This is essentially a companion to an earlier book focusing primarily on digital circuit design, which was co-authored by Baker [1]. This book consists of seven chapters that focus on the circuit design, simulation, and layout issues of mixed-signal circuits. Each chapter presents different aspects of mixed-signal circuits, using an abundance of relevant circuit examples, SPICE simulations, and occasional issues related to layouts.

Continuing from the previous volume, the book begins with chapter 30, which presents fundamental issues in mixed signal modeling, using data converters as an example. Simple SPICE models of analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) are presented. Quantization noise in data conversion is discussed, and sample simulations are used to illustrate this phenomenon. Finally, techniques to reduce quantization noise are reviewed.

Chapter 31 covers signal to noise ratio (SNR) in data converters. Clock jitter, spectral density, and the number of bits needed to represent digital signals are presented in the context of SNR theory. Theories to improve data converter SNR, such as averaging, noise shaping, and using feedback circuits, are presented.

Noise shaping data converter implementations are the primary focus of the next chapter. SPICE behavioral models are used to model first- and second-order noise shaping modulators. This method is extended to multi-order and cascaded modulators. There is a great deal of discussion regarding the theory of noise shaping data conversion, and the use of ideal and MOSFET-based simulations with SPICE in their implementations.

Chapter 33 brings in submicron CMOS design issues. First, the SPICE models that capture the behavior of sub-micron MOS transistors, resistors, and capacitors are presented. Issues related to layout of these components, as related to the matching of devices, are presented using a number of examples. Digital circuit analysis is considered, with a focus on switch operations. Some relevant digital circuits used in mixed-signal applications are presented. This is followed by a section on deep sub-micron issues within analog circuits. Design issues in active current source and operational amplifiers are presented, along with the consideration of noise in submicron MOS transistors.

Chapter 34 presents issues related to actual circuit implementation of DAC and ADC circuits at the transistor level. R-2R topology is used in the analysis and design of DAC. Circuit topologies with and without the use of operational amplifiers are considered. A number of implementations of ADCs were considered. Finally, layout issues that are critical to the performance of data converters are discussed.

Although ADCs and DACs are used to convert between the analog and digital signal domains, filters are also important in mixed-signal circuits. Filters are used for anti-aliasing and signal reconstruction. Chapter 35 begins with introductory concepts for simple filter circuits, and culminates with the circuit topologies for bilinear, biquadratic transformations.

Finally, chapter 35 presents some practical considerations needed in simulation and measurement of mixed signal circuits. This is very useful for students starting to work in the laboratory, as this information is not typically seen in textbooks.

In recent years there has been tremendous growth in the applications of mixed-signal circuits. However, there has not been a good textbook that presents the issues related to the design of these circuits. Baker presents an excellent introduction to the theory of mixed-signal circuit design and techniques needed for practical implementation of circuits. This is a well thought out presentation of mixed signal circuits. SPICE simulation netlists are available from the companion Web site.

One significant topic missing from the book is that of analog hardware description languages (HDLs). Analog HDLs, such as Verilog-AMS, are being used to model mixed-signal circuits at the behavioral level. SPICE simulation using ideal device models are used in the book to speed up the simulation. A chapter on analog HDLs would have provided a more comprehensive modeling scheme for mixed-signal designers.

I would highly recommend this as a textbook in mixed-signal circuit design for senior-level or introductory graduate-level courses. The book will also be very useful for digital design engineers who would like more knowledge of analog or mixed-signal interfaces.