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CC2642R: Simpler Antenna circuit

Akihiko Fujinaka
Expert 3465 points
Part Number: CC2642R
Other Parts Discussed in Thread: LAUNCHXL-CC26X2R1

Tool/software:

Hello expert,

My customer want to use simpler antenna circuit than LAUNCHXL-CC26X2R1 antenna part show as bellow

Here are some questions.

1. How TI select the parts,  locations, numbers, and constants?

2. If the constant is changed or parts number reduced, will the wireless performance be affected?

3. We would like to change the constant and reduce the parts number. Is it possible?

Regards,

A.Fujinaka

  • 0
    TI__Expert 6470 points

    Hi Fujinaka,

    1. The parts and constant (do you mean value?) were selected based on validation and testing efforts over the years. 

    • Can you what you mean by location, and numbers?

    2. Yes, wireless performance will affected, but depending on your application and specification the reduced performance may not matter.

    3. The balun circuit can be reduced to a single-ended, internal biased configuration which would be the lowest BOM count, but at cost of 2dB lower sensitivity and 3dB lower output power. See page 7 - 10 of https://www.ti.com/lit/an/swra640h/swra640h.pdf

    • We do not recommended reducing the filter matching circuit (L12, L13, C13) as it is based on load pull measurements that balances the gain, harmonics, and current draw.
    • C14 can be removed once you are happy with the antenna performance because it is just a DC block capacitor, but notice that C12 serves this purpose while matching the the antenna to the RF front end.

    Best regards,

    Bun