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My favorite design resource for PLLs is Horowitz and Hill's The Art of Electronics. It's only seven pages long but talks about type I and II digital, vcos and loop gain calculations. If you don't have the book, I would highly recommend it. It feels like it is written for engineers who need just the facts in order to build a circuit to help with as experiment. Amazon shows the index. Good Luck
all the tutorial is about lpll, can some one help me in designing ADPLL. what i know ADPLL consist phase detector(PD), Loop filter- design using K-1 counter and digital control oscillator(DCO) - from what i read DCO can implement using N-counter but what is N-counter. For PD i got no problom on it but the other one i dont know how to design it.