khouly said:Case 2
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make 2 tone test to plot the fundametal by this will plot the 1 dB compression point
and plot the IM3
this will result about 15 to 16 dB difference between 1 dB and IP3
khouly
RF-OM said:Theoretically it is not difficult to show that IP3 is 9.54 dB higher than P1dB point. This is why 10dB is considered as rough estimate. But such analysis is done with suggestion that coefficients into polynomial members are constant. But when signal exceed P1dB point it may be not true anymore. Some power amplifiers have IP3 just about 1 dB above the P1dB level. For broadband amplifiers third order is not always well enough represent actual IMD. Higher order products may contribute a lot and reduce IP3 level.
iaman said:RF-OM said:Theoretically it is not difficult to show that IP3 is 9.54 dB higher than P1dB point. This is why 10dB is considered as rough estimate. But such analysis is done with suggestion that coefficients into polynomial members are constant. But when signal exceed P1dB point it may be not true anymore. Some power amplifiers have IP3 just about 1 dB above the P1dB level. For broadband amplifiers third order is not always well enough represent actual IMD. Higher order products may contribute a lot and reduce IP3 level.
yes, I think so. Acturally I think Case 2 test is more accturater than Case1. From my experince , i think IIP3=IIP1+13
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