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Sanjib.A
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Very useful articles and tutorials
Sanjib.A   9/20/2013 1:30:58 PM
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All of the technical papers and tutorials seem to be very informative and useful for learning the challenges faced for High Speed Design and possible sollution to those challenges. I have downloaded the paper "Effects of Temperature and Relative Humidity in Transmission Systems Using Differential Signaling." and started scanning through...very interesting!! 

First time before I downloaded I had to register on the DesignCon site.

MeasurementBlues
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Re: Very useful articles and tutorials
MeasurementBlues   9/20/2013 2:18:09 PM
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>First time before I downloaded I had to register on the DesignCon site.

As noted in the first paragraph.

Navelpluis
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Very good to share
Navelpluis   10/4/2013 3:16:38 AM
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Just want to let you know that I find it very good & wise to share this kind of knowledge. It certainly will lead to better products, also from smaller manufacturers like we are.

MeasurementBlues
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Re: Very good to share
MeasurementBlues   10/4/2013 8:07:41 AM
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Navelpluis, did you download any of the papers? If so, which papers? 

Navelpluis
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Re: Very good to share
Navelpluis   10/4/2013 8:47:49 AM
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I downloaded the paper about jitter. This has one of my most interests, the Challenges and Solutions in Characterizing a 10 Gb Device. Here in our lab we try to solve things with old (but affordable) HP equipment: We have an old TDR and network analyzer HP8753C+85046A testset at hand, single ended, but it is possible to do differential measurements with those old beasts. We made some UNBAL devices, broad band transformers, actually with a 50R to 100R pad. (See patent US 5,379,006 or anything that comes close to UNBAL and matching 50R to 100R differential) Not the greatest dynamic range left (35~40dB) but for signals <= 3GHz this worked out fine for us. For jitter measurements we use(d) an old LeCroy scope with their original OS. Wonderful peace of gear, and much lighter to work with in comparison to a scope with WIN-PC frontend. Our scope is a true WYSIWYG.

You might wonder why we do this playing around with old gear? Our year turnover probably is smaller than 1 or 2 new pieces of equipment (TDR or NWA) , in other words, we simply cannot afford those. But we *can* solve high-speed problems for our customers, we have proven that. (see http://ppg.teldevice.co.jp/m_board/images/wb_ug172.pdf as an example, in 2003 I guess. LVDS was rather unknown by then) Today, if signals go higher than 6GHz I throw my hands in the air.... Cannot solve everything.... We find RF and analog big fun !

MeasurementBlues
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Re: Very good to share
MeasurementBlues   10/4/2013 8:55:22 AM
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Navelpluis, please contact me at martin.rowe@ubm.com. I think you have a good story that perhaps we can cover here or at EDN.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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