[SI-LIST] Re: Return current of a trace in stripline

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Sun, 04 Aug 2013 11:57:47 -0700

Yes, you should be very concerned. "More" and "less" do not mean "all" 
and "none".

Steve

On 8/4/2013 11:42 AM, Balaji G wrote:
> 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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