aaron_do
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First of all, I think you know, but just to make sure, the PAE only applies to the PA itself, not the PA + VCO. In theory there is some input power to the PA (probably very small), so you could calculate PAE if you wanted to (just probe the power going from the VCO to the PA to find Pin). But if the power gain is really very high, then your PAE will be the same as the drain efficiency. I'm not sure if I'm missing something here...you seem to already know the answer to your question.
Aaron
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