47.4.4. Output Impedance with Source Resistance

Try these first

1. 1.

   What is output impedance?

   Hint

   Think about how the amplifier interfaces with the load.

2. 2.

   What does transconductance (g_m) signify?

   Hint

   Consider its role in operational efficiency.

3. 3.

   What does a high output impedance indicate?

   • Better power transfer
   • Increased loading effect
   • Ideal for all loads

   Hint

   Consider how it affects the load connected.

4. 4.

   Is the voltage gain of a common collector amplifier always close to unity?

   • True
   • False

   Hint

   Think about the role of the common collector configuration.

5. 5.

   Given a common collector amplifier with a collector current of 1 mA, and an early voltage of 50 V, calculate the output resistance.

   Hint

   Relate your answer to the concept of output resistance associated with active devices.

6. 6.

   Analyze the effect of introducing a 50 kOhm source resistance into a common collector configuration. How would the performance metrics change?

   Hint

   Consider the interactions between source resistance and the amplifier's output.