[SI-LIST] WG: AW: Re: Methods to reduce SDD11
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 21 Jan 2014 10:56:50 +0000
resent
Von: Havermann, Gert
Gesendet: Dienstag, 21. Januar 2014 11:54
An: 'Jack Si'; si-list@xxxxxxxxxxxxx
Betreff: AW: [SI-LIST] AW: Re: Methods to reduce SDD11
Without GND vias it is no wonder that you see bad return loss. Switching layers
without GND connection is just like crossing a split plane. You have to assure
a current return path close to the signal via to allow return currents to
switch layer.
Simply begin with two vias in a GSG configuration perpendicular to the signal
trace. Then simulate different via distance until the S11 is good enough to
suit your application.
BR
Gert
Von: Jack Si [mailto:sij99@xxxxxxxxx]
Gesendet: Dienstag, 21. Januar 2014 11:31
An: Havermann, Gert; si-list@xxxxxxxxxxxxx
Betreff: Re: [SI-LIST] AW: Re: Methods to reduce SDD11
Hi Gert,
I have not placed any GND via around. Please suggest the method to calculate
the impedance of Differential via with GND via spacing, GND via size etc.,
Thanks,
Jack
On Tuesday, January 21, 2014 2:04 PM, "Havermann, Gert"
<Gert.Havermann@xxxxxxxxxxx> wrote:
How many GND vias are placed how close the signal via?
BR
Gert
----------------------------------------
Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp;
Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808;
Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning,
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----------------------------------------
Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp;
Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808;
Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning,
Dipl.-Ing. Torsten Ratzmann, Dipl.-Wirtschaftsing. Ralf Martin Klein
-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Jack Si
Gesendet: Dienstag, 21. Januar 2014 04:06
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Methods to reduce SDD11
Hi Feng Wu,
I am doing the comparison of TDR and Frequency Domain Analysis. Can you suggest
for any Calculation method based on literature for an approximate correlation.
Hi Lyn Wang,
I am using a Blind via from Top to Layer 3. This differential signal is routed
in Layer 3, So there is no way for the stub. There are some dips at 2GHz,
4.2GHz and the SD11 reach the peak at 5GHz and 6.2GHz respectively.
Thanks,
Jack
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