Op Amp -- Level translation -- Referencing difference of the INP voltages to GND or Neg-Rail

although it's quite basic and simple stuff --
then some while ago i actually managed not to see it as such , in a particular
app , where the difference of the input voltages had to be referenced to Neg-Rail
( what made it so hard to see is that usually you work with 1 signal at the time . . .
here we had 2 inputs . . . )

a long story short ►

1572206052277.png



fig.1

the S_Ref can be whatever : GND , Neg_R (as in my case) , Pos_R , e.c. ...

1572206067441.png

1572206074480.png

fig.2

...

...

...

Sometimes the simple things are too simple to see

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