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Inverting Amplifier

An inverting amplifier is an operational amplifier where the output voltage changes in an opposite direction to 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 the ratio resistances in the amplifier. The output voltage equals the negative of the input voltage times the ratio resistances in the amplifier.

Formula

{QuantityVariable[Subscript["V", "out"], "ElectricPotential"] == -((QuantityVariable[Subscript["R", "2"], "ElectricResistance"]*QuantityVariable[Subscript["V", "in"], "ElectricPotential"])/QuantityVariable[Subscript["R", "1"], "ElectricResistance"]), QuantityVariable["A", "Unitless"] == QuantityVariable[Subscript["R", "2"], "ElectricResistance"]/QuantityVariable[Subscript["R", "1"], "ElectricResistance"]}

symbol description physical quantity
Vout output voltage "ElectricPotential"
R1 resistance 1 "ElectricResistance"
R2 resistance 2 "ElectricResistance"
Vin input voltage "ElectricPotential"
A voltage gain "Unitless"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Inverting Amplifier"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Inverting Amplifier"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ResourceObject["Inverting Amplifier"], {QuantityVariable[ \!\(\*SubscriptBox[\("R"\), \("2"\)]\),"ElectricResistance"] -> Quantity[9000, "Ohms"], QuantityVariable[ \!\(\*SubscriptBox[\("V"\), \("in"\)]\),"ElectricPotential"] -> Quantity[1, "Volts"]}]
Out[3]=

Source Metadata

  • Creator:
  • Date: 1941

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