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EMI issue of BF537

Question asked by ray.sun Employee on Apr 1, 2014
Latest reply on May 21, 2014 by Suraj

Hi there,

 

I would like post a EMI issue from a system with BF537 as main processor.

 

From the EMI test report, you can see there are some obvious spur over the mask. I want to find the reason where it is from? Are they related with DSP itself?

EMC_TEST1.jpg

 

Below are more information about this system:

fCCLK=150MHz, fSCLK=75MHz

SPORT was disabled by SPORTx_TCR1, TSPEN bit, the rate is 750KHz

Four layers, there are chips and signals; GND;3.3V;signals. No seperate layer for 1.2V

There is a flexible cable from this system to another one, I have added 33 ohm (besides BF537) into some signal lines ,which are across the two boards.

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