[SI-LIST] Re: VIA L and C values.
- From: "Baranauskas, Dave" <Dave.Baranauskas@xxxxxxxxxxxx>
- To: <aumesh@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 5 Mar 2002 23:15:57 -0600
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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