Phase-Locked Loop Library

During my Diploma Thesis (in German) I had to simulate phase-locked loops (PLLs) mith Matlab/Simulink. But it was even a problem in adjusting the freuquency of a sinusoidal waveform generator so I started a Simulink library for the components, necessary for simulating analog and digital PLLs.

The Simulink PLL Library can be downloaded here

There are some example projects that uses the PLL lib:
Example for a time continous PLL
Example for a time discrete PLL

Here is a short description of the library components:

	Analog voltage controlled oscillator (VCO): Frequency and phase can be adjusted during runtime with the two inputs freq and phase. The sin output produces a 90 degree shifted signal in respect to the cos output.
	Direct Digital Synthesizer (DDS): Frequency and phase tuning words can be adjusted during runtime with the two inputs FTW and PTW. The output freuquency is f=FTW/2^Mfs, where M is the wordsize of the FTW (can be set as property) and fs is the sampling frequency of the component. The output phase can be set by φ=PTW/2^M2*π.
	Ideal phase detector: Detects the phase difference from two analytic (complex) signals and compensates phase overflows.
	Phase difference: Calculates the difference from two phase signals (range -π...&pi) and compensates phase overflows.
	Phase sum: Calculates the sum of two phase signals (range -π...&pi) and compensates phase overflows.
	Detects the frequency of a phase signal with the discrete differentiation.
	Phase unwrapp: Extends the range of a phase signal from -π...&pi to -Nπ...N&pi. The integer N can be set as property.
	Automatic Gain Control (AGC): Implementation of a simple AGC for compensating amplitude differences inside a PLL.