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C192055 Pages:3

Design a circuit using passive components to convert a | KHz triangular wave to
a square wave
With the help of a block diagram, explain the working of an SMPS
PART C

Answer all questions, each carries 3 marks.
The output of a transistor based RC coupled amplifier appears clipped during
both half cycles. Identify possible issues and suggest solutions.
What are the different feedback arrangements used in amplifiers and oscillators
Sketch and explain a common source MOSFET amplifier
Explain the working of a crystal oscillator

PART D
Answer any two full questions, each carries 9 marks.
Design an RC Coupled Amplifier using transistors with the following

specifications :

८८ = 10 V de, [८ = 2 mA, hg = 100, Lower cut off frequency = 100 Hz, Upper
cut off frequency = 100 KHz.

Justify the shape of the frequency response curve.

Sketch and explain a Wein Bridge Oscillator using transistors. Examine how
Barkhausen criteria is satisfied in this circuit

With neat sketches and relevant waveforms, explain the working of an Astable

Multivibrator using transistors. For the circuitif #} = + and 4 = + where 81,

m n
R2, Cl and C2 denote timing components as usual, prove that the duty cycle of the

is ‏لل‎
‎output waveform is 75

PART E

Answer any four full questions, each carries 10 marks.
Compare ideal and actual parameters of an OPAMP
Draw and explain the circuit of a summing amplifier using OPAMPs. Realise
Y(t) =5 + 3 sin छा — 6 cos ot using IC 741
Sketch and explain an OPAMP integrator. Realise an active integrator using
10741 for a frequency of 2 KHz
Compare active and passive filters
Draw and explain a sample and hold circuit. Cite a few of its applications

Quote a few practical applications of OPAMPS

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