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Differential Amplifier - The Voltage Subtractor

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The differential amplifier amplifies the voltage difference present on its inverting and non-inverting inputs The differential amplifier is a voltage subtractor circuit which produces an output voltage proportional to the voltage difference of two input signals applied to the inputs of the inverting and non-inverting terminals of an operational amplifier. Thus far we have used only one of the operational amplifiers inputs to connect to the amplifier, using either the “inverting” or the “non-inverting” input terminal to amplify a single input signal with the other input being connected to ground. But as a standard operational amplifier has two inputs, inverting and no-inverting, we can also connect signals to both of these inputs at the same time producing another common type of operational amplifier circuit called a Differential Amplifier. Basically, as we saw in the first tutorial about operational amplifiers, all op-amps are “Differential Amplifiers” due to their input configuration.

The Differential Amplifier is a Subtracting Amplifier The Differential Amplifier, also known as a “difference amplifier”, is basically a voltage subtractor circuit that produces an output voltage which is proportional to the voltage difference applied to its inverting and non-inverting input terminals. In other words, its output is proportional to the difference between its two input signals. Thus far we have used only one of an operational amplifiers inputs connected to the amplifier. Using either the “inverting” or the “non-inverting” input terminal to amplify a single input signal with…

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