[time-nuts] 4046 variations (was EPE GPS....)
magnus at rubidium.dyndns.org
Sun Sep 27 20:54:25 UTC 2009
Javier Herrero wrote:
> Yes, I'm also familiarized with space qualified EEE components, and
> lately I hear the word "heritage" more frequently that I would like ;)
> The only design I've made for aircraft electronics was for a commercial
> aircraft application, and the components selection was a lot less
> restringent than for space (I think also that the system for which I
> worked was also not classified as very critical), so perhaps the
> decision to use a 4046 at its limit was driven by that heritage reasons,
> and that really there was not too much better things around :) The
> venerable 4046 has been around for quite a long time...
Surely would other alternatives to the 4046 be possible even within the
scope of heritage components? DBM and active mixers should be available
and useable. The CCO (it's actually current controlled with a V/I
conversion) could also be replaced. Logical gates can also be used to
replace the phase-detector. Not as handy, but the aspect of the 4046
causing trouble could be circumvented if needed. Another aspect is to
improve its performance by design.
But maybe I misinterprent the heritage aspect her in that it is designs
rather than components that is inherited?
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