q define transconductancethe control that the

Question

Q. Define Transconductance?

The control that the gate voltage has over the drain current is measured by the transconductance gfs and is similar to the transconductance  gm of the tube. It may be as follows It is the ratio of the change in drain current (ΔID) to the change in gate to source voltage (ΔVG) at constant drain-source voltage is

Transconductance g_fs = ΔID /ΔV_GS at constant VDS.