Communications Blockset

Implementing an Analog Baseband PLL

Unlike passband models for a phase-locked loop, a baseband model does not depend on a carrier frequency. This allows you to use a lower sampling rate in the simulation. These two blocks implement analog baseband PLLs:

• Baseband PLL
• Linearized Baseband PLL

The linearized model and the nonlinearized model differ in that the linearized model uses the approximation

to simplify the computations. This approximation is close when is near zero. Thus, instead of using the input signal and the VCO output signal directly, the linearized PLL model uses only their phases.

Overview of PLL Simulation

Implementing a Digital PLL