Is Pout the instantaneous peak power or the average power?
A. Average power. Q. How are you defining Power Added Efficiency? That is a term that is more commonly used for an SSPA than a TWT. The two TWT efficiencies that are most readily measured are RF efficiency and overall efficiency. RF efficiency is the RF output power at the output terminal divided by the product of the beam voltage and current. Overall efficiency is the RF output power divided by the sum of all of the input powers. I believe overall efficiency and power added efficiency are essentially the same. A. Overall efficiency.