DIFFERENTIAL AMPLIFIER

Differential Amplifier

• The name for an electrical amplifier that boosts the difference between two input frequencies is a differential amplifier.
• Usually, these differential amplifiers have two ends, one that inverts the signal and one that does not.
• The – and + signs show which of these endings inverts and which does not.

Differential Amplifier Circuit

• You can think of the differential amplifier as an analogue device with two inputs and one output.
• Below is a picture that shows how the differential amplifier circuit can be shown.
   

IMAGE SOURCE

Differential Amplifier

• The difference between the two incoming levels tells the differential amplifier how much power to send out.
• In the form of an equation, this can be shown:
   
  
  

IMAGE SOURCE (THUMBNAIL)