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Tool/software:
Hi Team,
we are facing issue at frequency of 13.56MHz in our design during conducted emission test as per CISPR 25. It is crossing the limit by more than 15dB.
Can you pls help to know its root cause and also help to optimize this one.?
I have attached schematic as well as CE graph as well. Please help to debug this.
Best Regards
Sumit Ranjan
Hi Smit,
I don't have the expertise to analyze your specific system having noise level over the limit specified by CISPR 25. I can only say that by following the recommended antenna and layout design guideline the the DLP-7970ABP has the CE/DoC Reports.
Here is a app note for best practice antenna design. https://www.ti.com/lit/pdf/sloa241
Here is an app note for layout design guidance. https://www.ti.com/lit/pdf/sloa139
This below answered by Ralph may be also a good read.
Hi Texas team,
Thanks for sharing this data. I have followed this one.
Can you pls help to know what is this resistor value here? What is the role of this?
Hi,
I think it is for Antenna Tuning. You can find the sample schematic in the datasheet. The resistor is 680ohm as shown.