Why is it that when I see single MOSFET amplifiers or even complementary ones (one NMOS and PMOS), they would use what in single BJT amplifiers would be called "Common Emitter Amplifier". The output is on the Drain side of the MOSFET. This always outputs an inverted signal.
I could see the advantage in BJT as that would provide the highest voltage sourcing, though it will be inverted. This inversion, I've always supposed, does not matter in the application it's usually used for, say working with 1.) frequency or 2.) averaged or RMS amplitudes, etc.
But doing the same with MOSFET (output from Drain or Common Emitter), the signal is also inverted. It would be okay while working with (1) and (2) above, but not for anything else. But if we used the Source side for NMOS and PMOS's, we get a non-inverted output and SHOULD BE the same amount of amplification.
I don't get it... Is it because the tutorials/articles are just following the pattern set up by single BJT Amplifier examples?
EDIT: I replaced "Common Emitter" with "Common Base", as I thought I had it wrong. Then it was pointed out that it really was "Common Emitter", so it was editted back.
Just to clarify everything I am providing this response so that we are all on the same page. I dunno, I must be the one who's not...
This is what I know to be a NPN Common Emitter:
Sources from V_DD, hence higher voltage amplification, but inverted.
This is it's direct equivalent in NMOS (I just checked and this seems to be a Common Source, though my example lacks a resistor on the source side)
This is what meant:
or for complementary (and my original intended question):
(The Opamp above, for simplicity, does not do any feedback for amplification)
With the last figure above was my original intended question, but I just had to ask what I'm asking here before I go with this.