[sdiy] I have found that SSM2210 transistor arrays give better performance in my latest oscillator design.

[Ian Fritz]

At 09:34 PM 6/24/2006, scottnoanh at peoplepc.com wrote:
>OK, here's something I've never seen mention of: tuning out sharpness at the
>high end of a VCO.
>
>Using  Rossum  compensation, the VCO tracks really well until one gets to
>between 60 to 15360 Hz, but it goes goes quite sharp from 60 to 30 Hz:  29
>cents =-(.  Tuning that out leaves the oscillator going sharp starting at
>around 960 Hz or so.
>
>Has anybody had an expo converter go sharp at the top end?  If so, how does
>one compensate for that?


Yeah, I wrote up an article on that for EN (1979).  I found that all my 
expo converters had small HF oscillations, that caused overtracking at the 
very top end.  Killing the oscillations straightened out the curves.  So 
that would be a good place to look first.

   Ian