원문정보
초록
영어
Sigma-delta ACD has two main parts: analog modulator and digital filter, the performance of modulator determines the performance of sigma-delta ADC, so the design of modulator is very important. The paper introduces the principle of sigma-delta AD modulator with high accuracy and the applied over sampling technique, noise shaping technique and multi-bit quantizer technique. Determining the design scheme of modulator—three bits three orders CIFF(Cascade of integrators, feed forward form) structure, and it makes the behavior level verification for this scheme by Simulink tool in MATLAB. The simulation result shows that multi-bit quantizer modulator can get very high SNR, and based on this result it designs every part of the modulator circuit.
목차
1. Introduction
2. The Theoretical Foundation of Sigma-delta Modulator
2.1. The Basic Principle of Sigma-delta Modulator
2.2. The Key Technique of Sigma-Delta Modulator
3. Design of Multi-bit Quantization Sigma-delta Modulator
3.1. Sigma-delta Modulator Modeling
3.2. Sigma-delta Modulator Circuit Design
4. Simulation Experiment Result
5. Conclusion
References