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In this study, twenty-four core sediment samples were collected from monitoring stations in the East China Sea (ECS) to investigate the spatial and temporal distributions of polybrominated diphenyl ethers (PBDEs) and their potential sources. In surface sediment samples (the top 0-3 cm segment), the concentrations of Σ8PBDEs (sum of BDE15, 28, 47, 99, 100,(More)
In this paper, a control and readout circuit for MEMS vibratory gyroscope is described, including closed- loop driving axis and open-loop sensing axis. Capacitive mismatch auto-compensation has been implemented in this system to suppress the influence to the output due to the mismatch of gyroscope capacitors. The ASIC is fabricated in a 0.35um CMOS process.(More)
The paper presents a closed-loop system scheme with DC sensing method for vibratory gyroscopes. A DC sensing method is employed to convert the amplitude-modulated capacitive signal to voltage. The system realizes a closed-loop control in the driving mode. A high voltage (HV) drive signal which is compatible with the gyro is obtained by the on-chip level(More)
This paper presents a low-noise SC-type interface ASIC for a closed-loop MEMS vibratory gyroscope. An AC sensing method is employed to convert the amplitude-modulated capacitive signal to voltage signal. The interface CSA (charge sensitive amplifier) is followed by a CDS (correlated double sampling) circuit to reduce low frequency noise and eliminate(More)
In this paper, a micromachined gyroscope system composed of a vibratory gyroscope with its interface ASIC is presented. The system adopts a DC sensing method to detect the capacitive motion, which is insensitive to the mismatch of the gyroscope capacitors and can eliminate high frequency signals from the chip. Therefore it offers a commendable noise(More)
A highly efficient approach to improve PSRR behavior of Kuijk BGR topology is derived though small signal transfer function analysis and, a BGR circuit has been designed and fabricated on standard 0.5μm CMOS technology to verify this method. This thought greatly relieves the trade-offs of BGR circuit design among power consumption, PSRR performance,(More)