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02000EC205092001

Cy aad co ‏وك‎
‎100 kQ

0

Derive the expression for voltage gain of a two-stage cascade amplifier.
PART छ

Answer any two full questions, each carries 15 marks.
What is Miller effect?
From the high frequency equivalent circuit, derive the expression for beta cut off
frequency of a bipolar transistor. Draw the frequency response for short circuit
current gain.
What are the conditions for sustained oscillation?
Find mid-frequency voltage gain and output impedance of a CE amplifier without
bypass capacitor using hybrid IT model.
Draw the circuit diagram of cascode amplifier.
Explain the working of an LC tank circuit.
Draw the circuit diagram of a Hartley oscillator. In Hartley Oscillator L;=0.3mH,
‏مآ‎ = 0,3mH and C=0.003 uF. Calculate the frequency of oscillation.
What are different feedback topologies? Explain how the current series feedback
effect the input and output impedances.
Differentiate between synchronous and stagger tuning.

PART C

Answer any two full questions, each carries20 marks.
A class-B push pull amplifier working with V.~-=25V provides a 22۷ peak signal
to a 8Q load. Calculate the amplifier efficiency and power dissipated per

transistor.

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