CC26XX Reference Layout Long RF Traces

Alper USLU

Other Parts Discussed in Thread: CC2640

Hi,

Currently we are designing a new product which is based on CC2640. As TI suggested, we consider available reference designs for this purpose. Our design needs to be compact as possible but it also needs to provide good RF performance.

My question is about the RF trace lengths between CC26xx and antenna. As can be seen below graphics that are taken from reference layout section of CC26xx HW Training document, TI used traces whose length is long compared to RF components' length. I want to know that why long traces are used? Are they related with SMA connector or are they used to provide optimal distance between Antenna and CC26xx? If so, what is the optimal distance between Antenna and CC26xx?

Thanks

Alper

over 9 years ago

0 Fredrik K over 9 years ago

TI__Guru** 106705 points

Hi Alper,

On the EVM boards we are using long traces simply due to the board form factor requirement. As long as the impedance of the traces is 50 ohm, these will not give any noticeable RF loss.

There is no requirement on distance of the RF traces and you can make these as short as you want.

Cheers,
Fredrik

0 Alper USLU over 9 years ago in reply to Fredrik K

Prodigy 210 points

Thanks Fredrik!

Regards,
Alper

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CC26XX Reference Layout Long RF Traces