Oversampling techniques based on sigma-delta modulation are  widely used to implement the analog/digital interfaces in CMOS VLSI  technologies. This approach is relatively insensitive to imperfections  in the manufacturing process and offers numerous advantages for the  realization of high-resolution analog-to-digital (A/D) converters in  the low-voltage environment that is increasingly demanded by advanced  VLSI technologies and by portable electronic systems. In The Design  of Low-Voltage, Low-Power Sigma-Delta Modulators, an analysis  of power dissipation in sigma-delta modulators is presented, and a  low-voltage implementation of a digital-audio performance A/D  converter based on the results of this analysis is described.     Although significant power savings can typically be achieved in  digital circuits by reducing the power supply voltage, the power  dissipation in analog circuits actually tends to increase with  decreasing supply voltages. Oversampling architectures are a  potentially power-efficient means of implementing high-resolution A/D  converters because they reduce the number and complexity of the analog  circuits in comparison with Nyquist-rate converters. In fact, it is  shown that the power dissipation of a sigma-delta modulator can  approach that of a single integrator with the resolution and bandwidth  required for a given application. In this research the influence of  various parameters on the power dissipation of the modulator has been  evaluated and strategies for the design of a power-efficient  implementation have been identified.     The Design of Low-Voltage, Low-Power Sigma-Delta Modulators  begins with an overview of A/D conversion, emphasizing sigma-delta  modulators. It includes a detailed analysis of noise in sigma-delta  modulators, analyzes power dissipation in integrator circuits, and  addresses practical issues in the circuit design and testing of a  high-resolution modulator.     The Design of Low-Voltage, Low-Power Sigma-Delta Modulators will  be of interest to practicing engineers and researchers in the areas of  mixed-signal and analog integrated circuit design.

The Design of Low-Voltage, Low-Power Sigma-Delta Modulators (The Springer International Series in Engineering and Computer Science) PDF

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