A 16 Bits Sigma-Delta Modulator Applied in Gyroscope

Qiang Fu; Wei Ping Chen; Ying Kai Zhao; Liang Yin; Xiao Wei Liu

doi:10.4028/www.scientific.net/KEM.609-610.1077

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 609-610A 16 Bits Sigma-Delta Modulator Applied in...

A 16 Bits Sigma-Delta Modulator Applied in Gyroscope

Abstract:

In this paper, a 4^th-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 4^th-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.

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Periodical:

Key Engineering Materials (Volumes 609-610)

Pages:

1077-1081

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.609-610.1077

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Online since:

April 2014

Authors:

Qiang Fu*, Wei Ping Chen, Ying Kai Zhao, Liang Yin, Xiao Wei Liu

Keywords:

ADC, Gyroscope, Mash, Sigma-Delta

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* - Corresponding Author

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