[SI-LIST] Re: TDR and S-parameter
- From: bala <balaseven@xxxxxxxxx>
- To: Feng Wu <wufengthu@xxxxxxxxx>
- Date: Mon, 30 Sep 2013 18:25:31 +0530
Hi Feng,
20 Ghz is the bandwidth, 100ps is the rise time of the pulse.No,I didnt see
big return loss.
--bala
On 30 Sep 2013 06:49, "Feng Wu" <wufengthu@xxxxxxxxx> wrote:
>
> Hi Bala
> Would you please clarify what the S parameter bandwidth is? do you see big
> return loss?
> About the 100ps pulse in TDR measurement, do you refers to square pulse
> with 100ps rising time or pulse width 100ps?
> Do you enable the peeling off algorithm for both case?
>
>
> B.R.
> Feng Wu (å´æ«)
> -------------
> Signal Integrity Engineer
> Cisco Shanghai
> -------------
>
> 2013/9/30 bala <balaseven@xxxxxxxxx>
>
>> Hi Experts,
>> I am validating one high speed interface for my new design.I just wanted
>> to
>> ensure differential impedance of my IC package+PCB interconnect+backplane
>> connectors are in 90-110 ohm range.
>> My connector vendor shared their s-parameter model and their TDR
>> report.Their plot shows 85-102 ohm variation.They just applied 100 ps
>> square pulse and generated their TDR plot, whereas in my tool i generated
>> TDR directly from S-parameter(no pulse applied,this tool has this
>> option),and my plot shows different result(95-103 ohm).I am just checking
>> with my vendors on this.My question is,no vendor always share their report
>> along with their model.Many of us would have decided their channel's TDR
>> is
>> good as it shows 95-103.But actually different tool has different method
>> to
>> generate TDR and shows different plot,like my vendors' report and my
>> report.So if someone provide their model without their own correlation
>> report,how do we believe our results are correct?
>> --
>> bala
>>
>>
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>
>
> --
>
>
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