Non Inverting Amplifier Equation. The output impedance of an op amp is expressed as z out z o 1 a ol β. In the previous inverting amplifier tutorial we said that for an ideal op amp no current flows into the input terminal of the amplifier and that v1 always equals v2.
The non inverting amplifier configuration is one of the most popular and widely used forms of operational amplifier circuit and it is used in many electronic devices. This was because the junction of the input and feedback signal v1 are at the same potential. For a non inverting amplifier the feedback factor is given as.
Non inverting operational amplifier configuration.
6 being an ideal op amp we can consider that the non inverting input is at the same potential as the inverting input so v 0v. The output impedance of an op amp is expressed as z out z o 1 a ol β. Equation 5 is the loop equation for r1 v1 and vin. Using this formula we can conclude that the closed loop voltage gain of a non inverting operational amplifier is av vout vin 1 rf r1 so by this factor the op amp gain cannot be lower than unity gain or 1.
