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Can I generate a signal that increases in a step-wise fashion at a fixed interval using the XMODEL primitives?
Perhaps the difficulty lies in the fact that the signal to be generated is not periodic by itself. There are multiple ways to generate the desired signal using the XMODEL primitives.
1. Using the integ
primitive
You can create a periodic chain of pulses first using a pwl_gen
primitive and then integrate it using an integ
primitive to produce a signal that increases in a step-wise fashion. In this case, the area of each pulse and gain of the integ
primitive determine the amount of each step change, while the width of each pulse determines the transition time, and the init_value
parameter of the integ
primitive sets the initial output value.
For example, the following model generates a signal that increases by 10mV at 200ns interval.
2. Using the sample
primitive
Another way is to use a sample
primitive. For instance, the model shown below uses an add
primitive to compute the next output value based on the current output value, and uses a sample
primitive to determine when the output is updated by that next value. Hence, the input to the add
primitive determines the amount of step change, and the trigger period for the sample
primitive determines the step period. The buffer
primitive is for setting the initial output value using its init_value
parameter. The model shown below generates a signal that increases by 10mV at 200ns interval.
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