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C1121 Pages: 2

Given B=100,Vec=16V,Rce=2.2kQ and 78-240 kQ.

Design a voltage divider bias circuit to obtain the following specifications and
determine the stability factor. Assume the ratio of base current to the current
through 1४2 is 1:10. Given 3೧೧2271, B=100, Vcr=50% of Vcc, VRE =10% of
Vcc, Ic=0.8mA and Vpe=0.7V.

PART C
Answer any two full questions, each carries10 marks.

Specify different schemes of coupling in multistage amplifiers. Compare their
merits and demerits

Why class AB power amplifiers are preferred over Class B operations?

Derive the expression for frequency of oscillation for RC phase shift oscillator
using BJT.

The datasheet of Op Amp gives the following values.

Open loop Gain= 175,000, common-mode gain =0.18 and slew rate= 0.5V/us.
Determine the CMRR in decibels. How long does it take the output voltage of
an op-amp to go from -10V to +10V?

Derive the expression for output power and conversion efficiency of class B
push pull power amplifier.

How do the open-loop voltage gain and closed-loop voltage gain of an op-amp
differ? What is the limiting value of output voltage of Op Amp Circuit? Justify
with proper characteristics.
PART D
Answer any twofull questions, each carries 10 marks.
Design an Op Amp circuit to get the output according to the given expression.
Vo =-[0.3V1+3V2+V3] where ۷۱,۷۰ and V3 are the inputs 10 op-amp.

Analyze the circuit diagram of an Instrumentation amplifier using op-amp.
Derive the expression for output voltage.
Draw and explain the operation of a triangular wave generator using op-amp.

Design an astable multi vibrator using 555 timer for an output wave of 60%
duty ratio at 2kHz frequency.

Draw the circuit diagram of a Precision rectifier using op-amp. What is the
main advantage over a normal rectifier?

Design an RC phase shift oscillator using op-amp for an output frequency of
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