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CC8530: CC2592 + CC8530 External Radiation Interferences

Mauro Ferrari da Rocha Filho
Prodigy 10 points
Part Number: CC8530
Other Parts Discussed in Thread: CC2592, , CC2591, CC8531

Tool/software:

Hello IT team.

We have an application where we already use the CC2592 + CC8530 solution for audio communication between two devices in our EVC2000G2's product. As per link below.

www.intelbras.com/.../videoconferencia-4k-microfone-wireless-evc-2000-g2-microfone-a

Basically, in this product, the mmicrophone communicates to the Main Unit via 2.4GHz

We have already had some interference problems due to band pollution (which is natural), however, we would like to know if there is something that improves for (hardware and firmware) the quality of our product, in order to minimize the impacts for the end user, since it is very bad for audio communication to present loss of information.

As we are going to change the communication antennas between the two products, precisely to improve some design problems, we also want to take the opportunity to analyze other possible improvements for (firmware and hardware) and, if possible, understand if is there any specific tests to analyze the IC's capacity and improvements to theyer immunity to external radiation.

Both aim to minimize external interference with our product and completely remove the possibility of information loss.

Follow attached files shcm from both units for your review.

Thanks.

The diagram part of Microphone-A_receive_CC2591&CC8531.pdf


The diagram part of Main unit-2.4G-Main-RX.pdf

  • 0
    TI__Guru**** 207327 points

    Hello Mauro,

    The best software resource for mitigating interference is to optimize Adaptive Frequency Hopping.  This is covered in the TRM (Section 2.4.3) and SWRA487.  I recommend closely reviewing these resources to determine how to best tune the PurePath Wireless Configurator appropriately.

    I will notify a HW expert to assist with your schematic review.  You can also submit a request to SIMPLELINK-2-4GHZ-DESIGN-REVIEWS. 

    Regards,
    Ryan 

  • 0 in reply to Ryan Brown1
    TI__Guru**** 168994 points

    Olá Mauro,

    As Ryan mentioned, please submit your design to a design review at the link provided above. 

    A few considerations:

    From a hardware standpoint, the main aspect that a design review can show is how the design compares with typical RF and best practices mentioned in our application note SWRA640 and in the CC2592 transceiver datasheet. Also, the schematic diagram only tells part of the story - the PCB layout, especially around the transceiver, is critical for good radio performance. 

    As you know well, the design itself is only partially related to the main issue of interference - after all, the environment is very uncontrolled.

    So, in the aspects of testing, I would definitely perform conducted measurements in CW to be certain the expected output power is actually being delivered to the antenna. With this you can also verify if the filtering is effective in eliminating spurious and harmonics at the antenna feed. Antenna matching also mitigates these effects, and we recommend evaluating its matching including the higher harmonics (we typically go up to third)

    I am not sure if you have an anechoic chamber, but irradiated tests would be also useful in this scenario to evaluate the relative position of main -> remote units for a better gain. Something not always possible on a customer's premises but could be used as a guideline for installation of your systems.

    Hope this helps,

    Rafael

  • 0 in reply to Ryan Brown1
    Prodigy 10 points

    Dear Ryan. 

    Today I have submited a new request for SIMPLELINK-2-4GHZ-DESIGN- REVIEWS. Please, check ans thank you for your support.

  • 0 in reply to desouza
    Prodigy 10 points

    Hi deSouza

    Thank you for you reply and support.

    Just today I have submitted the layout for your review by sending an email. 

    About your considerarion -

    Yes, agree with you. fore sure Its very important to check the layout. About the good pratices mentioned on your application notes, we are checking. Thank you for your information.

    For the CW (Continuous Wave) test, we already perfomed some tests which proofs the better antenna gain and efficiency. Please, check our antennas specification and tests done. This is a compration btw ond antenna and new antenna.

    We have changed the antenna already because we found the old antenna was also a cause of ssues before.

    antennas information.rar 

    For your suggestion of doing a irradiated tests to evaluate the relative position of main -> remote units for a better gain. Thats a good idea. Do you have some suggestions of parameter or third part labs which can help us?

    Thank you.