[SI-LIST] Re: Multiple power planes coupling to ground
- From: wjcsongr@xxxxxxxxxxxxxxxxxxx
- To: V S <for_si2003@xxxxxxxxx>
- Date: Mon, 22 Sep 2008 11:41:20 -0500
I could live with this with sufficient decoupling caps. You may consider
some of that spiffy thin dielectric material between your powers and
grounds for more intrinsic capacitance.
Regards,
Bill
William Csongradi
Senior Electrical Engineer
Rockwell Collins Heads Down Display Center
319-295-7884
Mailing Address
Rockwell Collins
400 Collins Road NE
MS 105-167
Cedar Rapids, Iowa 52498-0001
V S <for_si2003@xxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
09/22/2008 11:23 AM
To
si-list@xxxxxxxxxxxxx, Joseph Pankow <jhpankow@xxxxxxxxx>
cc
Subject
[SI-LIST] Re: Multiple power planes coupling to ground
I was just wondering if the plane stack
VCC1
|
GND
|
VCC2
|
GND
|
VCC3
could be a better alternative. But we can not be sure unless we know what
signals are above and below these power layers.
Vikas Shukla
http://referencedesigner.com
--- On Mon, 9/22/08, Joseph Pankow <jhpankow@xxxxxxxxx> wrote:
> From: Joseph Pankow <jhpankow@xxxxxxxxx>
> Subject: [SI-LIST] Multiple power planes coupling to ground
> To: si-list@xxxxxxxxxxxxx
> Date: Monday, September 22, 2008, 12:40 AM
> Hello all,
> If you have multiple power planes sandwiched between 2
> ground planes -
> somewhere in your stackup - next to each other like so:
>
> |
> GND
> |
> VCC1
> |
> VCC2
> |
> VCC3
> |
> GND
> |
>
> From a high-frequency noise filtering/decoupling
> standpoint, VCC1 and VCC3
> have relatively good capacitive coupling to ground, but
> what about VCC2?
>
> I understand that there will be capacitive coupling between
> VCC2 and the
> other planes, but does this still give me a reasonably good
> filtering scheme
> for VCC2 at high frequency? Or does it just couple VCC2
> noise onto my other
> power planes?
>
> I'm trying to visualize the loop currents to ground
> when devices draw power
> from VCC2. Will the VCC2 power noise will couple directly
> through the other
> power planes to ground, or will the other power planes will
> act like shields
> so that VCC2 no longer has good low-inductance filtering
> for high frequency
> noise?
>
> Any insight would be appreciated.
>
> Thanks,
> Joseph
>
>
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