Well, as I stated in other Dr. Razavi's book reviews, it's my pleasure to own and read every book written by Dr. Razavi. I have been waiting for this new edition for some time, and immediately purchased this 2nd edition from amazon.com once it's published. As an RF/analog engineer, I personally have benefited from all of his masterpieces. Many thanks for the author's great efforts, Dr. Razavi's books have influenced many engineers and students in the RF/analog area.
So, how is this 2nd edition? In my opinion, it might be inappropriate to call it "2nd edition" as this is a completely new book with vast improvements from the 1st edition. We have experienced a rapid growth of RF design within last decade, and this book covers most of the fundamentals of RF circuit/system design techniques to deal with today's challenges. It's understandable that some of the readers are not happy with the 1st edition in their reviews, but this new book is totally different (Dr. Razavi says there's only 10% overlap between two editions in his preface to the 2nd edition, it's absolutely true). Here is what I like most:
1. Dedicated chapters for LNA and mixers; 2. Great coverage on passive devices; 3. Three chapters to cover frequency synthesizers, which cover fundamentals, integer-N and fractional-N synthesizers; 4. Step-by-step tutorial of modern RF transceiver design; 5. In addition to all the new materials on RF systems and circuits, one of the biggest improvements is that the author incorporated hundreds examples/problems in the book. Some help readers understand RF fundamentals, and some are very practical issues facing RF engineers.
There are several errors in the book, make an online search you'll be able to find the errata to the 2nd edition.
And of course, the coverage of RF design by a single book is limited though it has over 900 pages. Here are some of my recommendations if you are interested in other RF/analog materials, and they are not related to this review: