[SI-LIST] Re: parallel plane strange results
- From: steve weir <weirsi@xxxxxxxxxx>
- To: ldieguez@xxxxxxxxxx,<si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Sep 2006 04:59:46 -0700
Leonard, the resonance amplitude and frequency are both distance
dependent. This is the real result of the distributed nature of
planes. Pull my DesignCon 2005 paper for actual measurements on a test board.
Regards,
Steve.
At 02:43 PM 9/20/2006, Leonard Dieguez wrote:
>I'm getting unexpected results. Can anyone give me some insight to what
>is going on?
>
>=20
>This same effect happens if there are ports there also.
>
>=20
>I am trying to simulate the voltages and impedance at different points
>and distances. I have a current source and 3 voltage probes attached to
>parallel planes. One is close by and the other 2 are farther away. The
>closest is V1 it has a resonance point in blue and is the lowest
>resonance. The other two seem to have a resonance higher in frequency.
>That is the question. The parallel plates have a constant capacitance so
>that does not change. The higher resonance points would point to less
>inductance and the curves would point to that also. My question is: is
>that true and why? And how? I would think that the inductance is higher
>since there is a farther distance.=20
>
>=20
>Here is a link to the results and also the SIwave set up
>
>http://pg.photos.yahoo.com/ph/lifeatthesharpend/album?.dir=3D9044scd&.src=
>=3D
>ph&store=3D&prodid=3D&.done=3Dhttp%3a//pg.photos.yahoo.com/ph/lifeatthesh=
>arpen
>d/my_photos
>
>
>
>Leonard Dieguez
>HSIO group Altera
>
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