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HFSS and Planar EM Simulators > Setting up a Full-Wave SPICE AnalysisTo determine a suitable frequency range for a solution that will be used for a Full-Wave SPICE analysis: 1. Click Setup Full-Wave Spice in the sweep setup dialog box. The Setup for Full-Wave Spice dialog box appears. 2. Type a value in the Signal Rise Time text box. This value represents the time scale that will characterize the rate of change of the input time signal to be applied in the circuit simulator. By default, this value is set to 1. 3. Type a value in the Time Steps Per Rise Time text box. By default, this value is set to 5. The time sampling increment for the entire
signal is calculated using
where • Dt is the time sampling increment. • t is the signal rise time. • Nt is the number of time steps per signal rise time. 4. Enter a value in the Number of Time Points text box. By default, this value is set to 500. Note that the input time signal duration is determined using N ´ Dt, where N is the number of time points. 5. Click Calculate. Designer determines the Maximum Frequency
using
where Fmax is the maximum frequency. It determines the Frequency Step Size
using
and determines the Number of Frequency Steps using N - 1. 6. Click Accept to transfer the new frequency sweep data to the frequency sweep fields in the sweep setup dialog box. • Optionally, click Cancel to return to the sweep setup dialog box and maintain previously entered frequency sweep settings.
The topics for this section include: Guidelines for Calculating Frequencies for a Full-Wave SPICE Analysis
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