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Original question:

RTOS: CC2640: AoA algorithm Limitations

RTOS/CC2640R2F: CC2640: AoA IQ sample rate

Stanford Li
Intellectual 1000 points

Part Number: CC2640R2F

Tool/software: TI-RTOS

AOA integration said that the IQ sample rate can up to 4MS/s, but the default sample rate is 1MS/s, so where can I change the configuration about the IQ ample rate? Thanks.

  • 0
    TI__Genius 9215 points
    Dear Stanford,

    The I/Q sample rate for AoA is fixed at 4 MHz and can not be changed. This might change in the future but as of today is't fixed at 4 MHz.

    Best Regards,
    R.M
  • 0 in reply to R.M
    TI__Intellectual 1000 points

    Dear R.M,

    The tone rate is 250KHz, means 250kbps, and I get 4 samples (4 16-bit I data and 4 16-bit Q data) for each bit (32 samples I and 32 samples Q for 1 byte). So the sample rate = 250k * 4 = 1MHz, means the I/Q sample rate is 1MHz now. Do you know how can I change the sample rate? Thanks.

  • 0 in reply to Stanford Li
    TI__Genius 9215 points
    Dear Stanford,

    As I said in my previous post, I/Q sample rate is 4 MHz and this can not be changed.
    The tone that you capture for AoA is a 250 KHz tone but that is independent to the I/Q sample rate.

    Since you are sampling a 250 KHz tone at 4 MHz you will get 16 I/Q samples per period of that tone (assuming a perfect 250 KHz tone).

    Best Regards,
    R.M