I am developing an 868MHz transceiver with the CC1120. I have just got my SPI link up and running and turned on the carrier to have a look at the power output and harmonics. Power and 2nd harmonic is good (direct connection), but third is poor, around -23dBM. I then measured the output from the evaluation module CC12xEM rev 1.1 and got more or less the same results. According to the datasheet it should be much better than this. I am using the Murata balun and my own 4 layer layout.
↧