Device Model Pointer

[umesh-timalsina]

It might be nice to integrate DeviceModel Pointer for each component that can represent a standard SPICE Model associated with it. This will be more helpful for running simulations with SPICE simulator of choice while generating the netlist.

[umesh-timalsina]

https://github.com/FOSSEE/eSim/tree/master/library/deviceModelLibrary/Templates has some templates to create DeviceModels. However, it doesn't have any description associated with it the parameters as well as no way of discerning what these parameters actually mean.

[umesh-timalsina]

https://github.com/chezou/tabula-py is a project I found for extracting tables out of a pdf file. Currently, I have been doing manual conversion of tables in http://ngspice.sourceforge.net/docs/ngspice-34-manual.pdf, line by line which gets messy/complicated. I tried it with the manual and I could get nice dataframes:

>>> df = tabula.read_pdf("http://ngspice.sourceforge.net/docs/ngspice-34-manual.pdf", pages='124')
>>> df
[        Name                                 Parameter Units  Default  Example
0    IS (JS)                        Saturation current     A  1.0e-14  1.0e-16
1        JSW               Sidewall saturation current     A      0.0  1.0e-15
2          N                      Emission coefficient     -        1      1.5
3         RS                          Ohmic resistance     Ω      0.0      100
4         BV                 Reverse breakdown voltage     V        ∞       40
5        IBV              Current at breakdown voltage     A   1.0e-3   1.0e-4
6        NBV            Breakdown Emission Coefficient     -        N      1.2
7   IKF (IK)                      Forward knee current     A      0.0   1.0e-3
8        IKR                      Reverse knee current     A      0.0   1.0e-3
9       JTUN              Tunneling saturation current     A      0.0      NaN
10    JTUNSW     Tunneling sidewall saturation current     A      0.0      NaN
11      NTUN            Tunneling emission coefficient     -       30      NaN
12    XTITUN  Tunneling saturation current exponential     -        3      NaN
13       KEG        EG correction factor for tunneling     -      1.0      NaN
14       ISR          Recombination saturation current     A    1e-14      1pA]
>>> df = tabula.read_pdf("http://ngspice.sourceforge.net/docs/ngspice-34-manual.pdf", pages='125')
>>> df
[Empty DataFrame
Columns: [Name, Parameter, Units, Default, Example, Scalefactor]
Index: [],   CJP (CJSW)           Zero-bias junction sidewall\rcapacitance    F   0.0   .1pF  perimeter
0         FC  Coefficient for forward-bias\rdepletion bottom...    -  0.50      -        NaN
1        FCS  Coefficient for forward-bias\rdepletion sidewa...    -  0.50      -        NaN
2     M (MJ)                  Area junction grading coefficient    -  0.50    0.5        NaN
3       MJSW            Periphery junction grading\rcoefficient    -  0.33    0.5        NaN
4    VJ (PB)                                 Junction potential    V  1.00    0.6        NaN
5        PHP                       Periphery junction potential    V  1.00    0.6        NaN
6         TT                                       Transit-time  sec  0.00  0.1ns        NaN, Empty DataFrame
Columns: [Name, Parameter, Units, Default, Example]
Index: [],             TM1                      1st order tempco for MJ   1/◦C   0.0              -
0           TM2                      2nd order tempco for MJ  1/◦C2   0.0              -
1   TNOM (TREF)            Parameter measurement temperature     ◦C  27.0             50
2    TRS1 (TRS)                      1st order tempco for RS   1/◦C   0.0              -
3          TRS2                      2nd order tempco for RS  1/◦C2   0.0              -
4           TM1                      1st order tempco for MJ   1/◦C   0.0              -
5           TM2                      2nd order tempco for MJ  1/◦C2   0.0              -
6          TTT1                      1st order tempco for TT   1/◦C   0.0              -
7          TTT2                      2nd order tempco for TT  1/◦C2   0.0              -
8           XTI      Saturation current temperature exponent      -   3.0  3.0pn\r2.0Sbd
9          TLEV          Diode temperature equation selector      -   0.0            NaN
10        TLEVC    Diode capac.temperature equation selector      -   0.0            NaN
11    CTA (CTC)       Area junct.cap.temperature coefficient   1/◦C   0.0              -
12          CTP  Perimeter junct.cap.temperature coefficient   1/◦C   0.0              -]