Product specifications

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Figure 30b. Wideband pulse swept-frequency IMD measurements with receiver leveling
Figure 30c shows swept-power IMD measurements with the same pulse setup
as above and compares open loop and receiver leveling modes. Although IM3
traces show a few dB difference, both input and output referred IP3 are very
close to each other. This is because the difference of IM products is translated
to smaller changes of IP3 from the following IP3 formula.
IP3 = ½(3*P_main – P_im3)
where, P_main is main tone power and P_im3 is IM3 power
If IP3 is a main interest or stimulus power and IM levels are not as important as
IP3, open loop leveling mode may be acceptable.
Figure 30c. Wideband pulse swept-power IMD measurement comparisons between
open loop and receiver leveling