Re: [SI-LIST] : Decoupling caps and power plane effects

Raghu (raghu@apsimtech.com)
Tue, 18 May 1999 17:07:02 -0700

Dear Jay,

Your explanation is quite accurate. As you have said, you can get a very large
number of partial elements (mainly, L,R, mutual impedance) from a plane. You do
not really need to know a lot about network analysis to formulate equations to
solve this. You could just write mesh equations around all the meshes you
produce.

The main problem is in solving these equations. You get a very large number of
equations. Ideally all meshes are coupled to each other and you have a full
matrix. In order to solve these in reasonable time even for relatively small
geometries, you have to use special techniques.

A couple of references apart from Ruehli's classic paper are

1. T. S. Smith and C. R. Paul, Effect of grid spacing on the inductance of
ground grids, Proc. IEEE EMC Symposium, pp 72-77, Aug. 1991

2. R Raghuram, Z. Yang, Dileep Divekar, and Paul Wang, Inductance Computation of
Multiple Arbitrarily Shaped Planes, EPEP, pp 215-218, Nov. 1994,

Warm regards.

-- 

************************************************************************ Raj Raghuram Applied Simulation Technology 1641 N. First Street, Suite 170 San Jose, CA-95112. Tel: (408) 436-9070 ext.101 Fax: (408) 436-9078 e-mail: raghu@apsimtech.com ************************************************************************

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