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The configuration shown here is almost the same as the inverting configuration: only the input voltage Ve is applied directly to the positive input, and the point A is connected to the ground .
Also in this configuration, the feedback is negative. The linear functioning is hence possible.
In order to calculate the amplification Vs/Ve we use again the ideal op-amp model. Hence we have :
 V+ = V-
I1 = I2 since I- = 0 |
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We can then write :
Vs and Ve have the same sign, the op-amp configuration is “non inverting”.
This relationship Vs(Ve) is valid only as long as the Vs voltage has not reached its saturation values.
The Vs(Ve) characteristic is hence as follows :
Other representations of the non-inverting op-amp configurations better show the voltage divider between the output and the negative input :
