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Search Tips Main Support: Knowledge Center > ADS Support Home > ADS Documentation (all releases) Documentation: On This Page LineCalc Components Components and Parameters References/Shared Parameters Parameter Definitions Changing Parameter Defaults Additional Resources What's New Articles Knowledge Center Technical Support Contact Training Videos LineCalc Components Components and Parameters Components and Associated Parameters lists the LineCalc-supported components and any associated parameters that can be modified or calculated. Components are grouped by substrates and details regarding their electrical and physical values, references, and other computed results are given. Components and Associated Parameters Component Electrical Parameters Physical Parameters Substrate Parameters Calculated Values COAX Z0 E_Eff Di Do L Er TanD Rho Sigma A_DB RWG Z0 E_Eff A B L Er Rho TanD Mur TanM Sigma K_Eff A_DB Components using the CPWSUB substrate (CPWSUB = * ) CPW Z0 E_Eff W G L Er Mur H Hu T Cond TanD Rough K_Eff A_DB SkinDepth CPWCPL2 ZE ZO Z0 C_DB E_EffComponents using the SSUB substrate (SSUB = * ) W G S L Er Mur H Hu T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth CPWCPL4 ZE ZO Z0 C_DB E_Eff W = Wi G S = Si L Er Mur H Hu T Cond TanD Rough K_Eff KE KO AE_DB AO_DB SkinDepth CPWG Z0 E_Eff W G L Er Mur H Hu T Cond TanD Rough K_Eff A_DB SkinDepth Components using the FSUB substrate (FSUB = * ) BFINL Z0 E_Eff D L Er Cond Fa Fb Fdw K_Eff A_DB SkinDepth IFINL Z0 E_Eff D L Er Cond Fa Fb Fdw K_Eff A_DB SkinDepth UFINL Z0 E_Eff D L Er Cond Fa Fb Fdw K_Eff A_DB SkinDepth Components using the MSUB substrate (MSUB = * ) MCLIN ZE ZO Z0 C_DB E_Eff W S L Er Mur H Hu T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth MLANG ZE ZO Z0 C_DB E_Eff W S L Er Mur H Hu T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth MLANG6 ZE ZO Z0 C_DB E_Eff W S L Er Mur H Hu T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth MLANG8 ZE ZO Z0 C_DB E_Eff W S L Er Mur H Hu T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth MLIN Z0 E_Eff W L Er Mur H Hu T Cond TanD Rough K_Eff A_DB SkinDepth Components using the SSUB substrate (SSUB = * ) SBCLIN ZE ZO Z0 C_DB E_Eff W S L Er Mur B T Cond TanD AE_DB AO_DB SkinDepth SCLIN ZE ZO Z0 C_DB E_Eff W S L Er Mur B T Cond TanD AE_DB AO_DB SkinDepth SLIN Z0 E_Eff W L Er Mur B T Cond TanD A_DB SkinDepth SLINO Z0 E_Eff W S L Er Mur B S T Cond TanD A_DB SkinDepth SOCLIN ZE ZO Z0 C_DB E_Eff W WO S L Er Mur B T Cond TanD AE_DB AO_DB SkinDepth Components using the SSSUB substrate (SSSUB = * ) SSCLIN ZE ZO Z0 C_DB E_Eff W S L Er Mur H Hu Hl T Cond TanD Rough KE KO AE_DB AO_DB SkinDepth SSLIN Z0 E_Eff W L Er Mur H Hu Hl T Cond TanD Rough K_Eff A_DB SkinDepth References/Shared Parameters References/Shared Parameters lists the LineCalc-supported references/shared parameters. References/Shared Parameters References/Shared Parameters Parameters Parmeter Name Default Value CPWSUB Er H T Cond Rough TanD Hu Mur COND 10.0 25.0 0.150 4.1e7 0.0 0.0 3.9e+07 mil 1.0 Cond FSUB Er Fdw Fa Fb Cond 2.2 62.5 mil 900.0 mil 400.0 mil 5.8e7 MSUB Er H T Cond Cond1 Cond2 Rough TanD Hu Mur Diel1 Diel2 Hole Res 9.6 10 mil 0.150 4.1e7 Cond Cond1 0.0 0.0 3.9e+34m 1.0 Diel Diel1 hole resi SSSUB Er H T Cond Rough HU HL TanD Mur COND 10.0 25.0 0.150 4.1e7 0.0 100.0 100.0 0.0 1.0 Cond SSUB Er B T Cond Cond1 Cond2 TanD Mur 2.5 62.5 0.150 5.8e7 Cond Con1 0.0 1.0 Note: The default MSUB Cond value has changed to be 4.1e7 (the conductivity of gold). Parameter Definitions Parameter