Multiple ABS Sweeps and Subsectioning

If you will need to run multiple ABS sweeps on a project, it is important to set your ABS caching to Multi-sweep to avoid having to re-calculate your caching data each time you analyze your circuit. But be aware that in order to maintain the validity of the caching data, the subsectioning of the circuit must remain the same. To control the subsectioning you must use the Advanced Subsectioning Controls found in the Advanced Subsectioning in the Advanced Options in the EM Options page in the Circuit Settings dialog box in the project editor. To access these options, select Circuit ⇒ Settings, then click on "EM Options" in the sidebar menu of the Circuit Settings dialog box which appears. If the Advanced Options are not displayed click on the > Advanced Options button, then select the Advanced Subsectioning tab.

NOTE: The most efficient way to obtain response data for your circuit is to run a single ABS sweep over the entire desired frequency band.

The analysis engine, em, uses the subsectioning frequency to calculate the wavelength which is used in setting the Maximum subsection size. The default setting used to determine the subsectioning frequency is to use the highest frequency from the present analysis job. If you perform multiple sweeps over different frequency bands then the cache data from one run will be invalid for the next, since the subsectioning frequency would be different. In order to avoid this you should select the Previous Analysis Only option which will use the highest frequency from all previous analysis jobs run on the project. In this case, you should analyze the frequency band with the highest upper limit first and take care to ensure that the subsectioning frequency being used provides accurate subsectioning for your circuit. For details on subsectioning, see Subsectioning.

Another way to keep the subsectioning frequency consistent is to select the Fixed Frequency option for the subsectioning frequency and enter the desired frequency. This ensures that all analysis runs on the project will use the same subsectioning frequency. Again, care should be taken that the subsectioning frequency entered provides the desired accuracy.