Thanks for everyone's comments. As I said, I'm not actually doing anything with this right now, it's more of a theoretical interest. In essence, I'm interested in knowing if there is a passive way to remove a bias voltage from a signal without changing it's shape. Reading on wikipedia, it...
Suppose you want to look at a square wave signal riding on top of a large DC bias. This seems like it should be simple, but I was thinking about this today and I don't know how to do it.
Normally, one would remove a DC offset with a high-pass filter (or just a capacitor). However, with a...