70.5.2. Common Mode Gain

Try these first

1. 1.

   What is a single-ended amplifier?

   Hint

   Think about how this amplifier relates to something we know as ground.

2. 2.

   Define differential mode signal.

   Hint

   What do we want to measure when amplifying in a differential amplifier?

3. 3.

   What is the function of a differential amplifier?

   • Amplifies a single input signal
   • Amplifies the difference between two signals
   • Amplifies common mode signals

   Hint

   Consider the unique function that a differential amplifier offers.

4. 4.

   True or False: Common mode gain should be maximized for effective performance in differential amplifiers.

   • True
   • False

   Hint

   Think about the goal for a clean signal.

5. 5.

   If you have two input signals, V1 = 3V and V2 = 1V, calculate the differential signal. If the common signal is 2V, what is the output?

   Hint

   Differentiate between input and common values.

6. 6.

   Create a simple circuit design for a differential amplifier with known resistor values that optimize for minimal common mode gain.

   Hint

   Use configurations that have feedback paths to maintain stability.