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Tool/software:
Hi,
I am using CC1020 as a transceiver for 433MHz UHF range. While operating it in Tx mode with +8dBm, the 2nd harmonic power level is too high i.e., -15dBc rather than specified -50dBc in datasheet. With reduction in output power say +1dBm the harmonic level is reduced to -30dBc.
Hi,
In order to step through this please can you provide the following initial information:
Regards,
Zack
Hi,
The details of test are as follows:
Hi,
Please can you describe your measurement setup in more detail?
Regards,
Zack
Hi,
When you state:
We found that the harmonic level in transceiver itself is higher than specified -50dBc for 433 MHz.
Can you share the spectrum analyser screenshot for this? Are you soldering a semi-rigid cable after the transceiver's balun/filtering network (or something else)?
Regards,
Zack
Hello,
Please find the attached spectrum images for three different PA power levels:
Low Power: PA Reg - 01h Output power: -26 dBm
Medium Power: PA Reg - 58h Output power: +1.3 dBm
High Power: PA Reg - FFh Output power: +8.0 dBm
Note that the custom board has SMA jack which is through hole PCB mount & later there is a RF cable connected to Spectrum Analyzer with insertion loss of 0.15 dB @433 MHz
Hi,
Thank you for the plots. Assuming this is the CC1020 alone (not combined with the external PA), which is what I understand from your replies, that is a very high 2nd harmonic for ~8 dBm output power.
It is worth looking at your HW design - please can you submit it using Sub-1 GHz Design Review Submission: https://www.ti.com/tool/SIMPLELINK-SUB1GHZ-DESIGN-REVIEWS
We would recommend switching to a newer device such as the CC1101 or CC110L transceivers, or the CC1311R3 SoC - this would make it easier to support and you will get better RF performance using these devices.
Regards,
Zack
Hi,
I can confirm that we've received the design review. I will mark this thread as "Resolved" as we will send the completed review via email.
Regards,
Zack