[sdiy] Temperature Compensated Exponential Converter Using SSM2164

[David G. Dixon]

Awesome!  Thank you, Sam Hoshuyama!

While the Gurus argue over how well this thing might work, I'm going to
build me a couple!  2164 is advertised to give more than five orders of
magnitude of log conformance, and we only need about three for a VCO, so I'm
not worried.  

What shall we do with the spare pair of VCAs on the 2164?  Another expo in
parallel?  Sine shaper?  Current source for a triangle core?  Hmmm....


> Ian Fritz wrote:
> > At 07:26 AM 8/29/2009, HOSHUYAMA wrote:
> >> Hello List,
> >>
> >> I developed a new style temperature compensation method for
> >> exponential converter using SSM2164.
> >
> >
> > Interesting.  Basically the same as Jim Patchell's old (2002?) design,
> > except using an expo OTA.  How good is the log conformance (tracking)?
> 
> I made the same reflection. Basically Jim's approach, but using a
> SSM2164 as the expo converter. It is much more compact than Jim's
> approach.
> 
> Need to ponder over it a little bit more thought. I must admitt I have
> not used the SSM2164 ever... maybe time to fetch a few and experiment.
> 
> Cheers,
> Magnus