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CC2640R2F: why dose Too much IQ amplitude change in the same palce?

zhang huijun
Prodigy 200 points
Part Number: CC2640R2F


the sdk is simplelink_cc2640r2_sdk_2_30_00_28. When RSSI is greater  than 70, the IQ amplitude is about 200;When RSSI is less than -70, the IQ amplitude is about 2000.how to slove this?

  • 0
    TI__Mastermind 25810 points

    Hey Zhang,

    Can you provide some context here? I want to make sure I have the right people help you with your question.

    Which project are you working with? Are you testing on custom hardware, or with launchpad dev kits?

  • 0 in reply to Ammar N
    Prodigy 200 points

    the sdk is simplelink_cc2640r2_sdk_2_30_00_28, the example aoa-receiver and aoa-sender(in raw iq mode). the antena board is our own hadware,

  • 0 in reply to zhang huijun
    TI__Mastermind 25810 points

    Thanks Zhang for providing that context. I've assigned our AoA expert to help you further.

  • 0 in reply to Ammar N
    TI__Guru** 101460 points

    Hi,

    First of all let me remind you that TI has made the decision to discontinue further development and support of the TI-proprietary Angle of Arrival (AoA) on the CC2640R2. We recommend and welcome our customers using AoA on CC2640R2 to transition from the CC2640R2 to the new RTLS examples based on the Bluetooth 5.1 specification which can be used with the CC13x2R and CC26x2R devices. These software examples can be found in the SimpleLink™ CC13x2 and CC26x2 software development kit 3.40 or later which features a Bluetooth 5.1 qualified stack with support of Bluetooth 5.1 Angle of Arrival. To make this transition, here is a list of available resources you can reference: Simple Link Academy, AoA stack users guide, LaunchPad Tool Order Page

    That being said, the behavior you are seeing is expected. This is due to the AGC which has not a fixed gain (the AGC gain is increased when the RSSI is smaller). One solution could be to disable the AGC (i.e. set a fixed gain). But we do not recommend altering the AGC as this will invalidate the receiver performance numbers from the data sheet. It will also cause to lose either radio sensitivity (range) in the case of locking the gain low, or you will oversaturate the antenna very easily (if devices are too close) in the case of locking it high.
    In other words, I suggest to accept this difference in the AGC gain and develop the algorithms based on that.

    Regards,

  • 0 in reply to Clément
    Prodigy 200 points

    for connectionless ble aoa ,CC26x2R and CC13x2R don't surpport ,they only connected ble aoa。how to set the AGC gain?(in datasheet we don't find related register)。we nedd test "Whether different AGC bring different propagation delays"

  • 0 in reply to zhang huijun
    TI__Guru** 101460 points

    Hi,

    Here is a thread dealing with AGC setting.

    Best regards,