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Yes for standard of equalization scheme

Rookie

Yes, worked with optimisation software from oscilloscope

Rookie

good presentation with more explanatio.

 

Rookie

 

 I seriously objected to a standard was back in 2002 when I first got mixed up in this jitter stuff. A test company had managed to put a compliance technique in a standard that could only be performed on their equipment. Good for their sales, bad for everyone else--as monopolies usually are.

Rookie

I was late to the party.  Looks like a good presentation.

I tried measuring connectorized FR4 backplane S-parameters (your slide 13) back in the day when 1Gbps Fibre Channel was leading edge.  My intent was to import the s-parameters into ADS for simulation of signal performance, specifically eye patterns.  I never could get good correlation between the simulated system performance and real measured system performance. 

 

CEO

"The first time I seriously objected to a standard was back in 2002 when I first got mixed up in this jitter stuff. A test company had managed to put a compliance technique in a standard that could only be performed on their equipment."

Wavecrest

 

CEO

It was either the underscore or my complete name, I am advocate of less is more :)

My question was more in the sense of understanding if we could drop the requirement to have a receiver internal eye monitor at very high bit rates and rely only on SW routines to evaluate how wide an eye would be at the receiver slicer? I believe the embedded eye scan/monitor may have some advantages especially with PVT handling but it would also come with some costs...

Rookie

The first time I seriously objected to a standard was back in 2002 when I first got mixed up in this jitter stuff. A test company had managed to put a compliance technique in a standard that could only be performed on their equipment. Good for their sales, bad for everyone else--as monopolies usually are.

I agree with Ecoguy, but one can make a strong case that if interoperability is the goal, then it's easier to attain if everyone does similar things.

Thank you. THis was good information to apply. 

Rookie

I don't think standards should include equalization schemes. The end goal is to deliver the data, how we manage to deliver the data within the defined parameters (standard) should be left to the ingenuity of the engineers. 

Rookie

Can you rely on emulated or "embedded" equalization schemes? Well, what else can you do?

Trust me, I won't lead you astray. Really, you'll loving owning this fine bridge.

Hi nm_martins (I might invoke an underscore in my name, too, I thought about going with Ranso4m at one point, but people kept pronouncing the 4)

Ahem. SW routines in scopes, BERTs, etc that reproduce EQ schemes are perfect. They do exactly what you ask them to do. The problem is that EQ schemes in parts aren't perfect.

The thing about testing EQs without knowing what they do it to challenge them. Stress them with signals that might make them cough.

>>Yes, if standards bodies would only define the perfect lifestyle for every form of life we could just enjoy our utopia.

Sounds like fodder for your next novel Ransom...

Blogger

Another great talk Ransom. Any idea of how good SW routines running in scopes, BERTs and the likes are modelling the actual implemented equalizers? Can we rely on them to assess eye opening at the RX end with a reasonable degree of confidence or should we target embedded eye scan?

 

 

Rookie

Yes, if standards bodies would only define the perfect lifestyle for every form of life we could just enjoy our utopia.

FYI, the archived audio is now available if you missed something or want to listen again...

Blogger

Ah, thanks for your input Ransom. I learned about EQs in school and there's just so many things going on with them. It just seems so complicated to test them without someone knowing their internal structures.

I get an echo when Janine and I are talking, too.

If they include everything, standards will simplify our lives :)

Rookie

>>@tunaterter it might be when you go off of mute, Janine, and Ransom's voice feeds back from your speakers?

Actually my speakers are all silenced, so it is a mystery.

Blogger

Reminds me of the time, a couple of years ago at DeisgnCon on the opening night jitter panel we were discussing the role of standards bodies and someone in the audience proclaimed standards bodies as "hi-tech socialism."

We got a good laugh but it made us think, too.

My position on standards bodies is that they should define performance criteria that assure interoperability of parts and leave the how to test and how to design to the companies.

Hi Vicnesh,

You have point.
>> Standards should define EQs because they are an important part of the receiver and effects not only the BER but also the transient response of the RX

But I'm not sure it's the role of a standards body to dictate design.

thanks Yes in real life it looks like a black box.

Rookie

I've seen internal, built-in test tools that present a limited eye diagram, but I don't think they're so common that we can assume most part will have them. I'm also not sure how accurate they are; not to question their accuracy, just that I don't know.

Thank you all Have a great day

THEO

Rookie

Time just flew by, good presentation Ransom!

Rookie

Hi Atroncoso, Internal tools are great.

Thanks Ransom....another good presentation!  Looking forward to tomorrow's lecture.

Rookie

Standards should define EQs because they are an important part of the receiver and effects not only the BER but also the transient response of the RX

Thanks again Ransom for the lecture.

Rookie

Thanks everyone!

Tomorrow we'll roll up our metaphorical sleeves..

It might be when you go off of mute, Janine, and Ransom's voice feeds back from your speakers?

Rookie

Are internal SerDes Eye tools appropriate for verfication?

Rookie

Thanks, Ransom and Janine.

Rookie

Thank you.  A very good presentation.

Rookie

Thanks, Ransom & Janine. 

Rookie

Thank you for today's lecture Ransom

 

Rookie

Thanks Ransom and Janine.

Rookie

It is a black box.

 

Rookie

Does slide 28 have any diagram as it looks like a black box?

 

Rookie

Is it really a black box in the receiver in slide 28?

Rookie

for a moment I thought that there was an error on slide 28

Rookie

Do you think standards should define equalization schemes?

Blogger

School, many decades ago...

Rookie

It will also help to visualize in the frequency domain

Rookie

Ransom's wondering if you've ever actually performed a Laplace transform? If yes, when did you last do it?

Blogger

Yes, we use pre-emphasis.

Rookie

Anyone using pre-emphasis in their designs?

Blogger

Good evening from Bremen, Gr

Rookie

Have you ever used optimization or minimization software? If yes, what did you thnk.

Blogger

good day from Ottawa, Canada

Rookie

Here we go Audio is live!

Rookie

Hello from Santa Clara, CA.

Rookie

A delta function is perfectly flat/white in frequency space but perfectly narrow in time --> the exact opposite of a sine wave.

So delta function gives position and a sine wave, well, really exp(jkx), gives something flat in space and narrow in frequency.

Hi ALL; Good Afternoon!

Rookie

Dirac formulated the delta function so that he'd have a mathematical description for a particle at a precise position. delta(x-x0) describes the position of a particle at x0.

delta(x-x0) = 0 everywhere except x=x0 where it is infinite, but infinite in such a way that the integral is 1.

 

Greetings from Toronto ON and hello everyone.

Not to much traffic on the super highway.

Theo

Rookie

Janine posed the trivia question: Why did Paul Dirac formulate the "Dirac delta function"?

Here's a hint: he needed a tool to complement the description of a sinusoidal wave.

Today's the day we learn how to open the eye. Come ready with your questions!

Blogger

Thunderstorms here in NJ!

Blogger

The streaming audio player will appear on this web page when the show starts at 12:00 pm  Eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.

Blogger

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

Hello Again from steamy Boston!

Rookie

Hello from Huntsville, Al

Rookie

I think of it as a sampling function.

Rookie

From what I remember, it is a simplified way to represent and impulse fuction ?

Rookie

Hello! Here's some extra credit for early risers. Ransom has a trivia question for you: Why did Paul Dirac formulate the "Dirac delta function" ??

Blogger


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