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(Obsolete) Single CMOS Microstrip Line Over Conducting Substrate (EM Based): SIGCMOSX



There is no replacement for this OBSOLETE element. SIGCMOSX models section of single microstrip line arranged inside the layer of silicon oxide over the conducting silicon substrate. This model is constructed as an EM Based (Table Based Interpolation) model using the results of a 2D Finite Element Method analysis. Applicability of this model is limited to several predefined configurations.



Name Description Unit Type Default
ID Element ID Text TL1
W Width of conductor Length W[1]
HS Stack height of signal conductor above boundary oxide/substrate   W[1]
L Line length Length L[1]
MSUB2 Substrate Definition Text MSUB21[2]
*AutoFill AutoFill dataBase if not equal to 0   0

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory. See AWR Microwave Office Layout Guide for details.

[2] Modify only if schematic contains multiple substrates. See the “Using Elements With Model Blocks” for details.

* indicates a secondary parameter

Parameter Details

MSUB2. Two-layer substrate parameters are listed in MSUB2 model description. Note that all MSUB2 parameters are fixed parameters (see Implementation Details section below) and must be set by user in accordance with the table in the section Parameter Restrictions and Recommendations).

W. Parameter W is independent parameter, that is, in can be set to any value within the specified limits (see section Parameter Restrictions and Recommendations).

HS. Stack height of metal level the conductor belongs to is a fixed parameter. It must be set to one of the predefined values listed in the table in the section Parameter Restrictions and Recommendations.

AutoFill. Secondary parameter which in vast majority of EM Based models controls the initiation of the Autofill operation; in these models AutoFill allows the user to specify that the entire interpolation table should be filled automatically at the current values. To instigate this filling process, this parameter should be set to one (1). During normal operation, this parameter should be set to zero (0). Access to the hidden parameter can be accomplished by double-clicking on the schematic element. This model keeps Autofill just for consistency sake: the current version of SIGCMOSX does not accept AutoFill=1 so Autofill must always be equal to zero.

Parameter Restrictions and Recommendations

  1. Substrate parameters T, Sig2 and model parameter HS must belong to one of five predefined sets presented in the following table:

    Set No T HS Sig2
    1 0.31 micron 1.11 micron 7.41 S/m
    2 0.31 micron 3.75 micron 7.41 S/m
    3 1.25 micron 9 micron 7.41 S/m
    4 4.0 micron 13.65 micron 7.41 S/m
    5 4.0 micron 13.65 micron 0
  2. The rest of substrate parameters must be set to the following values:

    • H1=15 microns

    • H2 = 6 microns

    • Er1 = 4.1

    • Er2 = 11.9

    • Tand1 = 0

    • Tand2 = 0

    • Rho = 1.19

  3. Model parameter W should be within 1.5 microns <W<28.5 microns. Model extrapolates results outside this interval.

  4. Frequency range is recommended 0.5 GHz<f<106 GHz. Model extrapolates results outside this interval.

  5. No limitations on parameter L.

Implementation Details

This model is constructed as an EM-Based model (table Based Interpolation) using the results of a 2-D cross-sectional analysis based upon the Finite Elements Method. For a more detailed discussion of the EM-Based models see EM-based Models (X-models) (Element Catalog Supplementary Information).


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

Recommendations for Use

NOTE: Default values of substrate parameters are not acceptable for this model; after placing the new substrate instance on the schematic user must set substrate parameters to the allowed values.

This model was developed under research performed at Cadence Design Systems, Inc. The full set of details of the implementation are considered proprietary in nature.

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