23.9.2. Practical Application of Amplifier Models

Try these first

1. 1.

   Define a current amplifier.

   Hint

   Think about what the input and output signals are.

2. 2.

   What is the purpose of DC biasing in amplifiers?

   Hint

   Consider where we want the transistor to operate.

3. 3.

   What is the function of DC biasing in a current amplifier?

   • To amplify voltage
   • To ensure active operation
   • To reduce output noise

   Hint

   Consider the operational state of the transistor.

4. 4.

   True or False: The loading effect increases the output current of the amplifier.

   • True
   • False

   Hint

   Reflect on how added load affects current flow.

5. 5.

   Design a current amplifier with a specified gain of 10. Explain how you would set up the DC bias and loading resistances.

   Hint

   Use the gain formula and basic principles of circuit design.

6. 6.

   A current amplifier feeding into a load resistance of 1k ohm shows a 20% drop in output current. Calculate the unloaded current gain given the input current.

   Hint

   Use the relationship equations discussed in the section.