When S-parameter dats is exported on the Ansys Electronics Desktop to PSpice, HSpice, or Maxwell Spice software, a Full-Wave SPICE analysis can be performed. A Full-Wave SPICE analysis includes full-wave effects in a circuit simulation. If you plan to perform a Full-Wave SPICE analysis, use the Setup for Full-Wave Spice window to help determine a suitable frequency sweep range for the solution - one that captures the spectral content of a chosen impulse response.
The frequency sweep ranges suggested in the Setup for Full-Wave Spice window box are estimates. You may have a pulse with a wider frequency content and the Electronics Desktop recommended frequency sweep range may miss some of the high frequencies.
The maximum frequency of the frequency sweep range should be at least five times the inverse of the rise and fall times. If the specified frequency band is too wide, a frequency sweep may have convergence problems. If this happens, try to decrease the maximum frequency until the solution converges.
It is recommended, though not required, the minimum frequency of the frequency sweep be less than the maximum frequency divided by the number of frequency steps. It is usually recommended to have at least 500 frequency steps. A higher number slightly improves the Full-Wave Spice solution accuracy, but also increases CPU and memory requirements to solve the problem. For most cases, using 1000 frequency steps provides a good trade-off between the accuracy and computational requirements.
Occasionally, the Electronics Desktop can fail to solve for the minimum frequency during a Discrete frequency sweep due to a failure of the port solver to converge. If this happens, try to increase the minimum frequency until the solution process completes successfully. However, the minimum frequency should be as low as possible because the low-frequency response determines the steady-state time response.