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CC430 RF Circuitry and Antenna based on Chronos RF Access Point

John Schnellenberger
Prodigy 130 points
Other Parts Discussed in Thread: CC430F6137, CC1101

Hi,

We are thinking of using the same RF circuitry and antenna that was used on the Chronos 915MHz RF Access Point for our CC430F6137 915MHz design.  This includes a 0896BM15A0001 balun, a small matching network of capacitors and inductors (5.6nH, 1.8pF, 100pF, 5.6nH, 12nH), a 0915AT43A0026 chip antenna, and a specific PCB trace  Could you please answer the following questions when you have time?

1)  Is it alright to use this RF circuitry and antenna for our CC430 (based on CC1101) even though the Chronos RF Access Point uses a CC1111?

2)  The Chronos RF Access Point RF circuitry and antenna appear to be based on Design Note DN016.  However, the matching network recommended in this design note is different than the matching network used on the Chronos RF Access Point.  Could you tell me why they are different? 

3)  Our PCB will have a ground plane that is approximately 2.5" x 3.5" which is about 4 times larger than the Chronos RF Access Point ground plane of 0.6" x 0.8".  Do you think that this will cause a significant change in antenna performance?  If so, do you think that changing component values in the matching network will be sufficient or will the PCB antenna trace length need to be changed?

Thanks for your time.

John 

  • 0
    TI__Mastermind 36395 points

    John,

    You wrote:

    1)  Yes, this would work. The RF circuitry inside the CC430 and the CC1110 (System on Chip) is the CC1101 (transceiver). The only difference is size of the packages and we have found that the same matching works across all three platforms.

    2) The Chronos was made at the same time as the balun and we later found a slightly better design. Please refer to Johansen most update appnote on the current recommendations 

    3)  When it comes to antenna's and PCB sizes, it is actually better with a larger ground plane. The optimum values for the match should not change by changing the "ground plane" size from "Chronos sized" to your size and if it does it will not be much. The overall performance of the antenna system will go up significantly by increasing the PCB size

    Regards
    /TA