[SI-LIST] Re: Resonance in traces?
- From: "Antonis Orphanou" <orphanou@xxxxxxxxxxxx>
- To: "aaditya.kandibanda@xxxxxxxxx" <aaditya.kandibanda@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Sat, 10 Mar 2012 00:29:58 +0000
A resonance in reality means standing wave, which consist of a forward and
backward traveling waves, interfering in such a way that the energy does not
actually propagate through the structure but rather dissipates locally along
it. The frequency of this resonance directly relates to the electrical length
of the particular structure. Any pcb trace has a set of modes associated with
it and you can view any waveform along that traces as a weighted linear
combination of all these modes (you may have also known these are the
eigenmodes of the source free solution to your geometry. They are multiples of
half wavelength).
Along a pcb trace we have numerous discontinuities (vias, connectors...etc) and
each one of them will contribute a resonance based on their mutual distance.
The higher the discontinuity the stronger its manifestation on your insertion
and return losses.
Another set of structures, like a trace and a via stub have a slightly
different concept of resonance (quarter wavelength) which is the transition
from capacitive to inductive input impedance.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Aaditya Kandibanda
Sent: Friday, March 09, 2012 4:10 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Resonance in traces?
Hello everyone,
I am not able to understand the concept of resonance in PCB traces. is this
resonance caused because of inductive coupling with other traces or is its
cause is reflected signal on same trace? what happens to signal on trace at
resonance?
Thanks and regards
Aaditya
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