[SI-LIST] Re: Long trace open on the both ends
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Ravinder.Ajmani@xxxxxxxxxxxxxx" <Ravinder.Ajmani@xxxxxxxxxxxxxx>, "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 7 Jun 2006 07:31:59 -0700
Ravinder,
Don't worry about trace radiating. Hard to figure out who started the
rumor that traces running over planes are plausable sources of EMI, but it
is not so. Just leave the trace alone.
> [Original Message]
> From: <Ravinder.Ajmani@xxxxxxxxxxxxxx>
> To: SI-List <si-list@xxxxxxxxxxxxx>
> Date: 6/6/2006 1:50:02 PM
> Subject: [SI-LIST] Long trace open on the both ends
>
> Hi SI Experts,
> We have an existing design in which I have been asked to study the
> possibility of depopulating a part of the circuit (for cost reasons).
This
> will leave a trace about 6" long, open at both ends. The trace is part
of
> the analog circuit, and there are no high-speed signals near the trace.
My
> main concern is that since the trace is adjacent to the Power plane, it
> will pick up noise and then radiate it at its resonant frequency with
> unpredictable results. Even if I terminate it at the two ends, it may
> only alter the frequency of resonance. I would like to know:
>
> 1) Will there be any noise/EMI issue if I leave the trace as is.
> 2) What will happen if the trace is shielded, and
> 3) Will it help if I add pads for resistors to terminate the trace at
both
> ends.
> 4) Is there any possibility of simulating the trace behavior.
>
> I will really appreciate the feedback.
>
> Regards, Ravinder
> Server PCB Development
> Hitachi Global Storage Technologies
>
>
> Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
>
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