[time-nuts] V standards

[Bruce Griffiths]

Brooke Clarke wrote:
> Hi Dick:
>
> I got the impression that the tempcos of the two parts were different and by 
> blending them the resultant was lower than either (zero for the set point).
>
> Have Fun,
>
> Brooke Clarke
> http://www.prc68.com
>
>   
Brooke

Its actually a crude attempt to avoid using a pair of precision ratio
tracking resistors.
This works best when the external reference voltage is close to that of
the AD587 internal zener voltage.
With an LTZ1000 the degradation of the the LTZ1000 performance is
significant.
You still need 3 precision resistors to set the LTZ1000 zener current
and chip temperature.

Bruce