Hi guys,

I have a question. Given a simple bias circuit of a nmos, I would like to check the PAE.

Am running Cadence Virtuoso Spectre and the result is that a simple class C PA gives me lower PAE than Class AB or even Class A? Does anyone know the reason for it?

I have already made sure the power at the 2nd, 3rd harmonics are well below -20dBm and from the PSS function, i checked on PAE and selected the fundamental frequency in which i would like to measure its PAE.

I have also used a simple LC oscillator tank to make sure i've filtered out all the harmonics leaving only the fundamental.

Any help would be appreciated. Thanks!

It's okay guys. I've managed to solve this. Thanks for reading

Natnoraa