Yacong Zhang

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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 mainly discusses issues concerning the architecture of time divided closed loop accelerometer. For this particular architecture mathematical relationship between the external acceleration detected by sensor and the voltage output of the readout circuits is deduced. Both Matlab/Simulink model and Verilog-A model for such architecture are(More)
This paper presents a digital dimming control circuit used in a light-emitting diode (LED) driver, allowing it to dim multiple LED strings with only two input ports which receive serial data accompanied with synchronous clock. A multiplexing technique is used to simplify the control circuit, using one DAC to transfer all the dimming messages for each(More)
The paper describes a pulse signal acquisition ASIC intended for MEMS switch, which operates at 1.5V and consumes only 0.296μW that fully satisfies the requirement of working for at least 10 years with the supply of button cell. RC oscillator optimized for low power was developed and used in clock generator. