[SI-LIST] Power plane resonace for multi-plane issues
- From: =?big5?b?Sm9obiBMaW4gKKpMtMK31yk=?= <John@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 2 Jun 2004 14:15:02 +0800
Dear all SI gurus,
one question regarding Power plane resonance.
Currently, I use SpeedXP from Sigrity for simulating power plane resonance.
The set up is that
TOP layer : VCCP ----- on top layer,
2nd layer : GND, VCC3_3 -- partially overlap both plane on
the second layer
3rd layer : GND
....
BOT layer: VCCP -- on bottom layer
I inject a current pulse into VCCP at a node on the top layer. With Fourier
transfer for voltage and current, and got a plot of plane impedance. My VNA
measurement shows a resonance at 50 Mhz, but the simulation show 100Mhz.
I think the mismatch may be among , VCCP,VCC3_3, and GND plane . Shall I let
VCC3_3 plane float or tie it to somewhere?
I know Cadence's PI tool need to specified each overlapping plane pairs with
correct voltage difference for multi-plane issues.
I don't know how to take care current injection issues on Sigrity SpeedXP for
multi-planes.
Does somebody please kindly shed some light on it.
Thanks,
John
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