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producing ANF for Si-Wave from Gerber Data.

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Netex-G Tutorial (Fairchild).

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Netex-G Tutorial Fluent (Taiwan). 		 

Ansoft Neutral File (ANF)

NETEX-G can produce Ansoft's Neutral File. This file format is read directly by Ansoft's family of signal interity products and is read indirectly (via Ansoft Links) by the other field analysis tools such as HFSS and Spicelink.

Special Ansoft Settings

When running NETEX-G with ANF as your output format there are several important settings to use to insure that the Ansoft tools will be able to further process the results. Details ....

New SI-Wave Support

When creating ANF for Si-Wave, the standard ANF output is not suitable because it converts all data into polygons (planes) and never produces traces. Si-Wave processes planes using one algorithm and planes with a second algorithm. We have completed a routine that identifies and outputs traces for Si-Wave Details ...

New Component Support

For SI-Wave, the user would like to get a component file in addition to the ANF file which describes only the conductors on the board. While Gerber/Drill data does not include component information, the new ODB++ format can include components and we are now working on exporting the component file to go along with the ANF file Details ...


Summary of Ansoft Neutral File

The Ansoft Neutral file is an ascii file broken into sections. A small sample of the sections produced by NETEX-G is shown below:

Name and Units

NAME  LEADFRAME_ANF
UNITS  0.001

Layer Stackup

The layer stackup information defines the order of layers, gives each layer a name, specifies a material (metal, dielectric or wire), a thickness, a material, a layer color, a conductivity, permittivity and permeability.

B_LAYERS
  1  M1  METAL       0.020   copper 0x000000 5800 0 0
  2  D2  DIELECTRIC  0.020   FR4    0x000000 0.00 0 0
  3  M3  METAL       0.010   copper 0x000000 5800 0 0
  4  D4  DIELECTRIC  0.020   FR4    0x000000 0.00 0 0
  5  M5  METAL       0.080   copper 0x000000 5800 0 0
  6  D6  DIELECTRIC  0.010   FR4    0x000000 0.00 0 0
  7  M7  METAL       0.050   copper 0x000000 5800 0 0
E_LAYERS

Net Table

The net section assigns a numerical index to each net name. This keeps the resulting geometry section much smaller as each geometry points to a net.

B_NETS
  1  NET-60
  2  NET-1
  3  NET-2
  4  NET-59
  5  NET-58
  .
  .
  251  Net251
E_NETS

Padstack Definitions

The padstack section defines shapes on different layers. A via in the geometry section points to a padstack to give it physical shape.

Question ... How to Define an Anti-Pad

B_PADSTACKS
  1  PAD1
    B_PADSTACK_GEOM
      1    E  0.05     0.05     0
      3    E  0.05     0.05     0
    E_PADSTACK_GEOM
  2  PAD2
    B_PADSTACK_GEOM
      5    E  0.2      0.2      0
      7    E  0.2      0.2      0
    E_PADSTACK_GEOM
  3  PAD3
    B_PADSTACK_GEOM
      1    E  0.05     0.05     0
      3    E  0.05     0.05     0
      5    E  0.05     0.05     0
    E_PADSTACK_GEOM
E_PADSTACKS

Geometry Section

The geometry section lists each geometry - polygons, traces and vias. There are other entities in the ANF file but NETEX-G uses only those three" polygons for all metal conductors, traces for bond wires and vias to connect the various layers.

B_GEOMETRY
V 159  1   3   1   1.105        2.675        0
V 160  1   3   1   1.133        -2.675       0
V 161  1   3   1   1.17         2.675        0
V 162  1   3   1   1.198        -2.675       0
V 163  1   3   1   1.235        2.675        0
.
.
P 102  3   60   0
  -0.789       2.6752      
  -0.7897      2.668       
  -0.7849      2.6614      
  -0.7845      2.6607 
.
.
.
E_GEOMETRY



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