27.3.1. Determining Input Resistance

Try these first

1. 1.

   What is the formula for input resistance in a common emitter amplifier?

   Hint

   Think about the components involved at the input terminal.

2. 2.

   What role does the emitter resistor play in a common emitter amplifier?

   Hint

   Consider how it affects beta variations.

3. 3.

   What does input resistance (R_in) affect in the amplifier circuit?

   • Signal handling
   • Output frequency
   • Power dissipation

   Hint

   Think about its role at the input terminal.

4. 4.

   True or False: The emitter resistor (R_E) increases the gain of a common emitter amplifier.

   • True
   • False

   Hint

   Recall the trade-off of R_E.

5. 5.

   Design a common emitter amplifier circuit that can effectively handle input signals while maintaining stability against variations in beta. Discuss specific component values.

   Hint

   Focus on the design principles and trade-offs you've learned.

6. 6.

   Consider a transistor whose beta varies significantly. How would you ensure that your amplifier remains functional? Provide design tweaks and considerations.

   Hint

   Explore the stability concerns and methods to counteract them.