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July 1997

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Subject:
Re: Via Inductance
From:
[log in to unmask] (Doug McKean)
Date:
Thu, 31 Jul 1997 13:05:07 -0400
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Hi Jack, 

One question:  Analog or digital signals at 1.9 GHz? 

Regards,  Doug 

> From: Jack Olson <[log in to unmask]>
> To: [log in to unmask]
> Subject: DES: Via Inductance
> Date: Thursday, July 31, 1997 12:51 PM
> 
> I am a lowly board designer, and I have been asked to
> replace our standard via types (0.18 hole diameter) with
> vias that are twice as large (.036 holes) to reduce the
> inductance. I haven't seen any data to warrant a change 
> like this, so I was hoping:
> 
> Can anyone steer me towards finding out the inductance of
> vias at 1.9GHz based on their diameter?
> 
> Is anyone brave enough to hazard an opinion as to the REAL
> effect of vias on a 1.9GHz circuit? I should mention that 
> all signals are on one layer, the vias are ONLY for power 
> and ground access. 
> 
> confused but want to learn,                         Jack
> 
>
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