28.2.10 - Conclusion on Stability
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Practice Questions
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What is the primary disadvantage of fixed bias in transistors?
💡 Hint: Consider how changes in transistor characteristics can affect current.
Describe what is meant by the term saturation in a common emitter amplifier.
💡 Hint: Think about how the output voltage behaves under high current conditions.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What happens to the operating point in a fixed bias circuit when beta increases?
💡 Hint: Think about the consequences of increased current demand.
True or False: Cell bias is more reliable than fixed bias under varying temperature conditions.
💡 Hint: Consider which bias method adjusts dynamically to changes.
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Challenge Problems
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If you have a common emitter fixed bias amplifier with a supply voltage of 12V and a beta of 150, calculate the maximum collector current if the transistor saturates. Explain your reasoning.
💡 Hint: Consider the drop across your load when current saturates.
Design a cell-biased amplifier aimed to maintain 4mA collector current despite changes in beta between 100 and 300. Discuss the selection of resistances needed.
💡 Hint: Use the feedback principle to ensure stable operation across beta changes.
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