@User @User I was able to simulate the

nfet_20v0_zvt

. You need to include this file:

.include /pdk_base_dir/cells/nfet_20v0/sky130_fd_pr__nfet_20v0__tt_discrete.corner.spice

this file includes definitions for the

nfet_20v0

,

nfet_20v0_iso

and

nfet_20v0_zvt

transistors. For the

nfet_20v0_zvt

ids/vds curves are in line with the chart shown in the tests/ directory. The 'm' parameter seems to work (m=2 yields double current). Changing W / L has no effect. This is a fixed layout device. Will update the xschem symbol for these devices to avoid providing all the AD/AS/PD/PS/etc parameters as these are unused (set internally to fixed values) .