in many circuits (Amplifiers, Filters etc) at the input terminal I saw a sinusoidal voltage together with a DC term, i.e. a voltage like v(t) = sin(wt) + 1 [V]. We may imagine that this signal is produced by the series between an AC voltage source and a DC voltage source, as shown in the following picture:
Now my questions are:
1) I saw the previous scheme in a lot of theoretical analysis of circuits. But is it physically possible to connect an AC voltage source and a DC voltage source in that way? Or is there the risk of damaging them?
2) If this connection is allowed, is it ok for any frequency? May for instance an AC radiofrequency voltage source create a disturb on a DC voltage source?