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INA198 How to measure Nonlinearity

Jose Delgado
Prodigy 225 points
Other Parts Discussed in Thread: INA198

Hello,

How does TI do this test?

 

Thanks,

 

JD

  • 0
    TI__Mastermind 29740 points

     

    INA198_Nonlinearity.xlsx

    JD,

    Nonlinearity is used to measure the "curvature" of the Gain transfer function, which ideally should be  a straight line passing through (0,0) on a two-D plot, with a slope of 100 in the case of INA198. In reality it is probably not an ideal straight line. Nonlinearity is useful in characterizing this deviation

    Out of cost considerations, normally the mid-point of the input range is selected for measuring nonlinearity. I have included a spread sheet with hypothetical numbers but it illustrates how this parameter is calculated. Hope I answered your question.

    Guang

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