[Ngspice-users] Finfet inverter fails

[Mehmet C. <ma...@li...>]

I have attached a test circuit for ngspice 40, no mpi. It is using finfet
models and cells from openpdk asal7. OSDI file is generated using openvaf
23.2.0.  I changed 'm' devices to 'n' device type in the netlist.
In the model files I have replaced nmos level 72 with BSIMCMG_va type=1,
and pmos with
BSIMCMG_va type=-1. The example model file uses type=0 for pmos, while the
original modes had no such variable. Changing type to 0 or -1
make a little bit difference in the numbers, but it still is not functional.

I tried with two different .tran lines changing the first argument.
There is a min step size issue with both, in one case it completes
simulation, it aborts in the second case.

Openvaf test suite reports illegal instruction core dumps for some models.
In this case, it did not.

There may be a false transient convergence issue or there may be a problem
with OSDI. This circuit works with Xyce.

Regards


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