unit v transistor biasing and thermal stabilization · 1. define transistor biasing and explain the...
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UNIT V
TRANSISTOR BIASING AND THERMAL STABILIZATION
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Module 1 Questions:
1. Define Transistor Biasing and explain the need for Biasing?
2. Explain the concept of DC and AC Load lines and discuss the criteria for fixing the Q-point.
3. Mention different types of Biasing a Transistor. And explain the Fixed Bias of a Transistor in
detail.
4. Define stability Factor of a Transistor and derive the expression for it.
5. Explain Collector to Base bias of a Transistor with neat circuit diagram.
6. Describe the factors to be considered while designing the biasing circuit which are responsible
for shifting the operating point.
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7. Derive the stability factors S, S’ and S
’’ of a Transistor Voltage Divider bias.
8. For the circuit shown in the Figure, calculate IB, IC, VCE, VB , VC and VBC. Assume that VBE = 0 and
β = 50.
9. Mention the advantages and disadvantages of various biasing techniques of BJT.
10. Design a collector to base bias circuit for the specified conditions: Vcc = 15V, VCE = 5V, IC = 5mA
and β = 100.
11. Discuss Diode Compensation Technique for the parameters VBE and ICO.
12. Describe Thermistor and Sensistor Compensation Techniques.
13. Derive the expression for Stability Factor S of a Fixed Bias Circuit.
14. Derive the expression for Stability Factor S of a Collector to Base Bias Circuit.
15. Define the three stability factors of BJT and explain the need of these stability factors in BJT.
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Module 2 Questions:
1. Discuss about Thermal Runaway and Thermal Resistance.
2. Derive the condition for Thermal Stability to avoid thermal runaway.
3. With neat diagram, explain Voltage Divider Bias Circuit for JFET.