This is a fundamental question which I am struggling to answer after familiarizing myself with the MOSFET and analyzing different circuits containing MOSFETS.
In terms of GDS channels, what enables a MOSFET to be used as an amplifier?
I know that
- Transconductance relates the output current to input voltage.
- Voltage gain of a MOSFET is directly proportional to the transconductance and to the value of the drain resistor.
- Gradually increasing the positive gate-source voltage VGS, the field effect begins to enhance the channel regions conductivity and there becomes a point where the channel starts to to conduct.
- We can control how the MOSFET operates by “enhancing” its conductive channel between the source and drain regions.
However, I am unable to form a logical analysis as to what really goes on in the Gate, Drain and Source channels to enable a MOSFET to be used as an amplifier.