[SI-LIST] Re: VIA L and C values.

  • From: Umesha <aumesh@xxxxxxxxxxxxxx>
  • To: Pat Diao <Pat_Diao@xxxxxxxx>
  • Date: Thu, 7 Mar 2002 13:01:49 +0500 (GMT+0500)

Thanks for your reply.

You have  mentioned Dr. Johnson's
book and Hall, Hall and Mcalls Book .

 I feel the formula given there is
for a single plane and the value calculated is on
the higher side. In my case I have 6 planes.

 Any further inputs are appreciated.

Regards,
Umesha




   aumesh@xxxxxxxxxxxxxx 
   aumesh@xxxxxxxxxxxx
   kamath_u@xxxxxxxxxx
   kamath.u@xxxxxxxxx

Umesha
Centre For Development Of Telematics
Sneha Complex, 71/1, Miller Road,
Bangalore 560052. Phone:91-80-2263399 extn 239/279
Fax: 91-80-2263256


On Wed, 6 Mar 2002, Pat Diao wrote:

> 
> Also you can check "High-speed Digital System Design", Hall, Hall, and
> McCall (Ch. 5) for via C and L.
> 
> Pat
> 
> 
> Pat Diao, Ph.D.
> ASAT Inc.
> Fremont, CA
> pat_diao@xxxxxxxx
> 
> -----Original Message-----
> From: Baranauskas, Dave [mailto:Dave.Baranauskas@xxxxxxxxxxxx]
> Sent: Tuesday, March 05, 2002 9:16 PM
> To: aumesh@xxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: VIA L and C values. 
> 
> 
> 
> Umesha,
> 
> You may want to check out Dr. Howard Johnson's book "Digital Design --
> The Hand Book of Black Magic" (the title may not be exactly as I have
> stated, but you can search on his name and get to his web-site).  He
> gives some quick and dirty calculations for LC parameters for a via
> based on geometries.
> 
> Dave
> 
> -----Original Message-----
> From: Umesha [mailto:aumesh@xxxxxxxxxxxxxx] 
> Sent: Tuesday, March 05, 2002 10:20 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] VIA L and C values. 
> 
> 
> 
> Hello Experts,
> 
>  I am simulating a 50 Mhz point to multipoint bus.   I am  using the
> following stackup for the board. Board is with 6 planes and  8 signal
> layers.  
> 
> And I am using vias of dimension
> 12/25/35 and 10/20/32  (drill/pad/antipad) respectively. Can any one
> tell
> the L and C values for these vias.
> 
> The inner signal layers donot have any pads except where they
> connect to that signal layer. 
> 
>        
> s1          --------------------------    0.5 Oz
>                                                       5 mil      
> S2          --------------------------    0.5 Oz
>                                                       6  mil
> ref         XXXXXXXXXXXXXXXXXXXXXXXXXXX   0.5 Oz
>                                                      7 mil
>       
> s3         ----------------------------   0.5 Oz
> 
>                                                      10  mil
> s4         ----------------------------   0.5 Oz
>                                                       7 mil
> 
> ref        XXXXXXXXXXXXXXXXXXXXXXXXXXXX   1 Oz
>                                                      4  mil
> 
> ref        VVVVVVVVVVVVVVVVVVVVVVVVVVVV   1 Oz
>                                                      5  mil
>  
> ref        VVVVVVVVVVVVVVVVVVVVVVVVVVV    1 Oz
>                                                      4  mil
> 
> ref        XXXXXXXXXXXXXXXXXXXXXXXXXXX    1 Oz
> 
>                                                      7 mil
> s5         ----------------------------   0.5 Oz
>                                                      10 mil
> s6         ----------------------------   0.5 Oz
>                                                      7 mil
> ref       xxxxxxxxxxxxxxxxxxxxxxxxxxxx    0.5 Oz
>                                                      6  mil
> s7         -----------------------------  0.5 Oz
>                                                      5  mil
> s8         ------------------------------  0.5 Oz
> 
> 
> where ----------------------  signal layer
> 
>       XXXXXXXXXXXXXXXXXXXXXXXX Ground layer
> 
>       VVVVVVVVVVVVVVVVVVVVVVV  VCC layer
> 
> Could somebody please tell me what would be the via 
> capacitance and inductance. Or could somebody tell
> me what is the capacitance for  similar vias or
> buildups close to the above. I donot have access to
> field solvers nor am in a position to measure them
> Infact I am not quite certain how to measure them.
> 
> Thanks for any help.
> 
> 
> Regards
> 
> Umesha
> Centre For Development Of Telematics
> Sneha Complex, 71/1, Miller Road,
> Bangalore 560052. Phone:91-80-2263399 extn 239/279
> Fax: 91-80-2263256
> 
> 
> 
> 
> 
> 
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