Definition A Width of rectangular waveguide A_DB Total attenuation of the structure in dB AE_DB Total even mode attenuation of coupled section in dB AO_DB Total odd mode attenuation of coupled section in dB B Ground plane spacing from top to bottom (stripline) or height of rectangular waveguide C_DB Coupling factor in dB, i.e., C(dB) = 20log10 [(ZE-ZO)/(ZE+ZO)] D Gap width in length units DI Inner diameter (COAX) DO Outer diameter (COAX) E Electrical length of line or coupled section (angle units) E_EFF Effective electrical length of line or coupled section (angle units) E_MEAN Mean electrical length of coupled microstrip or coplanar waveguide section (angle units) ER Substrate relative dielectric constant G Gap between conductor and ground planes (CPW, CPWG) H Substrate thickness in length units HL Lower ground plane to substrate spacing in length units HU Upper ground plane to substrate spacing in length units HC Distance from top cover to top of substrate in length units KE Even-mode effective dielectric constant: KE=[C/Vp(even mode)]2 K_EFF Effective dielectric constant: K_EFF=(C/Vp)2 KO Odd-mode effective dielectric constant: KO=[C/Vp(odd mode)]2 L Length of line or coupled section MUR Relative permeability Rough RMS surface roughness in length units S Spacing between lines SI Spacing between inner center conductors (CPWCPL4) SIGM Dielectric conductivity value in Siemens per meter T Metal thickness TAND Dielectric loss tangent TANM Magnetic loss tangent TEMP Temperature; can not be modified by the user W Width of line WI Width of inner center conductors (CPWCPL4) WO Offset of coupled lines for offset coupled stripline Ze Impedance for even-mode Zo Impedance for odd-mode Z0 For coupled-line components, such as SCLIN or MCLIN, Z0=sqrt(Ze × Zo) Changing Parameter Defaults The default parameters that appear in the LineCalc window for editing are set in a file called lcuiinit in the directory $HPEESOF_DIR/linecalc/lib (where $HPEESOF_DIR represents the complete path for your installation). You can make a local copy of this file and change the default parameters so that less editing is required whenever you use LineCalc. To modify the lcuiinit file: Copy the file lcuiinit to a directory of your choosing. Using any text editor, make the desired changes. Save the file. Now you need to tell the program where to look for your customized file. Make a local copy of the LineCalc configuration file linecalc.cfg found in $HPEESOF_DIR/config. Copy this file to $HOME/hpeesof/config. Using any text editor, locate the variable LCALCUI_INIT_FILE and modify the path to point to the location of your modified lcuiinit file. Note On the PC, $HOME represents the path you specified as the Home Folder during installation ( C:\users\default by default); $ HPEESOF_DIR represents the path you specified as your Program Folder during installation ( C:\AdvDesSys ). The component definition format is: ELEMENT <element_name> <element_id> <# of ports> <units> <physical> [<physical_fixed> <physical>] <subst> <tand> <sigma> <temp> <electrical> [<electrical_fixed><electrical>]<result> For example: ELEMENT COAX COAX_DEFAULT 4 UNITS PHYSICAL PHYSICAL_FIXED PHYSICAL SUBST ELECTRICAL RESULT UNITS UNITS_DEFAULT FREQ_VAL=10.00 FREQ=GHz LENGTH=mil RES=ohm ANGLE=deg PHYSICAL DI=37.00 PHYSICAL_FIXED DO=90.00 PHYSICAL L=650.00 SUBST COAXSUB=COAXSUB_DEFAULT ER=2.10 TAND=0.0003 RHO=1.0 ELECTRICAL Z0=35.00 E=90.00 RESULT A_DB=0.01   Please help us improve Was this topic helpful? 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source: Ports in Momentum

