[SI-LIST] Re: Methods to reduce SDD11
- From: Chockalingam Selvaraj <chockalingam.s@xxxxxxx>
- To: "istvan.novak@xxxxxxxxxxx" <istvan.novak@xxxxxxxxxxx>, "sij99@xxxxxxxxx" <sij99@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Sat, 18 Jan 2014 14:13:46 +0000
Hi Jack, Run a TDR (simulate or measure) and check for discontinuity location.
Hunt down those discontinuities as Steve pointed out!
Regards
Ck.,
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Istvan Novak
Sent: Saturday, January 18, 2014 7:25 PM
To: sij99@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Methods to reduce SDD11
Jack,
How did you do the evaluation? Was it simulated or was it measured or both?
Regards,
Istvan Novak
Oracle
On 1/18/2014 6:06 AM, Jack Si wrote:
> Hi Experts,
> When i evaluate a Differential S-parameter of a 100 ohm differential trace (4
> mil trace width and spacing of 6.35mils) which travels through microstrip
> length of 50 mils and stripline of 2500 mils with two vias without any stub,
> I found that the the value of SDD11 is more than the expected at the
> frequency of 5 GHz (around -10 dB). The differential via is of 8 mil drill
> and 20 mils pad with the spacing between the via is 25 mils. The impedance of
> single via is has the impedance of 49ohm.
>
> Please suggest the method to reduce SDD11.
>
> Thanks,
>
> Jack
>
>
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