xii PREFACE
found extensive use in industry and classrooms worldwide. Of course, technology advances
and methodologies mature, making it clear that the first edition needed revision.
The second edition resulted from a unique blending of industry and academia. Between
the period of the first and second editions (15 years), over 50 short courses were taught from
the first edition to over 1500 engineers worldwide. In these short courses, the engineers
demanded to understand the concepts and insights to designing analog CMOS circuits, and
many of the responses to those demands were included in the second edition. In addition to
the industrial input to the second edition, the authors have taught this material at Georgia
Institute of Technology and the University of Texas at Austin. This experience provided
insight that was included in the second edition from the viewpoint of students and their ques-
tions. Moreover, the academic application of this material has resulted in a large body of new
problems that were given as tests and included in the second edition.
Third Edition
The third edition has focused on cleaning up the material and removing that which is not used.
Homework problems that were not effective have been removed and replaced by better prob-
lems. This edition has introduced the idea of design problems. These problems give the
desired specifications and a score for grading the problem. The reader is to do the design by
hand and then use the computer to simulate the performance and extract the score. These are
great vehicles for teaching the trade-off of optimizing the score versus the time spent. Also in
this edition, answers to selected problems are found at the back of the book.
Key changes to the third edition are as follows.
• The technology in Chapter 2 has been updated and a new appendix created to give
details on layout (Appendix B).
• In Chapter 3 the large-signal MOS model has been extended to include velocity
saturation.
• In Chapter 4, the bandgap section has been updated and completely rewritten.
• The cascode op amps in Chapter 6 have been updated and the enhanced-gain technique
used to create op amps with ultra large voltage gains.
• In Chapter 7, the differential-in, differential-out op amps have been updated and the
material on output common-mode feedback expanded.
• Chapter 9, on switched capacitor circuits, was removed and condensed into Appendix E.
• A design illustration was presented in Section 10.5 to show the steps in designing an
open-loop, buffered, sample-and-hold circuit.
• Also included in Chapter 9 at the conclusion is the website to an Excel spreadsheet that
has all published ADC converters from 1997 through 2010. This information is
extremely useful for understanding the trends in converters.
• Design problems have been introduced. These problems give the desired specifications
and a score for grading the problem. The reader is to do the design by hand and then
use the computer to simulate the performance and extract the score. These are great
vehicles for teaching the trade-off of optimizing the score versus the time spent.
• Readers of the previous editions have requested answers to the problems. In this edi-
tion, answers to selected problems are found at the back of the book.
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xiedangui2019-04-09很好，很清晰
