These are chat archives for nightscout/beta

6th
Nov 2014
PierreVandevenne
@PierreVandevenne
Nov 06 2014 07:20
@benwest the raw isig is not a direct measure of the current. If it was a single measure they would need a 24 or 32 bits ADC and at that level of signal I thought it would probably be overkill (I can't picture 12 or 16db of dynamic range in the interstitial glucose signal - maybe I am wrong - just a gut feeling). That gut feeling made me dig a bit: they subcontracted an asic in their first generation products but now seem to have an in-house team - this dexcom patent is interesting http://www.google.com/patents/US20140266776, especially the "adjustable integration window" part. No definite answer, but pointers on how they do it at least. And they could still be using a 32 bits ADC in their asic knowing it is overkill simply because a drop-in component is available. Or they could be using 8 bits and returning the sum of many measures.
Ben West
@bewest
Nov 06 2014 07:37
nice
interesting