Answer All Questions
PART- A (10 x 2 = 10 Marks)
1.
Why
biasing is necessary in BJT Amplifier?
2.
Define
Stability factor.
3.
List
out the various biasing circuits for BJT.
4.
What
is loading effect? And how to minimize
it?
5.
Draw
the simplified small signal hybrid
equivalent circuit for npn transistor.
6.
What
is transconductance?
7.
What
is thermal run away?
8.
Draw
and explain the concept of DC Load line.
9.
What
is voltage swing limitation?
PART-B (5X13=65Marks)
11. a) Determine the bias resistor RB for fixed bias and collector to
base bias circuit and compare the stability factor ‘S’ for both of them. Given
Vcc=12V, RL=330Ω, IB=0.3mA,β=100,VCEQ=6v.
(OR)
b)
Explain in detail about Emitter Stabilized Bias circuit.
1. a) Explain in detail about
various bias compensation techniques in BJT.
(OR)
b) Explain the concept of fixed bias
circuit for BJT and derive its various stability factors.
2. a) Explain in detail about
voltage divider bias circuit for JFET with neat diagram and steps.
(OR)
b)
Explain in detail the small signal analysis of Common Emitter Amplifier with
bypassed RE and Unbypassed RE with neat sketch.
14. a) Derive the expression of Ri, Av and Ro for Common
Collector amplifier.
(OR)
b)
Derive the expression of Ri, Av and Ro for Common Base amplifier.
15. a) With neat sketch, explain
in detail about Cascode amplifier.
(OR)
b)i)
Design a collector to base bias circuit for the specified conditions: VCC=15V,
VCE=5V, IC=5mA and β=100
ii) Design a collector to base bias circuit
to have operating point of (10V,4mA). The circuit is supplied with 20V and uses
a silicon transistor of hfe=250.
PART-C
(1X15=15)
16. With neat circuit diagram,
explain in detail about the voltage divider bias circuit and derive the
expression for the stability factor of voltage divider bias circuit.
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