[SI-LIST] Re: PDN resonance mode excited by high speed signal
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: "sherman.chen@xxxxxxx" <sherman.chen@xxxxxxx>
- Date: Mon, 22 Dec 2014 13:39:53 -0500
Sherman
Given the difference in impedance of the PDN and the signal trace, you
might not see anything. But, if you place two signal traces and their
associated vias penetrating through the PDN, you should definitely see the
PDN peaking show up as crosstalk peaking. You are better off simulating
these sorts of things with a Frequency doman solver where you see the
richness of the spectrum. To get that with a time domain solver requires
that you use a very long run length PRBS pattern.
Scott
Scott McMorrow
Consultant - R&D
16 Stormy Brook Rd
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com
On Mon, Dec 22, 2014 at 1:20 PM, Chen, Sherman <sherman.chen@xxxxxxx> wrote:
> Hi experts,
> I'm trying to simulate the phenomena of PDN resonance mode getting excited
> by the EM field generated from high speed signal. Here is my modeling:
> 1. A 2''x4'' 6-layer PCB with the following stackup:
> TOP SIG
> PL02 GND
> PL03 PWR
> PL04 PWR
> PL05 GND
> BOT SIG
>
> 2. Route one trace from one end of the board to the other end passing
> through 4 via from TOP to BOT. the reason of inserting vias in the trace is
> that as of now most hybrid simulators if not all of them, neglect the
> coupling btw trace and plane. Meanwhile the coupling btw via and plane is
> much more significant and is accounted by the solvers (Thanks, Yuriy and
> Brad).
> 3. The excitation connected to one end of the trace is a pulse of 1V
> ampl, 20ps tr/tf, 1ns high time, and 3ns period. Also I hooked one 1V DC
> source btw the power and the ground planes though it may not be necessary.
> Both sources are located at one end of the board, and at the other ends two
> resistor of 1Ohm are placed as the loads to each source respectively.
> 4. I ran the transient sim then convert the resultant waveform of the
> voltage across PDN into freq. spectrum. But looks the none of the spectrum
> components meet any of the PDN resonance freq. I tried to lower the load to
> 0.01Ohm, still didn't see the excitation occurring.
> 5. The sim tool used is Cadence Speed2000.
>
> I will check my setup again tomorrow. Please advice if you see anything
> wrong in above. Thanks.
>
> Best Regards,
>
> Sherman Chen
> Signal Integrity
> EMC Global Hardware Engineering
> Tel: +86 21 60951100-3329
>
>
>
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