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System Simulator >
Discrete Time Analysis >
Setting Discrete Time Simulation Control Parameters with Convolution >
Step 2: Choosing the Minimum Bandwidth Control Variable

Step 2: Choosing the Minimum Bandwidth Control Variable

Another important control parameter for analyzing mixed systems is MIN_BW (please refer to the AM and PLL2 examples) which is the minimum bandwidth of an electrical component or sub-design. It is up to the user to define this minimum bandwidth as the point where the frequency domain response is down by 3dB, 10dB or more. The simulation speed and accuracy of mixed mode systems largely depends on selecting this control parameter. The parameter MIN_BW may be specified through the Discrete Time Domain System solution setup. To specify a reasonable value for MIN_BW, it may be worthwhile to evaluate the frequency response (i.e., S₂₁(f)) of electrical sub-designs using the single tone frequency domain sweep analysis discussed in the Frequency Domain Analysis topic. This will help identify the MIN_BW in the system more appropriately.

The number of frequency points used to evaluate the frequency response of an electrical component/sub-design (during discrete time analysis) is given by the next power of 2 greater than or equal to K, where

K = {Minimum power of 2 }

and the frequency step is given by

= Sweep resolution used for warning message in the discrete time domain analysis dialog

where f_s is the sampling rate of the input signal(s) to the electrical component/sub-design.

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