[SI-LIST] Re: SDD21 and SDD11
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 29 Nov 2011 19:36:17 -0800
You can have passable Sx21 and still crummy Sx11. That is fairly
common. You need to hunt down what is going on. It could be your
measurement, or it could be you have a real problem with SDD11.
Steve.
On 11/29/2011 7:13 PM, john lin wrote:
> Hi SI experts,
> Could you please help to comment about I have a good SDD21, insertion
> loss, but not a good SDD11, return loss?
> Shall low insertion loss have a low return loss?
> The total power shall include transmitted and reflected powers.
>
> From my recent S4P extraction for a differential pair about 3 inch in
> length, I can see
> SDD21 does meet spec. However, the SDD11 violates the spec, less than
> -10dB.
> will it be OK? Is the SDD21 our main concern?
>
> Thank you for your helps in advance.
>
> Best Regards,
> John
>
>
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--
Steve Weir
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