The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Aug 1st, 2021, 11:32pm
Pages: 1
Send Topic Print
good scope for SERDES evaluation? (Read 623 times)
carlgrace
Senior Member
****
Offline



Posts: 231
Berkeley, CA
good scope for SERDES evaluation?
Nov 10th, 2011, 12:25pm
 
Hope this is the right forum for this.  My organization is looking at the possibility of designing high-speed serial links to integrate with out image sensors.  We would need something like 1 - 10 GB or more eventually.  Really this is just a what-if at this point.  I'm not an expert in serial comms so I'm wondering what would be a good scope for testing our homemade SERDES?  Like, for 10 GB/s links, how fast a scope do we need?  Are there specific models designed for this?  Hopefully someone can point me in the right direction before I do too much research and fall down the rabbit hole.

Carl
Back to top
 
 
View Profile   IP Logged
raja.cedt
Senior Fellow
******
Offline



Posts: 1516
Germany
Re: good scope for SERDES evaluation?
Reply #1 - Nov 11th, 2011, 12:46am
 
hello,
for testing at 10GBps if you have 10G BERT, 10G PRBS, signal generator which can support up to 10G and sampling scope is fine i guess for validating internal loopback and external loop back.

Thanks,
raj.
Back to top
 
 
View Profile WWW raja.sekhar86   IP Logged
carlgrace
Senior Member
****
Offline



Posts: 231
Berkeley, CA
Re: good scope for SERDES evaluation?
Reply #2 - Nov 11th, 2011, 10:16am
 
So I got a little more information.  It seems I need a scope with at least 1.5X the bandwidth of the bitrate (based on third harmonic of 1010101 pattern).  So a storage scope with 15 GHz input bandwidth would work.  Can I do the BERT with an FPGA based solution?
Back to top
 
 
View Profile   IP Logged
loose-electron
Senior Fellow
******
Offline

Best Design Tool =
Capable Designers

Posts: 1638
San Diego California
Re: good scope for SERDES evaluation?
Reply #3 - Nov 11th, 2011, 10:20am
 
Homemade SERDES?

LOL!

Why don't you get in touch with the manufacturers representatives for Agilent (HP) Tektronix, LeCroy, etc and ask for their reccomendations.

If its at Bezerkly, then you may be able to cut a deal with them for a free loan or similar.
Back to top
 
 

Jerry Twomey
www.effectiveelectrons.com
Read My Electronic Design Column Here
Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical
View Profile WWW   IP Logged
carlgrace
Senior Member
****
Offline



Posts: 231
Berkeley, CA
Re: good scope for SERDES evaluation?
Reply #4 - Nov 11th, 2011, 10:39am
 
Loose-electron,

You're not wrong about begging... but we borrow so much stuff from Tek and Agilent they complain they are "charitable organizations".  I talked with a guy at Agilent today this morning and I think I know what we need.  It's really not that expensive after all.

And, no, not homemade SERDES, just homemade serial transmitters.  We're running out of pads!  And as you know IP is OUTRAGEOUSLY expensive unless it comes from the foundry.

Carl
Back to top
 
 
View Profile   IP Logged
loose-electron
Senior Fellow
******
Offline

Best Design Tool =
Capable Designers

Posts: 1638
San Diego California
Re: good scope for SERDES evaluation?
Reply #5 - Nov 14th, 2011, 10:14am
 
carlgrace wrote on Nov 11th, 2011, 10:16am:
So I got a little more information.  It seems I need a scope with at least 1.5X the bandwidth of the bitrate (based on third harmonic of 1010101 pattern).  So a storage scope with 15 GHz input bandwidth would work.  Can I do the BERT with an FPGA based solution?


At those data rates you are going to have to set up a parallel data path in something at a lower frequency, and then recombine the signals to make the higher data rate in a specialized device.

Why don't you look around at whats out there already for SerDes xmitters or optical drivers?

At these data rates there is going to need to be pre-emphasis in the Xmit however.

I presume this is research at Cal?
Back to top
 
 

Jerry Twomey
www.effectiveelectrons.com
Read My Electronic Design Column Here
Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical
View Profile WWW   IP Logged
carlgrace
Senior Member
****
Offline



Posts: 231
Berkeley, CA
Re: good scope for SERDES evaluation?
Reply #6 - Nov 16th, 2011, 2:13pm
 
Thanks for the help.  I think we have enough info for our grant proposal.  

Well, it is for research in Berkeley, I guess you could call it "Cal Adjacent".  I work for the University of California, but not for Cal.
Back to top
 
 
View Profile   IP Logged
loose-electron
Senior Fellow
******
Offline

Best Design Tool =
Capable Designers

Posts: 1638
San Diego California
Re: good scope for SERDES evaluation?
Reply #7 - Nov 21st, 2011, 2:27pm
 
ah, got it....
Back to top
 
 

Jerry Twomey
www.effectiveelectrons.com
Read My Electronic Design Column Here
Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical
View Profile WWW   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2021 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.