Communications Blockset

Running the Simulation

When you run the simulation, you see signals appear in the three Scope windows, as shown below.

The control signal, which the Voltage-Controlled Oscillator block uses to maintain the frequency of the synthesized signal, initially fluctuates for about 10 microseconds, but then stabilizes to a constant value of 7/4. This occurs when the model reaches a steady state - that is, when the frequency of the synthesized signal is close to 100 MHz. Similarly, the synthesized signal oscillates back and forth at first, but then stabilizes to a square pulse of frequency 100 MHz. The reference signal is a square pulse of frequency 30 MHz.

The Display block at the lower right of the model window displays the frequency of the synthesized signal, as shown in the figure below.

Variables in the Model

Blocks in the Model