[SI-LIST] : Re: [SI-LIST] Re: [SI-LIST] May 9th Presentation: "Radiation from Edge Effects in Printe...

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From: Charles R. Patton (charles.r.patton@ieee.org)
Date: Wed May 17 2000 - 13:34:35 PDT


Mike,
You said : This small 3/16-inch stub coupled harmonic energy to the
SURFACE of the PCB

Then said: Simple removal of the series termination resistor at the
clock driver end reduced system radiation over 30 dB.

I don't understand. I would have concluded that the resistor
body/mounting pads had formed a loop coupling into the surface, or were
directly radiating. Removal of the series termination resistor would
have lowered the driver impedance, effectively raising the harmonic
content in the line to the stub pin thereby effecting an even higher
radiated power if the stub pin were the radiator.

Regards,
Charles R. Patton, Owner
Synergy Co.
Creative, Cost Effective EMI, ESD and Analog Design Solutions=94
21490 Camino Arriba
Murrieta, CA 92562
Phone: 909-698-9657
Fax: 909-698-0224
Email: charles.r.patton@ieee.org

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