January 16, 2017

What is a differential amplifier? Why use differential amplifiers?

Differential Amplifier:

A differential amplifier is the combination of inverting and non inverting amplifier. The amplifier, which is used to amplify the voltage difference between two inputs-lines, neither of which is grounded, is called differential amplifier. This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the input terminals as the amplifying circuitry rejects it being a common mode signal.
Figure- Differential Amplifier

Uses of Differential Amplifier:

  • Volume Control
  • Automatic Gain Control (AGC)
  • Amplitude Modulation
  • Signal Amplification
  • Controlling of Motors & Servo Motors
  • Input Stage Emitter Coupled Logic
  • Switch


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