Differential Amplifier

Differential Amplifier

1. Produces outputs that are a function of the difference between two input voltages. It has two basic modes of operation:

   • Differential: In which the two inputs are different.
   • Common: In which the two inputs are the same.
     • Formulas

2. Modes of Signal Operation

   • Single-Ended Differential Input: When a diff-amp is operated with this input configuration, one input is grounded and the signal voltage is applied only to the other input.
   • Double-Ended Differential Inputs: In this input configuration, two opposite-polarity (out-of-phase) signals are applied to the inputs.

3. Basic Operation

   • A diff-amp circuit has two inputs and two outputs.

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