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Brad Albing
Brad Albing
6/4/2013 8:27:22 PM
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Re: design collaborations
@analoging >>foundries are collaborating more with design firms to improve their product design kits (PDK).... Someone should write a blog that speaks specificially to that collaboration process, the benefits, etc. Any takers?

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analoging
analoging
6/3/2013 10:14:09 PM
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design collaborations
Whether it be PCBs or chips themselves, foundries are collaborating more with design firms to improve their product design kits (PDK) since their main expertise lies more on the wafer process and integration side of manufacturing. It is a win-win for both sides and these companies do not directly compete and synergistic benefits can be derived. Mentor Graphics and TSMC are a good example.

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eafpres1
eafpres1
5/31/2013 7:33:37 PM
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Re: If you really, really, need accurate time
Hi Sunita--the only commercial one I'm aware of is the Symmetricom part:

Symmetricom CSAC

It might be of interest that Symmetricom is in the Smithsonian regarding this part:

Smithsonian page CSAC

The NIST experimental version is also on display:

NIST Chip Scale Atomic Clock

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SunitaT0
SunitaT0
5/31/2013 7:05:52 PM
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Re: speed and PCB lengths
but I could add that if running parallel lines, another key would be to ensure the data lines are of the same length.

@RedDerek, true. Running parallel lines definitely helps us to make sure that data arrives at the same time. But we need to make sure that cross talk doesnt happen if two signals are running parallel. Shielding needs to be done to make sure that cross talk doesnt happen.

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SunitaT0
SunitaT0
5/31/2013 7:02:47 PM
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Re: If you really, really, need accurate time
Speaking of clocks and timing, I just came across this article: NIST Scientists awarded Rank prize


@eafpres, thanks for sharing this info. Accurate  chip-scale atomic clock are very helpful in navigating locations where a global positioning system (GPS) doesn't work. I am curious to know if this technology is already commercialized ?

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eafpres1
eafpres1
5/31/2013 4:25:11 PM
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Re: If you really, really, need accurate time
@Brad--at least the guys getting the award are still alive!

If I'm not having another "episode" I estimate the drift at 150μs per year.

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Brad Albing
Brad Albing
5/31/2013 4:12:06 PM
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Re: If you really, really, need accurate time
@eafpres >>The award was for development of chip-scale atomic clocks back in 2004. Hmm - 9 years ago. Wonder if the work for which they won is still relavant (not withstandin the fact that Symmetricom is still marketing product)....

Still, that's prety good accuracy.

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Brad Albing
Brad Albing
5/31/2013 4:09:17 PM
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Re: speed and PCB lengths
@RedDerek - that trick with the PC board traces is where you need to start when dealing with these timing issues. Then you pursue some of the ideas that Mr. Beaver talks about. Important to keep in mind that if you are the analog design engineer on the project, you will need to help the digital guys deal with the subtleties involved here. They will likely be the victims of confused thinking.

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eafpres1
eafpres1
5/31/2013 2:52:21 PM
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If you really, really, need accurate time
Speaking of clocks and timing, I just came across this article:

NIST Scientists awarded Rank prize

The award was for development of chip-scale atomic clocks back in 2004.  The article indicates some are commercialized now.  Here is one from Symmetricom:

Symmetricom CSAC

This part has a short-term accuracy of 5 parts in 10-12

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RedDerek
RedDerek
5/31/2013 12:08:53 PM
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speed and PCB lengths
Not too familiar with JESD204B, but I could add that if running parallel lines, another key would be to ensure the data lines are of the same length. Thus ensuring all data to arrive at the same time. This is a practice on many PC motherboards.

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