Design of High-SNR CMOS Interface Circuit for Micro-Machined Gyroscope

Abstract:

A CMOS integrated interface circuit for micro-machined gyroscope containing a novel front-end and 6th-order Sigma-delta modulator is presented in this paper. To reduce the noise coming from the sensor and circuit, the front-end is accomplished by a switched-capacitor architecture, which constructed by a high-gain fully-differential amplifier and improved by chopper-stabilization technique, and work under a designed charging and sampling logic scheme. A cascade 6th-order Sigma-Delta modulator is designed to get high resolution, reduce quantized error and suppress the instability brought by high-order modulator. With the cascade structure and 16-bit resolution 32 OSR, the modulator outputs 3-bits digital stream. The whole circuit is designed with AMS technique and 3.3V power consumption. The simulation result presents that the interface circuit performs a appointed under a low-noise design specification in signal band, and the SNR of the circuit achieves remarkable value of 106dB.

• Periodical: Key Engineering Materials (Volume 483)
• Pages: 508-512
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.483.508
• Online since: June 2011
• Authors: Hai Xi Lu, Yong Ping Xu, Shou Rong Wang
• Keywords: Front-End, Gyroscope, Interface, Sigma-Delta Modulator (SDM)

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