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DS90UB913A/914A EMC problem with 25M external oscillator

Charles (KAT) Zhang
Intellectual 1605 points


Hi Experts,

My customer is using DS90UB913A/914A to transfer the video signal, and doing EMC CEI test, customer has used one 25M oscillator at 913A side, and the block diagram is as below.

With different length of cable, customer has different CEI test result, 1m and 3m cable test results are as below.

So my questions are as below, could you please help to answer them.

1.At 1m cable test result, Is the 75M failure frequency band caused by spread spectrum of 914A, because this is not like a signle point frequency.

2.Will the cable length influence the CEI test result? The cable material is the same.

Thank you for your support.

Charles Zhang