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 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