MOSFET m1 the Vertical DMOS FET requires the source and bulk to be the samenode

That statement is incorrect. In a Vertical DMOS FET (Double-Diffused Metal-Oxide-Semiconductor Field-Effect Transistor), the source and bulk are not the same node.

In a Vertical DMOS structure, the bulk region is typically connected to the substrate of the device, while the source is a separate terminal that is electrically isolated from the substrate. This arrangement allows for better control of the device and helps in reducing parasitic effects.

The source terminal is usually connected to the channel region of the device, where the current flows between the source and drain terminals. The bulk terminal, on the other hand, is typically connected to the substrate and is used to control the threshold voltage and the body effect of the device.

So, in summary, the source and bulk terminals of a Vertical DMOS FET are not the same node