51.1.2. Numerical Example of Common Base Amplifier

Try these first

1. 1.

   What is the primary function of a common base amplifier?

   Hint

   Think about the input and output connections.

2. 2.

   How do you calculate the emitter voltage in a common base amplifier?

   Hint

   Recall that V_BE is typically around 0.6 V.

3. 3.

   What is the primary output connection in a common base amplifier?

   • Emitter
   • Base
   • Collector

   Hint

   Think about the structure of the amplifier.

4. 4.

   True or False: The common base amplifier has high input impedance.

   • True
   • False

   Hint

   Recall the definition of input impedance.

5. 5.

   Design a common base amplifier circuit for a specific gain requirement of 50, given certain transistor parameters, and calculate the necessary resistance values.

   Hint

   Follow the calculations step by step from the gain formula.

6. 6.

   Evaluate the effect of a 5 kΩ and a 20 kΩ source resistance on the voltage gain of the common base amplifier calculated earlier and discuss the outcomes.

   Hint

   Consider the relationships of resistances in the gain formulas.