Communications Blockset

Gain Block

A Gain block, from the Simulink Math library, multiplies the output signal from the Analog Filter Design block by a constant to produce the control signal. The Gain parameter in the mask is set to

. This expression ensures that when the model is at steady state, the frequency of the synthesized signal will remain at 100 MHz, even if you make changes to the variables fq and sen.

For the default values of the variables, the gain is equal to 7/2. Thus, in the steady state of the model, the output of the Gain block is approximately constant, with a value of 7/4.

Analog Filter Design

Voltage-Controlled Oscillator