23.4.2. Modeling Current Amplifiers

Try these first

1. 1.

   Define a current amplifier.

   Hint

   Think of how inputs and outputs relate to one another.

2. 2.

   What is DC bias used for in amplifiers?

   Hint

   Recall how BJTs need to be set up for proper operation.

3. 3.

   What defines a current amplifier?

   • It uses voltage signals.
   • It uses current signals.
   • It amplifies power.

   Hint

   Focus on the type of signals it processes.

4. 4.

   True or False: Unloaded current gain measures how well an amplifier performs under loading conditions.

   • True
   • False

   Hint

   Consider what 'unloaded' means in this context.

5. 5.

   Design a current amplifier circuit that can achieve a gain of 50 with a load of 200 ohms. What components do you need, and how would you configure them?

   Hint

   Start by calculating the necessary input current based on desired output current.

6. 6.

   Evaluate how the output current of a current amplifier would change if the load resistance is halved. Provide the equation used for your calculations.

   Hint

   Relate the output current change to both gain and new load resistance.