RE: [SI-LIST] : May 9th Presentation: "Radiation from Edge Effec ts in Printe...

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From: sweir (weirsp@atdial.net)
Date: Tue May 09 2000 - 21:50:59 PDT


Chris, you are so demanding. You want a product that both passes and works!

At 03:32 PM 5/9/00 -0700, you wrote:
>yah, and you kill the clock also.
>
>-----Original Message-----
>From: sweir [mailto:weirsp@atdial.net]
>Sent: Tuesday, May 09, 2000 11:32 AM
>To: si-list@silab.eng.sun.com
>Subject: Re: [SI-LIST] : May 9th Presentation: "Radiation from Edge
>Effects in Printe...
>
>
>Didn't that open the circuit at the source and prevent the stub from
>radiating?
>At 09:08 AM 5/9/00 -0400, you wrote:
> > >
> > > Chris R.:
> > >
> > > One exemplary case I recently came across had a series-terminated clock
> > line
> > > that was immediately submerged to a stripline which went to a connector
>on
> > > the edge of a PCB. The optional card that would use the connector was
>NOT
> > > installed. The connector receptacle pin rose above the PCB about 3/16
> > inch.
> > > This small 3/16-inch stub coupled harmonic energy to the SURFACE of the
> > PCB
> > > (a ground plane) at the SURFACE resonant frequency of the PCB. Surface
> > > currents could be measured all over the surface ground plane (with a
>small
> > > Fischer Communications probe). NASTY radiation resulted.
> > >
> > > Simple removal of the series termination resistor at the clock driver
>end
> > > reduced system radiation over 30 dB.
> >-----------------------------------------
> >How do you explain this significant reduction in emission levels by
> >the simple removal of the series termination resistor?
> >-----------------------------------------
> >
> > > Mike
> > >
> > > Michael L. Conn
> > > Owner/Principal Consultant
> > > Mikon Consulting
> > >
> > > *** Serving Your Needs with Technical Excellence ***
> > >
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