51.1.8. Input Capacitance Calculation

Try these first

1. 1.

   Define common base amplifier.

   Hint

   Look for its operational characteristics related to impedance.

2. 2.

   What does voltage gain represent?

   Hint

   Think about how it represents amplifier efficiency.

3. 3.

   What is the typical input impedance of a common base amplifier?

   • High
   • Medium
   • Low

   Hint

   Recall the characteristics of the amplifier configuration.

4. 4.

   True or False: The voltage gain of a common emitter amplifier is generally higher than that of a common base amplifier.

   • True
   • False

   Hint

   Consider the characteristics and applications.

5. 5.

   Design a common base amplifier circuit for a low-noise application, specifying the required voltage gain and input impedance. Justify your component choices.

   Hint

   Focus on real-world applications requiring specific impedance matching.

6. 6.

   If a common base amplifier has an input capacitance of 15pF and an upper cut-off frequency of 100 MHz, what changes would occur if the input capacitance doubled?

   Hint

   Recall the RC time constant behavior as capacitance changes.