[SI-LIST] Re: How much stop frequency is enough for PCB model extraction in HDMI and USB interface ?

Hello Yardala,
Take a look at any school book on SI.  A hint, you need to be concerned with 
harmonics up to 5th in most applications.
Regards,
-Jory


________________________________
From: yardala <yardala@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Sat, December 18, 2010 9:07:04 AM
Subject: [SI-LIST] How much stop frequency is enough for PCB model extraction 
in 
HDMI and USB interface ?

Hi,
When we use EM solver to extract  PCB model, the stop frequency is
usually set as knee frequency ( 0.5 /Tr).
for example, Let Tr =200ps of single end signal , then we set sweep stop
frequency at 2.5GHz.
but in differential HDMI or USB interfact, how to set this stop frequency
efficiently?

For example, we target at HDMI 1080P / deep color, the data rate around
2.225 Gbps, I don't know the signal
rise time, when we want to extract a PCB  S-model of HDMI  channel.
How to decide the stop frequency is good enough ?

Which is the major consideration,  signal rise time or data rate ?

Thanks for any advices.

Yardala


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