Design of Low Power and Low Area Passive SIGMA Delta Modulators for Audio Applications

ISBN-13: 9783319570327 / Angielski / Miękka / 2017 / 78 str.

David Fouto; Nuno Paulino

Opis

This book presents the study, design, modulation, optimization and implementation of low power, passive DT-ΣΔMs for use in audio applications. The high gain and bandwidth amplifier normally used for integration in ΣΔ modulation, is replaced by passive, switched-capacitor branches working under the Ultra Incomplete Settling (UIS) condition, leading to a reduction of the consumed power. The authors describe a design process that uses high level models and an optimization process based in genetic algorithms to achieve the desired performance.

Spis treści

1 Introduction

1.1 Motivation and Background

1.2 Book Organization

2 Sigma-Delta Modulation

2.1 Introduction

2.2 First Order Sigma-Delta Modulator

2.3 Second Order Sigma-Delta Modulator

2.4 Higher Order Sigma-Delta Modulator

2.4.1 The MASH Structure

3 Architecture and High Level Model

3.1 Passive Integrator

3.1.1 Ultra Incomplete Settling

3.1.2 Discrete Time Transfer Function of the SC Integrator

3.1.3 Thermal Noise Analysis

3.2 Modulator Block Diagram

3.2.1 Signal and Noise Transfer Functions

3.3 Proposed Architecture

3.4 High Level Model

3.5 Optimization

3.6 Reducing the Size of the Capacitors

4 Electrical Circuits and Simulation Results

4.1 Introduction

4.2 Digital Circuitry

4.2.1 Logic Gates

4.2.2 Delay Circuits

4.2.3 Phase Generator

4.2.4 Flip-Flop

4.3 Amplifiers

4.3.1 Gain G2

4.3.2 Gain Gmid

4.4 Comparator

4.5 Switching Circuitry

4.5.1 Clock Bootstrapped Switch

4.6 Feedback and Reference Voltages

4.7 Monostable Circuit

4.8 Simulation Results

4.8.1 Second Order ΣΔ Modulator

4.8.2 Third Order MASH ΣΔ Modulator

4.8.3 Third Order MASH ΣΔM with Monostable Circuit

5 Conclusions

5.1 Final Remarks

References

O autorze

David Fouto is a researcher in the Department of Electrical Engineering, Faculdade de Ciências e Tecnologia of the Universidade Nova de Lisboa, Portugal.

Nuno Paulino is a Professor in the Department of Electrical Engineering, Faculdade de Ciências e Tecnologia of the Universidade Nova de Lisboa, Portugal.