Communications Blockset

Simulation Parameters

You can control the simulation parameters by selecting Simulation Parameters from the Simulation menu in the model window. This brings up the dialog box shown below.

The Max step size parameter determines the maximum step size that Simulink's variable-step solver uses to do calculations. This is set to half the period of the synthesized signal. In general, the Max step size should be less than the smallest period of all signals occurring in the model.

Voltage-Controlled Oscillator

Fractional-N Frequency Synthesis Demo