Noninverting Amplifier
A noninverting amplifier is an operational amplifier where the output voltage changes in the same direction as the input voltage. An operational amplifier (often op-amp or opamp) is a DC-coupled, high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.
The voltage gain equals 1 plus the ratio resistances in the amplifier. The output voltage equals the input voltage times 1 plus the ratio resistances in the amplifier.
Formula
![{QuantityVariable[Subscript["V", "out"], "ElectricPotential"] == (1 + QuantityVariable[Subscript["R", "2"], "ElectricResistance"]/QuantityVariable[Subscript["R", "1"], "ElectricResistance"])*QuantityVariable[Subscript["V", "in"], "ElectricPotential"], QuantityVariable["A", "Unitless"] == 1 + QuantityVariable[Subscript["R", "2"], "ElectricResistance"]/QuantityVariable[Subscript["R", "1"], "ElectricResistance"]}](https://www.wolframcloud.com/objects/resourcesystem/marketplacestorage/resources/45f/45f1f801-58e0-4f19-8577-221a31c2f960/Webpage/FormulaImage.png "Copy to Clipboard")
| symbol | description | physical quantity |
|---|---|---|
| Vout | output voltage | "ElectricPotential" |
| R1 | resistance 1 | "ElectricResistance" |
| R2 | resistance 2 | "ElectricResistance" |
| Vin | input voltage | "ElectricPotential" |
| A | voltage gain | "Unitless" |