david.royle

IBIS-AMI edges too fast for s-parameter bandwidth

Discussion created by david.royle on Jul 29, 2011
Latest reply on Aug 3, 2011 by weston_beal

Folks,

 

I have a device whose IBIS-AMI model produces a 1-2ps rising edge (inferring hundreds of GHz of bandwidth) . However, my s-parameters (QSFP connector for example) are only characterized to 20GHz (and with warnings not to simulate risetimes more than 25ps).

Does Hyperlynx handle this gracefully, like looking at a 250GHz signal with a 20GHz scope, or will I expect aliasing to render the 20GHz bandlimited result unreliable?

 

The s--parameter notes also caution that, even with risetimes > 25ps,  the time resolution of 25ps is not adequate for most time domain simulations unless "tricks such as windowing are used to minimize leakage and aliasing".

Does Hyperlynx include these tricks?

 

Thanks,

Dave

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