Fast VCOs/V->F converters

[Karl Helmer Torvmark]

Hi!

I've been thinking about doing a wavetable oscillator project lately, and
like several others people have remarked, getting a fast enough VCO to
drive it is difficult.

However, I've just looked through my favorite Linear Technology appnote
(AN14 - Designs for High Performance V-to-F converters), and the "Fast
Response 1Hz->2.5MHz V->F converter" design looks promising. Now, how do
we convert this from a V->F to a I->F converter (so we can use a regular
expo. converter)? Anybody with more analog design experience that me care
to comment?

If it can be made to work, it can provide 20Hz-20kHz bandwidth with a 64
byte wavetable with speed to spare, also fast response ensures you can use
FM on it as well. Linearity of the V-F itself is spec'ed to 0.05%.

-----------
Karl H.
(In the land of having so much to do (exams) that he won't be able to test
this for a while... :-(