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HFSS15: Guidelines for Calculating Frequencies for Full-Wave SPICE
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Guidelines for Calculating Frequencies for Full-Wave SPICE
• The maximum frequency should be at least five times the inverse of the rise and fall times. If the specified frequency band is too wide, an HFSS 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, that the minimum frequency 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 will slightly improve the full-wave SPICE solution accuracy, but will also increase 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.
Warning | Occasionally, HFSS can fail to solve for the minimum frequency during a Discrete or Interpolating 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. |
• The suggested frequency sweep ranges are estimates. You may have a pulse with a wider frequency content and HFSS’s recommended frequency sweep range may miss some of the high frequencies.
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