26.4.2. Output Port Analysis

Try these first

1. 1.

   What is the main advantage of using self-bias in common emitter amplifiers?

   Hint

   Think about how beta affects circuit operation.

2. 2.

   Define fixed bias in terms of collector current dependency.

   Hint

   Recall what happens when beta changes.

3. 3.

   What is the main benefit of self-bias compared to fixed bias?

   • A) More stability
   • B) Higher gain
   • C) Simpler design

   Hint

   Think about how variations in transistors affect performance.

4. 4.

   True or False: The collector current in a fixed bias circuit does not depend on the transistor's beta.

   • True
   • False

   Hint

   Consider the relationship between bias and beta.

5. 5.

   Given a self-bias circuit with R_B = 20 kOhm, R_E = 2 kOhm, and β = 90, calculate the base current and collector current. Design a guideline for the emitter resistor to achieve stability.

   Hint

   Use Ohm's law to find I_E first from the applied voltage.

6. 6.

   Analyze how the gain of a self-biased amplifier changes with varying emitter resistor values, providing specific examples with calculations.

   Hint

   Recall that voltage gain is inversely proportional to emitter resistor size in self-bias configuration.