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A Novel Hybrid Continuous Time / Discrete Time Multi Stage Noise Shaping Structure Dedicated to MEMS Based Accelerometer

Author Affiliations

  • 1 Department of Electrical Engineering, Ahar branch, Islamic Azad University, Ahar, IRAN

Res. J. Recent Sci., Volume 4, Issue (2), Pages 48-54, February,2 (2015)

Abstract

A novel hybrid CT/DT delta sigma interface for micro electro mechanical accelerometer, which is located in the negative feedback, is presented in this article. The accelerometer with natural continuous time property is considered as the first stage of the modulator while a discrete time integrator is considered as the second stage of hybrid delta sigma to take the advantages of CT and DT delta sigma, simultaneously. The continuous time delta sigma modulator makes the use of inherent anti-aliasing filter and increased sampling frequency. While the discreet time delta sigma modulator benefits from the high accuracy of implementation. MATLAB simulation of the proposed hybrid delta sigma indicates the Signal to Noise plus Distortion Ratio (SNDR) of 114 dB over 1 KHz bandwidth when Over Sampling Ratio (OSR) is 256.

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