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26.3.2. Sensitivity to β Variation

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  1. 1.

    What does β represent in a transistor?

    Hint

    Think about the definition relating to current.

  2. 2.

    What is the primary advantage of self-biasing over fixed bias?

    Hint

    Consider the impact of varying parameters.

  3. 3.

    What role does the emitter resistor play in a self-biased amplifier?

    • Offers stability against β variation
    • Increases the gain
    • Decreases the input impedance
    Hint

    Consider the main reason for its inclusion.

  4. 4.

    True or False: In a fixed bias configuration, the collector current is less sensitive to β changes than in self-bias.

    • True
    • False
    Hint

    Think about how changes in β affect the circuit.

  5. 5.

    Given a fixed bias amplifier with β = 100 and I_B = 0.1 mA, calculate I_C. Then, evaluate how a decrease in β to 80 affects I_C.

    Hint

    Use the formula carefully and re-evaluate with the new β value.

  6. 6.

    Design a self-biased amplifier circuit and illustrate how the stability is maintained against β variations with a numerical example.

    Hint

    Consider setting R_E to be significantly smaller than the effective resistance derived from the β changes.

Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting

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Quiz

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting

1 more question available

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Challenge Problems

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting