51.1.7. Output Impedance Calculation

Try these first

1. 1.

   What is output impedance?

   Hint

   Think about what connects to the output.

2. 2.

   What does voltage gain indicate?

   Hint

   It's a ratio of output voltage to input voltage.

3. 3.

   What is the output impedance of a common base amplifier affected by?

   • Input impedance
   • Load resistance
   • Both A and B

   Hint

   Consider how these two aspects interact in a circuit.

4. 4.

   True or False: A high output impedance is desirable in amplifiers.

   • True
   • False

   Hint

   Think about power transfer.

5. 5.

   You have a common base amplifier with a collector resistance of 4 kΩ, and the output resistance of the transistor is 60 kΩ. Calculate the output impedance and discuss its implications for circuit performance.

   Hint

   Apply the parallel resistance formula.

6. 6.

   Given an input capacitance of 15 pF and an output resistance of 2 kΩ, determine the upper cutoff frequency and analyze how it influences bandwidth.

   Hint

   Convert pF to farads before calculations.