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Simulators >> RF Simulators >> Generate data with jitter
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Message started by littlepig on Feb 17^th, 2009, 6:53pm

Title: Generate data with jitter
Post by littlepig on Feb 17^th, 2009, 6:53pm

Hi all,

It there a way to generate input data stream with the effect of jitter.. I am currently running with Spectre..

Thanks..

Title: Re: Generate data with jitter
Post by Andrew Beckett on Feb 17^th, 2009, 7:57pm

What kind of simulation are you aiming to do? The answer is somewhat dependent on that - it may be that a simple small-signal noise source is sufficient (if doing, say, pnoise analysis) - or you may need a larger-signal source for doing transient. Or you may be doing transient noise?

I think some more details are needed before an answer can be given.

Thanks,

Andrew.

Title: Re: Generate data with jitter
Post by littlepig on Feb 17^th, 2009, 9:55pm

I am trying to do stressed-eye simulation.. It is for high speed digital communication..

Title: Re: Generate data with jitter
Post by Andrew Beckett on Feb 18^th, 2009, 12:59am

I'm not familiar with a "stressed eye" simulation. I've found a few casual references to it from a google search, but didn't have time to research it fully to understand what you mean (I can guess, but I'd sooner know exactly what you mean).

Can you point me at some references so I can understand precisely what you're trying to do? Or if not, explain it here?

Regards,

Andrew.

Title: Re: Generate data with jitter
Post by littlepig on Feb 18^th, 2009, 10:38pm

In optical communication, the receiver signal is corrupted. Stressed-eye diagram is the eye diagram acquire by the worse case input signal that is likely to happen in the system.

Title: Re: Generate data with jitter
Post by pancho_hideboo on Feb 19^th, 2009, 6:13am

littlepig wrote on Feb 18^th, 2009, 10:38pm:

In optical communication, the receiver signal is corrupted. Stressed-eye diagram is the eye diagram acquire by the worse case input signal that is likely to happen in the system.

What type of jitter do you want to realize ?

http://cp.literature.agilent.com/litweb/pdf/ads2008/ccsrc/ads2008/VtPRBS_(Time-domain_Pseudo-Random_Bit_Sequence_Voltage_Source).html
http://cp.literature.agilent.com/litweb/pdf/ads2008/examples/SignalIntegrity/VtPRBS_prj.html

You can create PRBS with jitters similar to the above by Verilog-A.

Title: Re: Generate data with jitter
Post by littlepig on Feb 19^th, 2009, 9:09am

Thanks for the help..
Is there any guide to write it in VerilogA? I am not familiar with VerilogA..

Title: Re: Generate data with jitter
Post by pancho_hideboo on Feb 19^th, 2009, 2:05pm

littlepig wrote on Feb 19^th, 2009, 9:09am:

Is there any guide to write it in VerilogA? I am not familiar with VerilogA..

See　http://www.designers-guide.org/VerilogAMS/

And the followings are useful although they are VHDL-AMS.
http://www.designers-guide.org/Modeling/JTOL_rev1.0.pdf
http://www.designers-guide.org/Modeling/fc_jtol_src_ns.vhd

Title: Re: Generate data with jitter
Post by littlepig on Feb 19^th, 2009, 5:00pm

Thanks..

Title: Re: Generate data with jitter
Post by Ken Kundert on Feb 19^th, 2009, 6:12pm

You might also want to take a look at the models that generate jitter in http://www.designers-guide.org/Analysis/PLLnoise+jitter.pdf

-Ken