I am trying to feed this voltage measured by the oscilloscope to a voltage comparator. By design the voltage should swing between +0.7 and -0.7. BUT since the voltage is not referenced to ground I am really having a hard time wrapping my head around what should be connected the comparator, and HOW should I connect them.
Since the voltage am trying to feed to the comparator is not referenced to ground, I can't just get away with connecting the op-amp negative rail to ground right?
Just bear with me one more moment, what I am trying to say is if for instance I feed a signal that has a magnitude of 0.7 does that mean it's 0.7 higher in voltage than the op amp ground, or is it independent of the op-amp ground? I mean if for instance I connected the comparator negative rail to 0.7V and then feed a 0.7 to any of the inputs would I be effectively feeding the op-amp 0 volts since they are both at the same level. So I guess what am trying to ask is, what are the relation between the + and - rails of the op-amp to it's inputs. what should I connect the - and + rails of the comparator. I am really confused about what a ground represent in this case.