FreeLists / si-list / [SI-LIST] Re: SSO pushout

[Himanshu Arora <ha324005@xxxxxxxxx>]

Mahajan,

Going as per your explaination it looks to me that
differential signalling will increase the mutual
capacitance ( which will try to slow the signal ) but
decrease the inductance ( due to reduced loop area)
hence improving delay performance. Is this OK?

Sincerely

Himanshu Arora


--- Abhijit Mahajan <amahajan@xxxxxxxxxxxx> wrote:
> 
> One way to explain this is as follows:
> 
> The mutual capacitance between the lines doubles
> when the neighbouring
> outputs switch
> in a direction opposite to the victim line.  This
> means that the signal
> on the victim line now
> takes longer to rise due to the added capacitance
> hence increasing the
> delay.
> 
> 
> 
> 
> 
> Lin Wee wrote:
> 
> > Hello:
> >
> > I was reading some SI paper that says:
> >
> > " SSO pushout is a result of multiple drivers
> > switching simultaneously. It impacts signal
> integrity
> > through adding extra delay to the propagating
> signal"
> >
> > I understand that we'll have more current in the
> > return path due to simultaneous switching that may
> > cause ground/plane bounce, but couldn't relate
> that to
> > delay.
> >
> > Can someone explain this  delay, as the text
> doesn't
> > explain that ?
> >
> > Thanks;
> > -Lin
> >
> > __________________________________________________
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