Hi Peter

I was just looking at the Linear Tech apnote recently about this so your
data was of interest to me. Your conclusion about using a good current
source is certainly on the mark.  The deltas are so small that they are
easily lost if attention to details is not paid. I would think that the
current source needed should not present a problem. Of course, if you are
looking for rock bottom parts cost, it might be.

The theory does look interesting; Jim Williams writes interesting ap notes.
I do believe as he claims that you can do away with calibration from unit
to unit if you do a good implementation here.

Good luck and please let us know how any further work goes on this. Thanks
for taking the time to fill us in.

Best regards,
Tom M.

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