[SI-LIST] Re: Methods to reduce SDD11
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 18 Jan 2014 05:53:06 -0800
Hunt down your discontinuities.
Steve.
On 1/18/2014 3:06 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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