[SI-LIST] Re: Emc_FTT
- From: steve weir <weirsi@xxxxxxxxxx>
- To: ramesh.k@xxxxxxxxxxx,<si-list@xxxxxxxxxxxxx>
- Date: Wed, 13 Sep 2006 20:33:47 -0700
Storing a spark in a high Q network is a good way to cook your
parts. Why aren't you using a transient suppression device?
Steve.
At 08:05 PM 9/13/2006, RameshK Cozerv IN HO wrote:
> Hi Istvan,
>
>You got that right,I need to slow a fast edge with a via inductance,since
>iam pcb designer,I posted my query in the forum hoping to get good responses
>to start with.
>
>I did not understand the length of the via you were talking about,can you
>please explain in details on the same.
>Noise is coupled only after 7kv from digital input side to the secondary
>side of the opto(eft test),now I need to know the exact no of vias with
>sizes to suppress the noise in the primary side itself.Matter of fact, iam
>also inserting inductors too in the prototype board and other with the vias
>to experiment and see the result.Suggestions and advices are appreciated.
>
> -Ramesh
>
>
>
>-----Original Message-----
>From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxx]
>Sent: Wednesday, September 13, 2006 5:53 PM
>To: ramesh.k@xxxxxxxxxxx
>Cc: si-list@xxxxxxxxxxxxx
>Subject: Re: [SI-LIST] Emc_FTT
>
>Ramesh,
>
>I assume you want to slow a fast edge with via inductance. The pad size has
>very little effect. Drill size has also just a small impact. The biggest
>impact is the actual length of via used in series to the signal between the
>entry and exit traces. Next biggest contributor is the distance to the
>nearest return via.
>With a 2-3mm long via path you may get up to a nanohenry inductance, so
>achieving 10-20nH may require a series a vias.
>
>Regards,
>
>Istvan Novak
>SUN Microsystems
>
>RameshK Cozerv IN HO wrote:
>
> >
> >Hi Folks,
> >
> >Can someone guide me,what will be the via size(Drill & Pad Size) to
> >accomplish 10 to 20 nano henry drop for 5 ns rise and fall in fast
> >transient time (Emc)?
> >
> >suggestions and advices are appreciated.
> >
> >-Ramesh
> >
> >
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