Defining a Differential Port

Differential ports should be used in situations where an electric field is likely to build up between two ports (odd modes propagate). This can occur when:

• The two ports are close together
• There is no ground plane in the circuit or the ground plane is relatively far away
• One port behaves (to a degree) like a ground to the other port, and polarity between the ports is developed.
• The ports are connected to objects that are on strip metallization layers.

The electric field that builds up between the two ports will have an effect on the circuit that should be taken into account during a simulation. To do this, use differential ports.

Differential ports have the following properties:

• They can be applied to objects on strip layers only.
• They are assigned in pairs, and each pair is assigned a single port number.
• Each of the two ports is excited with the same absolute potential, but with the opposite polarity. The voltages are opposite (180 degrees out of phase). The currents are equal but opposite in direction when the ports are on two symmetrical lines, and the current direction is approximated for other configurations.
• The two ports must be on the same reference plane.
  

  Note Port numbers for differential ports are treated in the following manner: On the layout, you will continue to see the port numbers (instance names) that were assigned to each port when they were added to the layout. Use the Momentum Port Editor dialog box to identify which pair of ports will be treated as a differential port. When Momentum simulates designs containing non-consecutive port numbers, the ports are remapped to consecutive numbers in the resulting data file. The lowest port number is remapped to 1, and remaining numbers are remapped in consecutive order. The port numbers are not changed in the design itself . A message in the Status window announces the change, and lists the mappings. For example, if you are simulating a design with ports numbered 1 and 3, the following status message informs you of the changes: Layout has non-consecutive port numbers. Output files will have consecutive port numbers. layout port -> output port 1 -> 1 3 -> 2 Also, when you view results, you will see S-parameters for the differential port numbers. In the example above, the layout would show p1, p2, p3, p4. The S-parameter results will be for combinations of the original P1 and P3 only.

  To define a differential port:

1. Choose Momentum > Port Editor .
2. Select the port that you want to assign this type to. Note the port number.
3. In the Port Editor dialog box, under Port Type, select Differential .
4. Under Polarity, make sure that Normal is selected.
5. Click Apply .
6. Select the second port.
7. In the Port Editor dialog box, under Port Type, select Differential .
8. Under Polarity, select Reversed .
9. Under Associate with port number, enter the number of the previously-selected port.
10. Click Apply .
11. Repeat these steps for other differential port pairs in the circuit.
12. Click OK to dismiss the dialog box.

Layout processing started
Layout processing finished
S-parameter simulation started
...initializing
...analyzing ports
...extracting layout
...expanding thick conductors
...reducing mesh
Frequency sweep started
Simulation frequency [1] = 10 MHz
...loading Green functions
WARNING: Could not create the dataset
since no citi files could be found.
...saving project files

---------------- Momentum stopped ----------

Solution:
Start ADS2009
Run task manager (Ctrl+Alt+Del)
In processes tab, find "hpeesofemx.exe" and right click it, choose "Set Affinity"
Untick to reduce CPUs if you have multicore. Simulation should work perfectly with CPU 0 & CPU 1 selected. You can raise CPU number later to check if it still work.(My case works with 6 in 8 CPUs).
Now I am working on XP 64 bit OS with ADS2009 without this stubborn error.
Good luck

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