74.5.1. When to Use Differential Amplifiers

Try these first

1. 1.

   What is the primary function of a differential amplifier?

   Hint

   Think about the signals being processed.

2. 2.

   Define common mode rejection.

   Hint

   Focus on what it means to keep certain signals away.

3. 3.

   What is the main purpose of a differential amplifier?

   • A) Amplify single-ended signals
   • B) Amplify the difference between two signals
   • C) Cancel noise completely

   Hint

   Think about how differential amplifiers function in their core purpose.

4. 4.

   True or False: Differential amplifiers cannot reject common mode signals.

   • True
   • False

   Hint

   Consider what role common mode signals play.

5. 5.

   Design a simple differential amplifier circuit for a long-distance audio signal transmission. Explain how it detects and rejects noise.

   Hint

   Consider the functioning of both the true signal and its complement.

6. 6.

   Evaluate the potential consequences of using a differential amplifier with a high common mode gain in a noisy environment.

   Hint

   Reflect on the importance of noise rejection in differential settings.