51.1. Common Base and Common Gate Amplifiers (Contd.): Numerical Examples (Part A)

Try these first

1. 1.

   What does a common base amplifier primarily do?

   Hint

   Think about its application and its characteristics.

2. 2.

   How is voltage gain expressed in terms of input and output voltages?

   Hint

   Recall the definition of voltage gain.

3. 3.

   What is the primary feature of a common base amplifier?

   • High input impedance
   • Low input impedance
   • Medium input impedance

   Hint

   Recall how the base terminal interacts with the signals in this amplifier configuration.

4. 4.

   True or False: The output impedance of a common base amplifier is generally very high.

   • True
   • False

   Hint

   Consider the calculated output impedance from earlier calculations.

5. 5.

   Given a common base amplifier with a collector current of 1 mA, calculate the operating point and the output voltage if the load resistor is 3 kΩ and the supply voltage is 10 V.

   Hint

   Utilize Ohm's Law to relate current and voltage across the load resistor.

6. 6.

   How would an increase in the Early voltage affect the output impedance of a common base amplifier? Discuss.

   Hint

   Reflect on how Early voltage defines transistor behavior in active regions.