DocID026915 Rev 1

3/19

AN4586

Error contributions

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Error contributions

The error contributions which are taken into account in this application note include:

•

Resistor inaccuracies

•

Main op amp contribution which is the input offset voltage (Vio) (see Figure 1).

Figure 1. Input offset voltage

The Vio can be either positive or negative. Also, it can vary with the op amp CMRR, but this

parameter is not taken into account in this document.

In the different configurations below, the output voltage formula is written with and without

the error inaccuracies.

example, it can be 1 %.