How can I determine the starting and ending points of VGS selection in an ADS Keysight Power Amp implementation example?

[Bailey_NTF]

Sample video

In Image 1, the VGS starting point is from -1 to -2.
In Image 2, the VGS starting point is from 0 to -2.
Both M2 are selected with VD=26 and VG=-1.4.

How should the M1 knee point be chosen?

 

[BigBoss]

Depends on the transistor you choose. Its specifications will give you max. applicable values.