When using an op amp that is ac coupled I see a dc path to ground at the input has to exist. The simplest example I can think of is a voltage follower. A dc path can be provided on the + terminal but what about the negative terminal? Rather am I supposed to assume a dc path is provided through the output to the power supply to ground? I using a set up where the op amp's power supply has a path to ground.
Don Lancaster points out it is essential for both inputs to have a path. Lancaster says a dc return path to ground or some other stable dc bias point. I usually think of an output as varying. I suppose it works for the voltage follower.
Don Lancaster points out it is essential for both inputs to have a path. Lancaster says a dc return path to ground or some other stable dc bias point. I usually think of an output as varying. I suppose it works for the voltage follower.