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Original question:

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RTOS/CC1310: When the RSSI is lower than -75dBm, the packet loss rate exceeds 90%?

user5001102
Prodigy 120 points
Part Number: CC1310

Tool/software: TI-RTOS

Hi：

      When testing our electronic price tag board (cc1310-433MHz-50kbps), the RSSI is -75dBm when the electronic ink screen is close to the board antenna. The packet loss rate is over 90%, and when the electronic ink screen is 20mm away from the board antenna. , RSSI can reach -90dBm.

       Question 1：

       1、The reason for the poor anti-interference of the matching circuit is that the RSSI performance of the electronic ink paper is lower than that of other manufacturers' RF chips when the electronic ink paper is close to the antenna.

       Question 2：

       2、Another RF chip A7129 has a performance:“IF Calibration Process”，Introduced in the data sheet can improve anti-interference。But  CC1310 does not have this。

      Thanks.

  • 0
    TI__Guru**** 317180 points
    1) From the description it sound like the antenna is detuned when you have the ink screen close to the antenna. Introducing something that is not RF neutral in the near field of an antenna will impact the resonance frequency of the antenna and hence the efficiency. This is independent of the RF chip and basic antenna performance.

    If we get more details on the product we can suggest how to place the antenna/ tune the antenna to get better performance.

    2) The part of the datasheet you posted had "confidential" on it indicating that it should not be shared on a public forum.
    Typically a receiver with non zero IF will have poorer blocking on the image frequency. By changing the IF on CC1310 it's possible to change which frequency the image is on.