[SI-LIST] Re: USB cable model
- From: olaney@xxxxxxxx
- To: ron@xxxxxxxxxxx
- Date: Thu, 7 Jun 2007 16:41:24 -0700
This is a very big hammer to solve what should not be a very big problem.
Adherence to spec is the bedrock of this design. Stock USB 2.0 rated
cable applied in the recommended way should get you there. If not, then
a TDR can help find where the spec is violated, and that will be either
where the cable meets the connector, where the mating connector meets the
PCB traces, the traces themselves (most likely), or where the traces meet
the chip or passive components (next most likely). TDT should be used in
conjunction with TDR, because a cable with high attenuation can look good
on TDR, yet fail to deliver proper TDT waveforms. Is more than the spec
rated distance contemplated? Will these not be off-the-shelf cables? If
there is nothing special about this design, nothing above and beyond
recommended practices should be required for implementation.
Orin
On Thu, 07 Jun 2007 16:06:49 -0700 ronald miller <ron@xxxxxxxxxxx>
writes:
> Hi
>
> A two day task using a TDR(Tek), convert data to ADS and build a
> transmission line equivalent model
> in ADS which then can be used for simulating anything you want.
> The
> mdel can be converted to spice
> but the accuracy gets worse because frequency dependent factors are
> masked.
>
> Ron
>
> mukul pingley wrote:
>
> >Hi All,
> > I have below query, it would be greatly
> >appreciated if you can provide me with some info. on
> >this.
> > Is it possible to generate a model for USB? Is
> >there any the equivalent electrical model of USB cable
> >model for USB2.0 transceiver? If not,
> >is it possible to generate a model for USB cable for
> >stimulating standing wave phenonmena such as
> >reflected-wave effect, bounce back effect, propogation
> >delay, eye diagram and jitter in any spice simulator?
> >
> >Thanks,
> >Mukul
> >
> >
> >
> >
>
_________________________________________________________________________
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> --
> Ronald Miller
> Ghz Data, Signal Integrity Consulting
> 7721 Sunset Ave.
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> www.ghzdata.com
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