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 > > > > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > ------------------------------- > This e-mail is for the sole use of the intended recipient and may > contain confidential and privileged information. Any unauthorized > review, use or disclosure is strictly prohibited. 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