A 16 bits sigma-delta modulator applied in gyroscope

被引：0
|
作者：
Fu Qiang [1 ]
Chen Weiping [1 ]
Zhao Yingkai [1 ]
Yin Liang [1 ]
Liu Xiaowei [1 ]
机构：
[1] Harbin Inst Technol, MEMS Ctr, Harbin 150006, Heilongjiang, Peoples R China
来源：
MICRO-NANO TECHNOLOGY XV | 2014年 / 609-610卷
关键词：
MASH sigma-delta ADC gyroscope;
D O I：
10.4028/www.scientific.net/KEM.609-610.1077
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this paper, a 4th-order sigma-delta modulator applied in gyroscope is presented. This modulator adopts the 2-1-1 Multi stage noise shaping structure. The bandwidth of signal is 100 KHz, the over sample rate is 64, and sample frequency is 12.8MHz. By the MATLAB Simulink modeling and simulation, when the input signal is 100 KHz, the SNDR of the MASH ADC is 121.8dB, and the effective number of bit is 19.93 in ideal situation. After considering non-ideal factors, the SNDR is 111.6dB, the effective number of bit of ADC is 18.28. Compared with the ideal situation, the noise floor of PSD has increased 40dB. It explains that non-ideal factors have a significant effect on the performance of the sigma-delta ADC. The 4th-order MASH sigma-delta modulator has been implemented under 0.5 um CMOS process and simulated under Cadence. The final simulation results show that SNDR is 112.4 dB and effective number of bits (ENOB) is 18.6.
引用
收藏
页码：1077 / 1081
页数：5
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