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# Op-amp

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#### neo_star

##### New Member
What is the difference between an inverting and non inverting configuration of an op amp other than the phase shift that it produces.

What is the difference between an inverting and non inverting configuration of an op amp other than the phase shift that it produces.

hi,
Look thru this pdf for details regarding OPA's.

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I think it just changes the shift to 90 degrees.

The gain formulas:
Non inverting configuration: A= 1+ Rf/Rin.
Inverting configuration: A= - Rf/Rin.

The main difference between these 2 configurations other than 180 degree of phase shift is The input impedance of these configurations. Please take a look at wikipedia and use KCL detect why and how:
Operational amplifier applications - Wikipedia, the free encyclopedia

I think it just changes the shift to 90 degrees.

Ops!
That is not correct. The phase shift is 180 dgree not 90 degree.

Two other differences:

1. The input impedance of the non-inverting amp is very high, equal to the input impedance of the op amp input.
The input impedance of a non-inverting amp is equal to the impedance of the network between the input and the inverting op amp terminal (the virtual ground point).

2. The inverting amp can be sum different signals by adding additional input resistors to the summing junction with no interaction between the inputs. Each input is summed independently of the others.
The non-inverting amp can not be used as a summer without interaction between the two inputs. They are not independent.

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