ACWWong
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As you correct say RF Front-Ends deal with signal power. As such impedance matching is needed to transfer maximum power or optimise noise figure (SNRin/SNRout) where SNR is signal to noise POWER ratio. For an integrated LNA, once on chip (after impedance matching) the signal power is converted to either signal voltage, and so is then processed as such. So now we are concerned with voltage gains (for signal voltage and noise voltage) For a PA signals on chip are say voltages, the output match converts this output voltage into a output signal power to be delivered to the load (i.e antenna).
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