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How to Improve Range of CC2500 RF chip

Hemant Jadhav51591
Prodigy 40 points

Other Parts Discussed in Thread: CC2500

Hey friends m working on CC2500 RF IC since last 2 weeks. I have designed my own Rf board according to specification given on TI .I Board is working properly.I have configrued my CC chip using Smart Rf studio settings.I am using FSK2 mode and default baud rate of 115.2k.

I have 10 numbers of prototype board with me. I have interfaced those board with atmega board.Problem that i am facing is,out of 10 almost every one transmit a packet of 32 character at distance of 15 feets (line of sight).But reception range of 8 trans reciever is almost 5 to 6 feets. Only 2 CC2500 modules give me the range of 15 feets.

If my all boards are having same RF design and solder by myself with same material and same procedure and driven by same source code.Why so much of diffrence is there.

What you people think which factor is most important in improving the range of these modules.

Which points should we consider while designing.

 

  • Prodigy 40 points

    Did you check if your matching network for the antenna is within tolerance and not detuned?

    Try to move your frequency to the other side of the frequency band (same Problems with 2,4 and 2,483 GHz?) and try again.

  • in reply to Martin Sisko
    Prodigy 40 points

    Thank you Martin :-)

    I was facing this problem because ground pad under the IC was not properly grounded.

    After fixing it properly range is improved.

    After that i also tried different frequency bands but there is no much differnce

    Which channels should I prefer for noiseless and efficient performance

    I mean channels near to 2.4   or channel 2.483 or channels in between

    does it make any difference?

  • TI__Expert 4435 points

    You must understand when copying the reference design you must be exact.  The RF sections traces are tuned for the board operation.  So the balun filter match to the antenna's input impedance.    This is not low speed layout it is based upon tuned circuit at 2.45GHz to deliver the maximum power to the antenna.  It sounds as if you paid no attention to the reference PCB thickness then made a board change that is now attenuating all the power to the antenna.   You need to start all over an do it right.  Try reading AN068 for some insight on scaling the RF section for board thickness. 

    TI Low Power Wireless Group

  • TI__Expert 4435 points

    You must understand when copying the reference design you must be exact.  The RF sections traces are tuned for the board operation.  So the balun filter match to the antenna's input impedance.    This is not low speed layout it is based upon tuned circuit at 2.45GHz to deliver the maximum power to the antenna.  It sounds as if you paid no attention to the reference PCB thickness then made a board change that is now attenuating all the power to the antenna.   You need to start all over an do it right.  Try reading AN068 for some insight on scaling the RF section for board thickness. 

    TI Low Power Wireless Group