Cadence Spectre - table function?

[dick_freebird]

I'm wanting to simply add a table() function to a model card
but can't find any mention of Spectre offering any native
table function. Some recommendations to use veriloga,
but really?

Something like

simulator lang=spice
.MODEL N5V_edge NMOS LEVEL=3 TPG=1 TOX=1.5E-8 UO= 500 VTO=table(VTx,0,0.5,1,0.7,2,0.9)

There are other ways to skin this example, but I can't put
what I really want in a public forum. What I'm after is a
method, with as few dependencies as possible, to push
some instance properties down into a PDK model file's
model params. Like for perturbing / looping a single
device's VT while keeping other modeling untouched.

Maybe I'm stuck with a rack of combo logic / math, like

... VTO=(VTx==0)*0.5+(VTX==1)*0.7+(VTx==2)*0.9)

but that won't interpolate, like a table function should.

I've been through the Spectre manuals I could find, and
zero relevant search hits on "table" (plenty on "acceptable"
and other derivatives, just nothing to use).

Any thoughts, hints, working examples?

 

[Dominik Przyborowski]

How table function works? Maybe it is simple to implement by proper netlist procedure?

 

[FvM]

Can't use controlled voltage source with pwl?

 

[dick_freebird]

I need to use table() in .model statements to make device attributes follow a "map". This is a feature of many SPICEs.

 

[Dominik Przyborowski]

Ok, I see. It might be tricky, as Cadence policy is to not use spice built-in functions in Spectre.
The most direct solution is provided Here

I didn't check it, but number of VerilogA features can be used in bsource, so maybe va $table_model function also.

 

[dick_freebird]

Ok, I see. It might be tricky, as Cadence policy is to not use spice built-in functions in Spectre.
The most direct solution is provided Here

I didn't check it, but number of VerilogA features can be used in bsource, so maybe va $table_model function also.

Any chance a direct link could work? cadence.com won't take my login despite the PW and email being correct.

 

[Dominik Przyborowski]

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000wGhuEAE&pageName=ArticleContent

But if your credentials does not work, maybe you will need to re-verify cadence account.