[SI-LIST] Re: SSN

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Fri, 21 Oct 2011 19:39:14 -0700

Current through any common impedance directly couples into all signals 
that share that impedance.

Steve.
On 10/21/2011 7:18 PM, elie issa wrote:
> Could you also elaborate on how ground bounce impacts
> crosstalk?
>
> Thank you
> Elie
> From: steve weir<weirsi@xxxxxxxxxx>
> To: si-list@xxxxxxxxxxxxx
> Sent: Friday, October 21, 2011 3:39:38 PM
> Subject: [SI-LIST] Re: SSN
>
> SSN will ultimate limit, but only after it has done great damage to
> signal integrity.  You can demonstrate the idea by getting out an octal
> or wider driver and wiring all the inputs to the same pulse source, and
> all the outputs to 50 Ohm loads.  Measure the waveforms with tight
> bypass right at the package, and then inserting your soon to be not so
> favorite ferrite bead between the bypass and the package Vdd pin.  If
> you don't have a favorite bead, one that is called out in many app notes
> is a TDK MPZ1608S221A.
>
> Then you can repeat the experiment by driving one of the inputs with an
> out of phase signal.
>
> Steve.
>
> On 10/21/2011 9:12 AM, elie issa wrote:
>> It looks like my second line got clipped:
>> We know that SSN saturates after switching a certain number of outputs, 
>> based on the relation N*L*di/dt, and
>> starts a reverse process,..
>>   
>> From: elie issa<eliaissa1@xxxxxxxxx>
>> To: "si-list@xxxxxxxxxxxxx"<si-list@xxxxxxxxxxxxx>
>> Sent: Friday, October 21, 2011 11:50:37 AM
>> Subject: SSN
>>
>>
>> I'd like tp propose this topic:
>> we know that SSN staurates after switching a certain number of outputs, and 
>> start
>> could someone elaborate on the reasoning behind the saturation, and  are 
>> there
>> designed applications taking advantage of this aspect of it out there
>> Also, system crosstalk worsen because of package parameters, so beside 
>> crosstalk at package level, ssn
>> also contribute to crosstalk,  could some explain what happens there?
>>
>> Thank you
>> Elie
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>


-- 
Steve Weir
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