Phase-Locked Loop Tutorial	[HTML]
Phase-locked loop - Wikipedia	[HTML]
Phase Locked Loop Tools and Links	[HTML]
Phase-Locked Loop Design Fundamentals	[PDF]
An overview of the phase-locked loop (PLL)	[PDF]
Phase Locked Loops - A Control Centric Tutorial	[PDF]
Phase-Locked Loops for HF Receivers and Transmitters - Part 1	[PDF]
Phase-Locked Loops for HF Receivers and Transmitters - Part 2	[PDF]
Phase-Locked Loops for HF Receivers and Transmitters - Part 3	[PDF]