Hello again,
Wow, it has been a long time since you replied to this thread.
So you want a sine output from the input, but what exactly will the input be?
If you just want a 90 degree phase shift, that's not too hard, but if you want a sine wave from a DC input that's harder to do.
So try to specify what input you are using, and if it could be different then show the way you want to convert it into whatever you want on the output. Show as many cases as possible.
For example,
1vac input, 1vac output 90 degrees
or
1vdc input, 1vac output, then 2vdc input, 2vac output.
The more detail you provide here the more we can help.