53.2.1. Performance of the Common Base Amplifier Without Capacitor C_B

Try these first

1. 1.

   What does a common base amplifier do?

   Hint

   Think about the configuration roles.

2. 2.

   Why is capacitor C_B important?

   Hint

   Remember what happens at AC ground.

3. 3.

   What is the impact of removing capacitor C_B on input resistance?

   • Increases significantly
   • Decreases
   • Remains constant

   Hint

   Think about how much voltage appears across different components.

4. 4.

   True or False: The voltage gain improves when C_B is removed.

   • True
   • False

   Hint

   Reflect on the relationship to signal application.

5. 5.

   Given a common base amplifier with a collector current of 0.5 mA and an early voltage of 50V, calculate the transconductance and describe its significance.

   Hint

   Use standard formulae linking collector current and transconductance.

6. 6.

   Investigate how varying the input resistor affects the amplifier's overall gain without C_B. Discuss potential design considerations.

   Hint

   Examine how resistances interact within the circuit.