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AWR1642: AWR1642 EVM RF power Spectrum Analyzer Anomalies

Jeff Feng
Prodigy 45 points
Part Number: AWR1642

Our company encountered a strange phenomenon in the application of AWR1642. At the frequency point of 78.4GHz, the RF POWER will appear as shown in the screenshot below, and the phenomenon will drop by 2.5dBm in an instant. It has been confirmed that the EVM also has such a phenomenon.

I checked the document of AWR1642 DeviceSilicon Errata, and there is no description of this problem. Can you help to clarify whether it is a problem with the software setting or the chip itself?

  • +1
    TI__Guru 58035 points

    Hello Jeff,

    Can you share the profile configuration and chirp configuration you are using?

    Regards,

    vivek

  • 0 in reply to Vivek Dham
    Prodigy 45 points 

    sensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 5 0
adcCfg 2 1
adcbufCfg -1 0 1 1 1
profileCfg 0 77 429 7 57.14 0 0 70 1 256 5209 0 0 30
chirpCfg 0 0 0 0 0 0 0 1
chirpCfg 1 1 0 0 0 0 0 4
frameCfg 0 1 16 0 100 1 0
lowPower 0 0
guiMonitor -1 1 1 0 0 0 0
cfarCfg -1 0 2 8 4 3 0 15 1
cfarCfg -1 1 0 4 2 3 1 15 1
multiObjBeamForming -1 1 0.5
clutterRemoval -1 0
calibDcRangeSig -1 0 -5 8 256
extendedMaxVelocity -1 0
lvdsStreamCfg -1 0 0 0
compRangeBiasAndRxChanPhase 0.0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
measureRangeBiasAndRxChanPhase 0 1.5 0.2
CQRxSatMonitor 0 3 5 121 0
CQSigImgMonitor 0 127 4
analogMonitor 0 0
aoaFovCfg -1 -90 90 -90 90
cfarFovCfg -1 0 0 8.92
cfarFovCfg -1 1 -1 1.00
calibData 0 0 0
sensorStart

  • 0 in reply to Jeff Feng
    TI__Guru 58035 points

    Hello,

    What is the measurement setup you are using? Do you have down converter to bring the RF frequency to a lower value? If yes can you check if this artifact is caused due to the down converter? If you slightly shift the external mixer clk input frequency and the point at which this step power reduction occurs also shifts, then it will help separate out the point at which this issue is occurring.

    regards,
    vievk

  • 0 in reply to Vivek Dham
    Prodigy 45 points

    Thanks to Vivek for his assistance