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CC1110 antenna matching

Elisa Pievanelli
Prodigy 20 points

Dear All,

I have done some experiments using the development kit of CC1110 at 868 MHz. Now I want to realize my own PCB with a dipole antenna connected to CC1110 chip. From the datasheet I know that at the output pin RF_N and RF_P there is an impedance of 86.5+j43 Ohm and the impedance of the dipole is 50 Ohm; so I have to use a filter in order to obtain a balance output with 50 Ohm impedance.

According to the design note DN017 there is a 50 Ohm impedance at blue square points (see schematic below). Can I attach my dipole here, meaning is this a balanced output?

If not, the impedance at the output of the low pass filter (red square) should be balanced. If so, what is the value of the impedance at these points? 

Thanks for your help.

Best Regards,

Elisa

  • 0
    TI__Mastermind 36385 points

    I suggest you start by getting our Antenna-DK, which has most of our current antenna's already pre-built you can then just try them one at the time.

    The impedance at the points you are pointing at could be extracted by a circuit simulations tool, but it is not something we have done.

    PS: The two blue points you have are in fact the same point and it is 50 Ohms.

    Regards,
    /TA

  • 0 in reply to TA12012
    Prodigy 20 points

    Thank you for your suggestion but I need to use a different kind of antenna, so I cannot use the Antenna-DK. 

    Is the output at the blue points balanced or not?