add offset to AC signal

[meereck]

Hello, i have a sine AC signal ranging from -1V to +1V.
I need to add an offset of 2V so that the resultant signal is 1V to 3V (roughly).
After that, I would like to make a TTL signal out of it.
Can it be carried out by Op-amp and comparator? Any hints on circuit, please?

cheers M.

Added after 1 hours 44 minutes:

I have found so far, the last task might be done with comparator having the negative input at 2.5V and the positive input fed by a sine signal with 2.5V offset.

How to add an offset to an AC signal is still unknown to me.
Any thoughts?
cheers

 

[parra]

You could use an opamp as an adder to put an offset to your AC signal. Just have a look here, this should give you a hint:
**broken link removed**

 

[FvM]

An AC voltage obviously could be also simply AC-coupled to a different DC level, just using a capacitor and two resistances. A square-wave conversion however is performed with better symmetry by a ground reference comparator directly.

 

[meereck]

parra : cheers, looks pretty straight-forward.
FvM : can you please be more specific about AC-Coupling?