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Converting HSPICE model to ESPICE model

wERerABbiT

Hi All,

I'm trying to manually converting a HSPICE subcircuit to ESPICE so it can be used in Allegro SI. (no i dont have HSPICE license)

The circuit contains a Lossy Transmission Line

.model ms50 u level=3 elev=1 dlev=2 plev=1 nl=1 nlay=2 ht=139.6e-6 wd=164.9e-6  th=16.5e-6 ts=430e-6 kd=3.8

_______________________________________________

level=3     --> Lossy Transmission Line Model
elev=1      --> Electrical Model = Geometry
dlev=2      --> Dielectric Model = Stripline
plev=1      --> Physical Model = Planar
nl=1        --> Number of Conductors = 1
nlay=2      -->
ht=139.6e-6 --> Height of All Conductors = 139.6 micrometer
wd=88.8e-6  --> Width of Each Conductor = 88.8 micrometer
th=16.5e-6  --> Thickness of All Conductors = 16.5 micrometer
ts=430e-6   --> Distance Between Reference Planes (Stripline Only) = 430 micrometer
kd=3.8      --> Dielectric Constant = 3.8

 _______________________________________________

 

ESPICE uses the Multi-Conductor Transmission Line Model (

Nxxxxxxxx (ni1 ni2 ....nri) (no1 no2 ..... nro)
L=length-in-meters [file=RLGC_input_file_name rlgc_name=data_name_tag
skin_cutoff_freq=fskin dielecloss_cutoff_freq=fdielec]

which requires the RLGC values.

 

1) How do I obtain the RLGC values from the HSPICE model? (Do these values default to a certain value when not given?)

2) Is there a better way to define the lossy transmission line?

 

Thanks All 

  • redwire

    Take the simple approach and build a transmission line in Allegro with the same parameters.  It's missing the Df values to be a valid model but I would use .015 for a starting point until you know what material was selected.

    Allegro SI will extract a lossy tline with the values in the HSPICE description. 

  • wERerABbiT

    It worked!! 

    Used sigXplorer, placed a stripline and entered the HSPICE parameters. 

    R = 11.43 ohm/M

    L = 380nH/M

    G = 0.0171 mho

    C = 111.2 pF/M

    Thanks Redwire!!

     

  • wERerABbiT

    Hi All,

    The ESPICE Multi-Conductor Transmission Line Model is

    Nxxxxxxxx (ni1 ni2 ....nri) (no1 no2 ..... nro)
    L=length-in-meters [file=RLGC_input_file_name rlgc_name=data_name_tag
    skin_cutoff_freq=fskin dielecloss_cutoff_freq=fdielec]


    1) May I know the purpose of "name=data_name_tag" ?

    2) R and G values are frequency dependent. For the RLGC file, how many different frequencies (with corresponding RLGC values) should I include? Also, what should I set for the cutoff frequency?

    Thanks All 

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