit for a time period of Imsec with an (5)
amplitude of 10V using 555 timer.
PART ‏تا‎

Answer any twofull questions, each carries 10 marks.

9 ஐ Explain the construction and operation of Enhancement type MOSFET with (5)
neat diagrams.

b) Design a zener voltage regulator to provide regulated output voltage of 5.6 ۷ (5)
for a variable load resistance that varies from 30062 to 61002, Zener diode
parameters are Izmin= 0.25 mA and ‏حوط‎ 280mW .The input voltage is
considered as constant at ۷۰

10 a) The data sheet of N channel JFET gives the following details. [10855 1017114 and (5)
pinch off voltage of -4.8V.Determine (i) ४७६ corresponding to drain current of
3.5 mA. (ii)Determine transconductance gm at this drain current.

b) Draw the small signal AC equivalent circuit of a Common Drain FET (5)
amplifier. Derive the expression for voltage gain, input impedance and output
impedance.

11 a) Determine the following parameters for the fixed bias configuration of (4)
transistor amplifier. (i) Ig and Ic (ii)Vce and (111) Vg and Vc . Assume Vge=0.7V.

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