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CC2530: Spurious emission

Andreas Nilsson39
Prodigy 170 points
Part Number: CC2530

Support Path: /Product/Development and troubleshooting/

Dear TI,

I am working on a design using a CC2530 and its built in RF transceiver.

We are experiencing problems with spurious emission at 4.88 GHz. The operating frequency is 2.44 GHz, so I am inclined to believe that the TX oscillator is involved. The problem is present even when the transmitter is not used (i e the RF transceiver is enabled, and we are in RX mode).

Help with the following questions would be greatly appreciated.

1. Is the TX oscillator always on when the RF transceiver is enabled?

2. Is the TX oscillator set to the exact same frequency as the carrier frequency?

3. If this is a common issue, what solutions do you recommend?

BR,

Andreas

  • 0
    TI__Mastermind 27145 points

    Hi,

    You might be seeing the LO (PLL) frequency. Yes, it will run always and it is twice the carrier frequency.

    What is the level you are getting?

    Did you follow our Reference Design?

    Did you compare your test result with our CC2530EM board?

    We recommend to follow our Reference Design to get better performance.

    Please refer to RF RECEIVE SECTION - Spurious Emission spec (-57dBm) and RF Transmit SECTION - Spurious Emission spec (-42dBm) of the data sheet. Also please refer to the note under RF Transmit SECTION about Spur Levels and harmonics.

    Thanks,

    PM