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CC1125 frequency response

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Timothy Starr
Posted by Timothy Starr
on May 21 2012 14:41 PM
Expert1020 points

Hello-

Regarding the plot of frequency response of the CC1125 IF filter, The two plots at the bottom of page 16 of the CC1125 data sheet show selectivity versus frequency, but without much resolution. Could I please get the 1dB, 3dB, and 6dB bandwidth? Iam trying to calculate crystal offset versus sensitivity. Thank you,

-Tim Starr on behalf of SL@PL

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  • TER
    Posted by TER
    on May 22 2012 08:59 AM
    Mastermind21340 points

    Do you want to know sensitivity as a function of frequency offset to calculate how wide the RX filter has to be and/ or how large tolerance you may have on the crystal?

    --
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  • Timothy Starr
    Posted by Timothy Starr
    on May 22 2012 09:02 AM
    Expert1020 points

    Yes please.

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  • TER
    Posted by TER
    on May 22 2012 09:05 AM
    Mastermind21340 points

    Which datarate etc are you using? We have data on this for some test cases.

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  • Timothy Starr
    Posted by Timothy Starr
    on May 22 2012 10:12 AM
    Expert1020 points

    cc1125 @ 4.8kbps; 25KHz CH spacing  optimized to meet EN300-200 class 1 868 MHz

    Thanks

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  • TER
    Posted by TER
    on May 23 2012 09:05 AM
    Mastermind21340 points

    The attached plot is for 1.2kbps, 4kHz deviation, 10kHz channel bandwidth. By using feedback to the synth for the frequency compensation (see FREQOFF_CFG) the ppm range may be increased by 50%.

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  • Timothy Starr
    Posted by Timothy Starr
    on May 23 2012 11:35 AM
    Expert1020 points

    Hi TER-

    Thanks for your reply but I didn't see an attachment. Please repost or send directly to me at timothy.starr@avnet.com. Regards

    -Tim

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