CC2340R5: CC2340R5 PER test harmonic issue

Hi,

This looks typical to me. Are you accounting for the cable loss in the measurements?

Also, can you do the same with SmartRF studio?

Thanks

Hi FI,

Are you accounting for the cable loss in the measurements?

>>I calibrate 2402, 2440 and 2480 MHz so there is no issue about cable loss.

can you do the same with SmartRF studio?

>>OK, there is result with SmartRF studio.

There is another project output power sweep, FYR.

Hi FI,

Are you accounting for the cable loss in the measurements?

>>I calibrate 2402, 2440 and 2480 MHz so there is no issue about cable loss.

can you do the same with SmartRF studio?

>>OK, there is result with SmartRF studio.

There is another project output power sweep, FYR.

Hi Fl,

Because my project 108F has a big gap in output power, does TI have any file to calibrate output power?

Besides that, there is also a gap in PER test result. Does TI have any idea about it?

Hi FI,

Is any update here? Could we use calibration file to fix it? I think this is an issue that needs to be solved.

Thanks.

Hi,

Can we review the schematic and layout of your design?

Thanks

Hi FI,

Attachment is layout review profile. Because EVB also has power level gap, I think it is not related to layout. This is an issue that needs to be solved.

Thanks.

Wistron-Schematic-Layout-2023-08-24.pdf

Hi,

Thanks for the feedback. I will discuss this with the validation team and get back to you soon.

Regards

HI FI,

I've been troubled by this problem for a long time.I hope there is a solution ASAP.

Thanks.

Hi Fu, It seems your project 108F is not the one that was reviewed by TI, right? With the offset you are seeing on output power, and more importantly the PER results, I would assume that you have some problems with the layout of the RF network or/and the decoupling and GND routing. I you want to post images of your design here I can take a look. 

Hi fredrikgk,

You are right. We find some issue about power plane coulping and fix this issue in next version. I think we should focus on 112F and EVB performance. Does TI replicate this phenomenon in your lab?

Thanks.

HI FI and fredrikgk,

Are there any updates? Does TI replicate this phenomenon in your side?

Thanks.

Both of your observations are normal. The output power is not perfect and will vary a bit from device to device. You will see some emission from the chip even in Rx since the frequency generating circuitry inside the chip must be running to receive data. 

HI fredrikgk,

Thanks for your reply. Is there any calibration file that can solve this problem?

It is not a problem. You will not notice this in actual use. 

HI fredrikgk,

If there is a gap between setting and power we actually get, how should I provide power table? If I want to a get 2 dBm output, I should use 3 dBm power setting? It does't make sense.

Thanks.