Advanced Options
The Advanced Options tab on the EM Options page of the Circuit Settings dialog box allows you to set up the de-embedding control, and the Adaptive Band Synthesis resolution control as well as additional command line options for use by Sonnet technical support.
De-Embed: Each port in a circuit analyzed by em introduces a discontinuity into the analysis results. In addition, any transmission lines that might be present introduce phase shift, and possibly, impedance mismatch and loss. Depending upon the nature of your analysis, this may or may not be desirable. De-embedding is the process by which the port discontinuity and transmission line effects are removed from the analysis results. This option is set by default.
For more details about de-embedding, please see De-embedding in the Sonnet User's Guide.
Box Resonance Info: Select this checkbox to output box resonance info during an analysis. If a potential box resonance is detected, a warning is output in the analysis monitor.Box Resonances in the Sonnet User's Guide.
Force Analysis: Selecting this checkbox forces em to perform an analysis at frequencies for which data already exists. Care should be exercised with this run option especially on larger circuits whose analysis time are significant.
Q-Factor Accuracy: Select this checkbox to increase the accuracy of the Q-factor when ABS is used. Normally ABS uses S-parameters to determine convergence. When this option is used, ABS uses both the S-parameters and Q-factor for convergence criteria. This option should be used whenever you plan on viewing/calculating Q-factor, but could require more discrete frequencies.
Single Precision: The system matrix is filled in single precision which reduces memory requirements for storing the matrix to one half of that of double precision. If this option is not used, the matrix is stored in double precision. This option affects only the matrix storage and the matrix solution. The precision of the matrix fill calculations is not affected.
Note: It is recommended that you do not use this run option when you have applied conformal meshing to polygons in your circuit.
Enhanced Resonance Detection: This feature is useful when the circuit response includes one or more extremely narrowband resonances as is typical for superconductor applications. When enabled, ABS searches for and resolves such resonances in detail by adding adaptive frequencies with very fine resolution in the vicinity of each resonance. ABS then performs a full-wave discrete simulation at each detected resonance to obtain the highest level of accuracy possible in terms of magnitude and frequency.
Other Options: This text entry box allows you to enter special analysis run options. This entry is usually only used at the direction of Sonnet support.