Hi,
I just happen to have the transfer characteristics of a randomly selected 2N7002 (Diodes Inc.) measured with my HP4155B Semiconductor Parameter Analyzer.
The 4155B is a collection of four Source Measurement Units (SMUs) that can be programmed to step and measure semiconductor parameters. Think of it as an accurate, programmable curve tracer.
Notes:The horizontal axis is linear, the gate source voltage, Vgs, from 0 to 2V
The yellow trace is logarithmic that extends from 1 femto Amp (1E-15) to 100 milli Amp (1E-1) an astonishing 14 decades.
The blue trace is transconductance, 0 in the middle of the screen and 10 milliamps / volt at the top.
This is a single sample at room temperature.
With Vgs =0V, the drain current is 1pA
with Vgs = 1.6V the drain current is 1mA
The speed will be determined by the gate drive and the capacitances.
Regards,
Jay_Diddy_B