Design of a Second-Order Sigma-Delta Modulator

Min Guo; Hong Hui Deng; Bo Wen Ding; Yong Sheng Yin

doi:10.4028/www.scientific.net/AMM.644-650.3797

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 644-650Design of a Second-Order Sigma-Delta Modulator

Design of a Second-Order Sigma-Delta Modulator

Abstract:

A second-order single bit Sigma - Delta modulator which can be applied to pressure sensor is designed in this paper.The modulator uses switched-capacitor circuit,and the operational amplifier adopts a differential folded-cascode structure with PMOS tube as input. Optimizes the coefficients at the system level design using Simulink tool. The schematic simulation and analysis is by the tools of Spectre and MATLAB with Global Foundry 0.35um CMOS technology. The modulator with oversampling rate of 256 is designed at the 3.3V power supply. Finally, this paper shows the circuit simulation results of the sigma-delta modulator whose signal-noise rate is 103.9dB and resolution is 16.97bits.

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Periodical:

Applied Mechanics and Materials (Volumes 644-650)

Pages:

3797-3801

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.644-650.3797

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Online since:

September 2014

Authors:

Min Guo, Hong Hui Deng, Bo Wen Ding, Yong Sheng Yin*

Keywords:

Differential Folded-Cascode Structure, Sigma-Delta Modulator, Switched-Capacitor Circuit

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* - Corresponding Author

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