learning phase locked loops

Does anyone know of any sites that teach about phase locked loops. We're going throught phase locked loops in class right now, but I (and most of the people in class) don't understand what the instructors doing. I understand how a phase locked loop works, its the calculations i don't understand, the calculus and stuff. He basically wrote a whole bunch of stuff on a piece of paper and handed it to us. Went through it real quick and called it a day. I've taken calculs already, but it doesn't appear to be anything like what we did. I went and asked him and he's like its all there on those sheets of paper.

So if anyone can help, it'd be great.

You may find something of interest on my website: www.geocities.com/russlk

Don't click on the link, Geocities won't let you in. You have to copy and paste the URL into the address bar.

Good luck
Russ