A study of fourth-order sigma-delta modulator using RC-filter

被引：0
|
作者：
Hasegawa, Daisuke [1 ]
Inagaki, Yuji [1 ]
Matsuya, Yasuyuki [1 ]
机构：
[1] Electrical Engineering and Electronics Course, Graduate School of Science and Engineering, Aoyama Gakuin University, 5-10-1, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa,252-5258, Japan
来源：
IEEJ Transactions on Electronics, Information and Systems | 2019年 / 139卷 / 04期
关键词：
Amplifiers (electronic) - Delta sigma modulation - Light amplifiers - Microphones - Modulators;
D O I：
10.1541/ieejeiss.139.486
中图分类号：
学科分类号：
摘要：
Spreading portable devices widely, the small MEMS on-board microphone IC is paid attention. The small and high-accurate sigma-delta modulator is used for the MEMS on-board microphone IC. The sigma-delta modulator must use amplifiers for the integrator. Due to using the integrators for high order noise-shaping characteristic, its power consumption increases. We proposed changing amplifiers to filters and confirmed 100dB of S/N+THD in the 20kHz audio band. ©.
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页码：486 / 491
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