A Fourth-Order, Audio-Bandwidth, 87.5-dB SNDR ΣΔ Modulator for MEMS Microphones

被引：0

作者：

Picolli, L. ^{[1
]}

Grassi, M. ^{[1
]}

Rosson, L. ^{[1
]}

Fornasari, A. ^{[1
]}

Malcovati, P. ^{[1
]}

机构：

[1] Univ Pavia, Dept Elect Engn, I-27100 Pavia, Italy

来源：

ISCAS: 2009 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-5 | 2009年

关键词：

D O I：

10.1109/ISCAS.2009.5118008

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper presents a complete interface circuit for capacitive MEMS microphones, consisting of the cascade of a preamplifier, a second-order, multi-bit analog Sigma Delta modulator, and a fourth-order, single-bit digital Sigma Delta modulator. The complete interface circuit features a current consumption of 574 mu A from a 3.3-V power supply, achieving a signal-to-noise and distortion ratio (SNDR) of 87.5 dB. The feed-forward technique has been used in the analog Sigma Delta modulator, to relax the requirements of the operational amplifiers. The proposed MEMS microphone interface circuit is designed in a 0.35-mu m CMOS technology. Post-layout and Montecarlo simulation results of the overall circuit are reported to validate the performance.

引用

页码：1325 / 1328

页数：4

共 34 条

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