74.4.2. Differential to Single-Ended Amplifier

Try these first

1. 1.

   What is the primary purpose of a differential amplifier?

   Hint

   Think about its operational advantage over single-ended amplifiers.

2. 2.

   Define common-mode signal.

   Hint

   It is usually unwanted.

3. 3.

   What is the main function of a differential amplifier?

   • To amplify noise
   • To amplify differential signals
   • To suppress all signals

   Hint

   Consider what they aim to achieve in signal processing.

4. 4.

   True or False: Common-mode signals are typically desired in differential amplifiers.

   • True
   • False

   Hint

   Think about the definition of common-mode signals.

5. 5.

   Assume you have a differential amplifier with a differential voltage of 2V and a common-mode voltage of 1V. If the common-mode gain is 0.1 and the differential gain is 50, what will be the output voltage?

   Hint

   Use both the differential and common-mode formulas for output.

6. 6.

   In a single-ended system, you measure a noise voltage that is significantly affecting the signal. Propose a circuit modification using differential signaling to address this issue.

   Hint

   Think about how cancellation works with two signals.