[SI-LIST] Re: Differential line Via - affecting common mode noise
- From: "Lakshmi Narayanan Sowrirajan, ERS-HCLTech" <lakshminarayanans@xxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Thu, 9 Jun 2011 16:58:08 +0530
Hi Steve,
Thanks for the reply, please find the details as below.
1) DRV---brkout---via---8inch routing-----via----conn---4inch
routing----termination (x_p,x_n)
2) DRV---brkout--- 8inch routing-----conn---4inch routing----termination
(x_p,x_n)
Signal is probed near termination and we see less common mode noise in case 1,
where we have via (modeled in HFSS as s4p)
Common mode noise = (v(x_p)+V(x_n))/2
Thanks & Regards
Lakshminarayanan. S
9840250902
-----Original Message-----
From: steve weir [mailto:weirsi@xxxxxxxxxx]
Sent: Thursday, June 09, 2011 4:32 PM
To: Lakshmi Narayanan Sowrirajan, ERS-HCLTech
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Differential line Via - affecting common mode noise
Where and how are you measuring your CM noise? Virtually all vias
impose insertion loss. Non-transparent vias insert reactive
discontinuities.
Steve
On 6/8/2011 11:49 PM, Lakshmi Narayanan Sowrirajan, ERS-HCLTech wrote:
> Hi Experts,
> How the via improve or degrade the differential lines common
> mode noise and performance as I am getting more common mode noise for a case
> where I don't have any via. If I include a transition via (modeled in HFSS -
> s4p model) the common mode noise is getting reduced. Please direct me to a
> good article/paper/book to understand the theory behind this.
>
> Thanks& Regards
> Lakshminarayanan. S
>
>
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Steve Weir
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