Brooke Clarke wrote: > Hi: > > Geller's patent 7382179 Voltage reference with enhanced stability explains > how > he combines the AD587 voltage reference with the LM399 voltage reference to > obtain improved temperature stability. The method can be used with the > LT1000. > http://www.google.com/patents?id=v0GqAAAAEBAJ&dq=7382179 > > However the instability of the AD587 internal resistor network and buffer amplifier would significantly degrade the LTZ1000 performance. > 7380471 Micro gust thermal anemometer is a similar circuit by Geller where > the > LM399 is installed on the PCB using the untrimmed leads so that it's up in > the > air. Any wind changes it's temperature which is seen as an output. > http://www.google.com/patents?id=GDuqAAAAEBAJ&dq=7380471 > > There has to be a better sensor than an LM399 surely. A sensor that isnt nominally temperature compensated should be better. > I found a drawing on the National Semi web site for a Valox plastic shield > for > the LM199, but there's not any other info about it or the specified material. > http://www.national.com/packaging/mkt/h04d.pdf > > The original ones were polysulphone. > Brooke Clarke > http://www.prc68.com > > Bruce
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