Forward transconductance, gfs, represents the signal gain (drain current divided by gate voltage) of a MOSFET. Higher gfs indicates the high current (IDS) handling capability can be gained from the low gate voltage (VGS). It is also expressed as below equation.

What is transconductance of a MOS transistor?

Similarly, in field effect transistors, and MOSFETs in particular, transconductance is the change in the drain current divided by the small change in the gate/source voltage with a constant drain/source voltage.

What is GM in FET amplifier?

• FET Small-Signal Model. • Trans-conductance. The relationship of VGS (input) to ID(output)is called trans- conductance. • The trans-conductance is denoted gm.