70.3.3. Input to Output Transfer Characteristics

Try these first

1. 1.

   Describe what a single-ended amplifier is.

   Hint

   Think about how many signals it takes in.

2. 2.

   What does a differential amplifier amplify?

   Hint

   Recall the significance of the two inputs.

3. 3.

   What characterizes a single-ended amplifier?

   • A amplifier with two inputs
   • An amplifier with one input referenced to ground
   • An amplifier that amplifies noise

   Hint

   Think about the amplifier's input configuration.

4. 4.

   True or False: A differential amplifier complies more robustly against common-mode noise.

   • True
   • False

   Hint

   Recall the definition of common-mode rejection.

5. 5.

   If you have two input voltages V1 = 12V and V2 = 8V with a differential amplifier gaining 6, what will be the output voltage? Further, if a common mode voltage of 4V is also applied, what is the effect on the output?

   Hint

   Focus on using the gain formula and think about what common voltage implies.

6. 6.

   Discuss the practical implications if a differential amplifier has a very low CMRR. How would that affect its application in a noisy environment?

   Hint

   Think about how noise can affect communication clarity in electronic devices.