A customer is observing some distortions on the RF spectrum. The distortions looks like higher order RF distortion. The DAC3482's spectrum is functional and all the settings appears to be correct. Could you take a look and provide feedback to this forum post? Thanks.
From the customer:
"Two of the captures appear to be OK. The DAC_I_OUT was taken directly from the
transformer coupled output of the DAC. The board was then modified to output RF
and MOD_OUT was taken from the modulator output. Then I enabled QMC and we got
more spurs. Also of concern is the noise floor raising which is more dramatic
as the LO frequency is increased. See MOD_OUT_DISTORTION where the LO is 5.8
The atatched document revealed:
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