Hi Reg I have been keeping a spreadsheet on a number of LM399 refs that I have been running in for over 12 months. The data consists of non-regular spot checks of the zener (~7v) and 10v outputs using a Keysight 34461A. Not sure this it would be of use in your analysis. Lou
On Wed, Aug 28, 2019 at 7:16 AM Reginald Beardsley via volt-nuts < [email protected]> wrote: > > I'm looking for multiyear data from precision voltage references from > initial power on which includes time-date, temperature and voltage. > Relative humidity would also be nice if it is available. > > I am a retired PhD level oil industry research scientist. I spent a > number of years heavily involved in the mechanics of materials. I also > spent several years working on sparse L1 pursuit (aka basis pursuit) > solutions to inverse problems involving the 1D heat equation as it > describes 1D fluid flow in porous media which is important to understanding > the behavior of shallow reservoirs after fracking. > > The aging curve for references appears to be of that general form so I'd > like to take a crack at seeing how accurately I can forecast the aging > drift. Prior experience and testing solutions of the heat equation > indicate that one can make good predictions for a period equal to the > length of the prior history. > > So if anyone has multiyear data and is willing to share the first half of > the series with me I'll see what I can do. It would be helpful though, to > have the full series for a few references with long histories so I can test > myself before submitting the results for general scrutiny. > > In considering integrated circuit device construction, it seems likely > that both the aging drift and the voltage hysteresis caused by thermal > excursions are related to the different coefficients of expansion of gold, > aluminum and silicon at the wirebond. In particular, I suspect > thermoviscoelastoplastic deformation as the mechanism. However, I have > not seen a photomicrograph of an LTZ1000 reference die showing the bonding > details. If anyone knows of such I'd be grateful for a link. > > For reference, Feynman demonstrated thermoviscoelastic deformation at the > Challenger hearing in his famous C clamp and ice water experiment. In the > case of a voltage reference one must also consider plastic deformation to > be able to account for a permanent change in the value. > > Thanks, > Reg > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
