How to improve ADRV9026 Tx HD3 performance

Question

Hi,

I'm evalutating adrv9026 with EVAL-9026 and my own FPGA card and I got a bad 3rd Harmonic Distortion (HD3) on my ADRV9026. I'm using 3600MHz LO, Tx Test Tone with 0 dBFS gain and 0dB transmitter attenuation. The Tx Test Tone output is about 6dBm and the lower 3rd harmonic is about -45dBc, which is far more worse than the datasheet figure at 3800MHz LO.

Hope to get some advice to improve or debug it.

Thanks so much for your help!

Ramarao · Accepted Answer

We specify the HD2 and HD3 as below, snippet from Datasheet, within the 200MHz carrier BW and in the DPD synthesis BW of 450MHz 
 
 You need to have an LPF if you want to suppress the harmonics as we dont have Harmonic Reject filter in the chip.

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How to improve ADRV9026 Tx HD3 performance

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