Fernando Medeiro – författare

This text discusses architectural and circuit considerations for optimizing the design of oversampled A/D interfaces for mixed-signal CMOS ASICs. The mathematical background is presented and it is suitable for novices in the field. Practical recipes on how to get the maximum performance from these kinds of circuits are presented and illustrated through three converter prototypes in CMOS submicron technologies. A feature of this book is the presentation of a systematic methodology for increasing the productivity of engineers in the design of high-performance modulators. It uses optimization at the architecture and the circuit levels, together with hierarchical transmission of the specifications among levels. The tasks of architecture selection, architecture sizing and building block sizing are supported by CAD tools, thus allowing designers to obtain demanding modulator specifications in short design cycles. The book is organized such that it can be used for a graduate course on S modulator design. In addition, the book is a reference for designers who want to improve their productivity in the design of oversampled mixed-signal interfaces.

As the trend to system-on-chip solutions gradually consolidates, including an ever-increasing usage of digital signal processing, a concurrent enhancement of the analogue front-end performance is required. Moreover, such enhanced performances must be achieved under the constraints imposed by digitally driven technology roadmaps, with low-voltage supplies, poor-performance (and often badly characterized) devices - and above all the unavoidable presence of noisy digital circuits. It is under the pressure of these challenges that analogue designers must sharpen their wits to overcome the problems. Supported by both designers' ingenuity and slow, but precious, improvements of digital CMOS technologies, the results of recent research confirm that solutions can be found. In consonance with this trend, this text compiles up-to-date achievements regarding the design of high-speed and high-resolution data converters in deep submicron CMOS technologies. The four types of analogue-to-digital converter architectures commonly found in this arena are covered, namely sigma-delta, pipeline, folding/interpolating and flash.For all these types, latest achievements regarding the solution of critical architectural and circuital issues are presented, and illustrated through IC prototypes with measured state-of-the-art performances. Some of these prototypes are conceived to be employed at the chipset of newest generation wireline modems (ADSL and ADSL+). Others are intended for wireless transceivers. Besides analog-to-digital converters, the book also covers other functions needed for communication systems, such as digital-to-analog converters, analog filters, programmable gain amplifiers, digital filters, and line drivers. In addition to case studies on state-of-the-art converters, the book includes overview chapters aimed at presenting the existing knowledge in a structured, comprehensive style. Nyquist converters and sigma-delta converters are covered in such a way.

Top-Down Design of High-Performance Sigma-Delta Modulators discusses architectural and circuit considerations for optimizing the design of oversampled A/D interfaces for mixed-signal CMOS ASICs. The necessary mathematical background is presented in a detailed and comprehensive style, suitable for novices in the field. Practical recipes on how to get the maximum performance from these kinds of circuits are presented and illustrated through three converter prototypes in CMOS submicron technologies. A distinctive feature of this book is the presentation of a systematic methodology for increasing the productivity of engineers in the design of high-performance modulators. It uses optimization at the architecture and the circuit levels, together with hierarchical transmission of the specifications among levels. The major tasks of architecture selection, architecture sizing and building block sizing are supported by dedicated CAD tools, thus allowing designers to obtain demanding modulator specifications in short design cycles.Top-Down Design of High-Performance Sigma-Delta Modulators is organized such that it can be used for a graduate course on SigmaDelta modulator design. In addition, the book is a valuable reference for designers who want to improve their productivity in the design of oversampled mixed-signal interfaces.