VCO linearity question

[patchell]

    I don't have any figures, because I have never made any
measurements, but, a typical triangle cco core will have a non linearity
at high frequencies due to the time delay in what ever you use for a
comparator.  The symptom that is most evident is that the amplitude of
the triangle will grow as frequency increases.

Scott Gravenhorst wrote:

> I'm thinking that (generally) a triangle VCO will be
> more linear by making the comparator high impedance and the
> integrating cap should be small?  The small cap will make
> the frequency higher so smaller CV (hence smaller current in
> the CCO core) to compensate would be necessary.  Is "cut and
> try" the best method for determining the optimum cap value?
> I am assuming there is a limit to how small it can go with
> a given design.
>
> BTW, I'm heading out to a HUGE electronic salvage/surplus
> yard today to scavange for AD654 or LM566 (NE too).  Can't
> seem to find anyone that still stocks either of these.
> Yes, I've tried partminer (which is now www.freetradezone.com)
> many many times with only 'out of stock' hits.
>
> Wish me luck.
>

    Good luck on your treasure hunt.

>
> -- Scott Gravenhorst : On The Edge, but the Edge of What?
> -- Linux Rex, Linux Vobiscum  |  RedWebMail by RedStarWare
> -- FatMan: www.teklab.com/~chordman
> -- NonFatMan: members.xoom.com/_XMCM/chordman/index.html
> -- The 21st century does NOT start in the year 2000!!!

--
 -Jim
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