[SI-LIST] Re: Return current of a trace in stripline
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Antonis Orphanou <orphanou@xxxxxxxxxxxx>
- Date: Mon, 5 Aug 2013 14:36:45 -0400
To follow on, the displacement current will launch a cavity wave between
the planes. If there is a natural resonant frequency in the cavity (and
there always is) the wave will be reinforced, thereby causing noise and
crosstalk amplification.
On Mon, Aug 5, 2013 at 2:12 PM, Antonis Orphanou <orphanou@xxxxxxxxxxxx>wrote:
> The ground will be continuous anyways. If there is not a continuous
> conductive path to complete it then it will continue through voltage
> gradients as a displacement current.
>
> Thanks
> Antonis.
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Balaji G
> Sent: Sunday, August 04, 2013 11:43 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Return current of a trace in stripline
>
> Hi Experts,
> We discussed a lot regarding path of return current before and this is
> regarding the path of return current in a stripline trace. As far I learnt,
> the return current will take the path of least resistance at low
> frequencies and path of less inductance at high frequency and hence the
> reason that return current travels in the plane directly under the signal's
> trace. My question is if we consider a signal travelling in a stripline
> which is sandwiched between the ground and split power plane where the
> signal to ground distance is 3.7mils and signal to split power plane
> distance is 4.3mils, should we worry about the split power plane at high
> frequency (say 3GHz) as the signal to ground distance is the path of least
> inductance and all the return current for high frequency signal trace flows
> in the ground plane causing no reflection/ EMI issues? Is my thinking
> right? Can you please provide your thoughts on this?
>
> Regards,
>
> Balaji
>
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--
Scott McMorrow
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