Design with Operational Amplifiers and Analog Integrated Circuits 4th Edition by Sergio Franco.
Preface to Design with Analog Integrated Circuits
During the last decades, much has been prophesized that there will be little need for analog circuitry in the future because digital electronics are taking over.
Far from having proven true, this contention has provoked controversial rebuttals, as epitomized by statements such as “If you cannot do it in digital, it’s got to be done in analog.”
Add to this the common misconception that analog design, compared to digital design, seems to be more of a whimsical art than a systematic science, and what is the confused student to make of this controversy?
Is it worth pursuing some coursework in analog electronics, or is it better to focus just on digital? There is no doubt that many functions that were traditionally the domain of analog electronics are nowadays implemented in digital form, a popular example being offered by digital audio.
Here, the analog signals produced by microphones and other acoustic transducers are suitably conditioned by means of amplifiers and filters and are then converted to digital form for further processing,
such as mixing, editing, and the creation of special effects, as well as for the more mundane but no less important tasks of transmission, storage, and retrieval.
Finally, digital information is converted back to analog signals for playing through loudspeakers. One of the main reasons why it is desirable to perform as many functions as possible digitally is the generally superior reliability and flexibility of digital circuitry.
However, the physical world is inherently analog, indicating that there will always be a need for analog circuitry to condition physical signals such as those associated with transducers, as well as to convert information from analog to digital for processing, and from digital back to analog for reuse in the physical world.
Moreover, new applications continue to emerge, where considerations of speed and power make it more advantageous to use analog front ends; wireless communications provide a good example.
Indeed many applications today are best addressed by mixed-mode integrated circuits (mixed-mode ICs) and systems, which rely on analog circuitry to interface with the physical world and digital circuitry for processing and control.
Even though the analog circuitry may constitute only a small portion of the total chip area, it is often the most challenging part to design as well as the limiting factor on the performance of the entire system.
In this respect, it is usually the analog designer who is called to devise ingenious solutions to the task of realizing analog functions in decidedly digital technologies; switched-capacitor techniques in filtering and sigma-delta techniques in data conversion are popular examples.
In light of the above, the need for competent analog designers will continue to remain very strong. Even purely digital circuits, when pushed to their operational limits, exhibit analog behavior.
Consequently, a solid grasp of analog design principles and techniques is a valuable asset in the design of any IC, not just purely digital or purely analog ICs.
Author of Integrated Circuits
Sergio Franco was born in Friuli, Italy, and earned his Ph.D. from the University of Illinois at Urbana-Champaign. After working in the industry, both in the United States and Italy.
He joined San Francisco State University in 1980, where he has contributed to the formation of many hundreds of successful analog engineers gainfully employed in Silicon Valley.
Dr. Franco is the author of the textbook Analog Circuit Design—Discrete & Integrated, also by McGraw-Hill. More information can be found on the author’s website at http://online.sfsu.edu/sfranco/.
Design with Analog Integrated Circuits Contents
- Operational Amplifier Fundamentals
- Circuits with Resistive Feedback
- Active Filters: Part I
- Active Filters: Part II
- Static Op-Amp Limitations
- Dynamic Op-Amp Limitations
- Nonlinear Circuits
- Signal Generators
- Voltage References and Regulators
- D-A and A-D Converters
- Nonlinear Amplifiers and Phase-Locked Loops
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