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more descriptions into README

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Holger Vogt 2025-12-07 17:06:27 +01:00
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README.degmon
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Degradation monitor
The degradation monitor is a code model with 4 inputs, to be paralleled to
aMOS transistor, for monitoring (reading and integrating) the
a MOS transistor, for monitoring (reading and integrating) the
stress voltages on the device.
To start a degradation sim, put flag 'de' to ngbehavior, e.g. as
set ngbehavior=hsdea
in .spiceinit.
Degradation model parameters have to be provided, as shown in the example
file ngspice-master/examples/degradation/aging_par_ng.scs, starting with
.agemodel devmodel=sg13_lv_nmos simmodel=HCI1
+VGS0=0
+ <other parameters>
A code model monitor like
adegmon1 %v([z a vss vss]) mon degmon1
.model degmon1 degmon (tfuture=315336e4 l=0.15e-6 devmod="sg13_lv_nmos")
will automatically be added to each MOS device (here of type sg13_lv_nmos).
A .agemodel command with devmodel=sg13_lv_nmos is required (see aging_par_ng.scs).
The simulation model names by 'simmodel=HCI1' is coded into the above
cited code model monitor (see ngspice-master\src\xspice\icm\xtradev\degmonitor
with its 2 files cfunc.mod and ifspec.ifs.
The output is a list of the 3 degradation parameters provided by the HCI1 model.
Examples are provided in ngspice-master\examples\degradation