When a MOSFET is working in its saturation region, it might be used as an amplifier. But, as far as I understand, the more you increase
vGS (voltage between the MOSFET's gate and ground) the less output voltage you get, which is the opposite of amplifying. Let me explain:
Having this (supposed) amplifier:
when it is in saturation region, it behaves as a VCCS, which, apparently, leads to an amplifiers' behaviour:
In the above picture,
vO will be
VS - eL, if
eL is the voltage drop in
RL. Following the
iD equation, the more vIN incrases, the more voltage drop you will have in
RL, right? That means that the more
vIN increases, the more
vO decreases. That isn't amplifying, but the opposite.
What am I missing?