[SI-LIST] Re: timing in s-parameters
- From: David Vye <david.vye@xxxxxxxxx>
- To: Arpad_Muranyi@xxxxxxxxxx
- Date: Thu, 4 Sep 2014 20:18:51 -0400
Cascading s-parameters is fairly straight forward for most EDA tools. You
need to be concerned with the source of the s-parameters (modeled or
measured) and the accuracy with which they were derived. If your analyzing
them in the time domain, you will also want tools that enforce
causality/passivity.
This link covers some of the basics regarding requirements for using
s-parameters in time domain simulations.
http://space.ednchina.com/Upload/2009/6/3/0a40b853-3b4a-42d3-820e-67241743cd1d.pdf
BEst,
David
On Thu, Sep 4, 2014 at 3:25 PM, Muranyi, Arpad <Arpad_Muranyi@xxxxxxxxxx>
wrote:
> Eric,
>
> S-parameter data is made up of complex numbers, so phase information
> (delay) is in there.
>
> Theoretically you can cascade (connect in series) S-parameter blocks
> but there are things to watch out for when you do that. As a user
> you can't do much about it, this is more of an EDA vendor thing. I
> would highly recommend my employer's product, HyperLynx, which has a
> lot of good features and capabilities with S-parameters.
>
> Thanks,
>
> Arpad
> ======================================================================
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of eric silist
> Sent: Thursday, September 04, 2014 2:06 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] timing in s-parameters
>
> I know in a simple way that S-parameters are a frequency domain
> representation of how much of the signal passes through or is reflected.
> Then I have the idea that I could use a tool to extract an S-parameters
> representation of a bus and simulate that in the time domain with h-spice
> or some other tool.
> I don't understand how delay information is derived from the data in a
> s-parameter model? Or is it not and a simulation like I describe above
> will just assume that all channels have the same delay. I thought maybe
> there would be some phase information in the s-parameter model but I didn't
> see that in the touch tone file format.
>
> I'm also curious if I wanted to combine several sparameter models, say a
> package model, channel model, connector model etc. Are there pitfalls
> (like resonant spikes or something) to watch out for if I just hook them
> all up in series? Should I be doing something more complicated to combine
> them?
>
>
> Thank you,
> -Eric
>
>
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