The energy comes from the power supplies, not from nothing...isn't it energy from nothing?
What you're missing is that you don't seem to understand decibels. If you take a 100watt amplifier and combine it with another 100watt amplifier, you get 200watts out (assuming all losses), or you have DOUBLED YOUR POWER!!. If you double your power, the power gain is 3dB. The output power goes from 40dBm to 43dBm.
I think the operation conditions aren't yet clearly defined, If you utilize the parallel circuit to double the output power (you need additional 3 dB of power gain in front of the input splitter to do so, as explained), then each amplifier is operating at the same output power and has roughly the same non-linearity and e.g. intermodulation caused ACPR as in the single amplifier setup. The ACPR would stay at previous -30 dBc.regarding the second answer, are there some equations or place where i can see why theoretically there is linearity improvement ?
Thanks to all,
i ment to increase the input power and thus get additional 3dB at output, for example if single is 40 dBm so each one will provide 40dBm and both summed power will be 43dbm
i also wonder if there is some condition that the sumed ACPR will be worser, for example if the PAs them selves be out of phase due to their production process / tolerance
s.its interesting, can you please explain why its only even order harmaonics? is there any theoretical information regarding this question?
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