[SI-LIST] Re: Coupling Between Adjacent Capacitors
- From: Brian Rautio <brian@xxxxxxxxxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 12 Jul 2011 16:42:56 +0000
I agree with Rick, but want to point out that it's also a function of the
potential on the capacitors. If we imagine two parallel plate capacitors side
by side, with the planes of the plates co-linear, there is going to be
significantly more coupling between them in odd mode than even mode, and
conversely, even mode is more likely to couple with the rest of the circuit.
As far as the role orientation plays, it's no more complicated than e-fields
going from high potential to low potential. If you know the geometry and
potentials, the best position and orientation should be self evident. If you
only know the geometry, there's a number of electromagnetic simulators that can
plot e-field lines directly.
Brian
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Rick Collins
Sent: Tuesday, July 12, 2011 11:43 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Coupling Between Adjacent Capacitors
If capacitors were just simple plates separated by large air gaps,
the parasitic effects might be more noticeable, but any cap you buy
is either a series of plates with very small spacings like
multi-layer ceramic caps, or made of layers rolled up. The fringe
effects would be very small indeed and likely no more than the stray
capacitance of any components or traces on the board.
That said, I'm sure you can find some situations where this could be
significant. For example radial ceramic caps are just one layer and
not very thin if I remember correctly. I expect they might have a
significant fringe field. But I haven't used one of those in over 15 years.
Rick
At 11:22 AM 7/12/2011, Scuteri, Jeremy wrote:
>I have a question about coupling between adjacent capacitors and the
>sensitivity to their orientation. I have heard of turning inductors
>90degrees to avoid magnetic coupling, but I did not think such a
>thing applied to capacitors. Maybe there could be some coupling of
>the fringe field if the caps are very close to each other. Has
>anyone experienced a sensitivity to the orientation of capacitors?
>
>Thanks,
>Jeremy Scuteri
>
>
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