I respectfully beg to differ. This signal is a square wave which oscillates between 0v and +3.8v.
An AC signal - Alternating Current - oscillates from 0v to some positive voltage, back to 0v, to some negative voltage, then back to 0v. F'rinstance, U.S. line voltage cycles from 0v to +110v, to 0v, to -110v sixty times every second; 60Hz AC.
What I am working with is a DC voltage that is simply being turned on and off very quickly, hence "DC square wave".
The only difference is the reference point you're measuring from - it's an AC waveform. If all you need to do to alter it's DC reference, then feed it through a capacitor.