51.2. Next Example with Practical Source Resistance

Try these first

1. 1.

   What is the voltage gain of a common base amplifier if the transconductance is 30 mS and the load resistance is 2kΩ?

   Hint

   Multiply transconductance by resistance to get gain.

2. 2.

   Define input impedance in the context of common base amplifiers.

   Hint

   Think about how it affects the signal source.

3. 3.

   What is typically true about the input impedance of a common base amplifier?

   • Low
   • High
   • Medium

   Hint

   Think about signal interaction with the circuit.

4. 4.

   True or False: The upper cutoff frequency depends on the device's source resistance.

   • True
   • False

   Hint

   Remember how resistance affects signal clarity.

5. 5.

   A common base amplifier must maintain a voltage gain of 150 with source resistance of 5kΩ. If the desired load resistance is 1kΩ, calculate the required transconductance.

   Hint

   Adjusting R_C will be key to achieving the desired outcome.

6. 6.

   How will increasing source resistance impact the upper cutoff frequency in a common base amplifier setup? Demonstrate with calculations.

   Hint

   Track how different resistances affect your frequency response.