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

[scottnoanh at peoplepc.com]

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?

Thanks,
Scott


----- Original Message -----
From: "René Schmitz" <uzs159 at uni-bonn.de>
To: "Paul Perry" <pfperry at melbpc.org.au>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 24, 2006 8:01 PM
Subject: Re: [sdiy] I have found that SSM2210 transistor arrays give better
performance in my latest oscillator design.


> Hi Paul and all,
>
> Paul Perry wrote:
> > I'm not an EE, but I'm suprised there isn't some clever
> > way to (exactly or approximately) cancel out the Rbe.
> > Anyone? I'm sure EDN would publish it...
>
> Well there is: Rossum compensation. (and variants...)
>
> Cheers,
>   René
>
> --
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
>
>