[SI-LIST] hyperlinx: plane noise Vs Z profile
- From: "martinos72" <oscar.martinelli@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 01 Aug 2012 09:14:00 -0000
Dear All,
Working with linesim I have designed a very simple pds that include a couple of
plane, a vrm, a C, and one IC PIN. Very easily I have extract the z profile up
to 100Mhz in the IC pin area.
Then I have tried to run the plane noise simulation after have applied a
sinusoidal stimulus to the IC pin.
My question is: why I am not able to get the same voltage noise value from the
two analisys?
Example:
1. From decoupling analisys at 20Mhz, Z=0.1 ohm if I=0.5A V ripple would be 50mV
2. From voltage noise tool giving to the IC pin a sinusoidal stimulus IMAX=0.5A
freq.=20Mhz the max ripple measured on the IC area is alway considerably
smaller =28 mV.
Many thanks
Oscar
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