51.1.9. Upper Cutoff Frequency Calculation

Try these first

1. 1.

   Define upper cutoff frequency.

   Hint

   Think about where performance drops off in an amplifier.

2. 2.

   What is voltage gain?

   Hint

   Remember the formula for voltage gain.

3. 3.

   What is the upper cutoff frequency in amplifiers?

   • Where output voltage equals input voltage
   • Where output voltage drops to 70.7% of its maximum
   • Where no signal passes

   Hint

   Remember the definition closely tied to performance metrics.

4. 4.

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

   • True
   • False

   Hint

   Reflect on your understanding of input characteristics.

5. 5.

   A common base amplifier has a load capacitance of 100 pF and an output resistance of 10 kΩ. Calculate the upper cutoff frequency.

   Hint

   Remember to convert units properly while plugging into the formula.

6. 6.

   If the source resistance is increased and output impedance is given as 2.83 kΩ; analyze how this would affect voltage gain in practical terms.

   Hint

   Think of how source and load resistances interact.