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TI Home » TI E2E Community » Support Forums » Low Power RF & Wireless Connectivity » Low Power RF Hardware & Tools Forum » CC1101 Sensitivity Testing in MSK Mode
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CC1101 Sensitivity Testing in MSK Mode

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Jerry Shore
Posted by Jerry Shore
on Dec 26 2012 09:04 AM
Prodigy60 points

From looking at datasheet it appears I cannot duplicate the CC1101 MSK modulation exactly using a signal generator.  Is that opinion correct?

How does TI suggest checking the sensitivity in MSK mode using a signal generator? By sending raw data not packets?

Thanks,

Jerry

CC1101 MSK sensitivity testing
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  • Sverre
    Posted by Sverre
    on Dec 27 2012 02:29 AM
    Genius14150 points

    Your opinion is correct..

    When MSK modulation is enabled, the DEVIATION_M field sets the fraction of symbol period used for phase change.

    DEVIATION_M = 0 means that the phase is changed within 1/8 of a symbol.

    DEVIATION_M = 7 means that the the whole symbol period is used to change phase.

    Higher data rates need faster phase changes.

    CC1101 configured for MSK modulation will not receive a 2-FSK modulated signal from an arbitrary transmitter (incl CC1101). Reason being that the CC1101 MSK is inverted.

    • TX(2-FSK) -> CC1101(MSK) does not work
    • TX(2-FSK, invertert) -> CC1101(MSK) works


    You should consider using 2-GFSK with a modulation index = 0.5 instead of the CC1101 MSK option.

     

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  • Jerry Shore
    Posted by Jerry Shore
    on Dec 27 2012 09:37 AM
    Verified Answer
    Verified by Jerry Shore
    Prodigy60 points

    Thank you for the information.

    Jerry

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