You could refer to chapter 12 of Digital Integrated Circuits - a Design Perspective 2nd edition by Rabaey. This chapter does a great job in helping you to understand the topic.
Thanks for the reply, I currently dont have the copy of the book. For the mean time can you suggest for any URL or any related reading materials for this topic?
I am not sure whether chapter 12 of Digital Integrated Circuits by Rabaey is on EDA board or not. There are only the first 10 chapters. I suggest you to borrow the book from the library or somewhere. I recommend you to do so ~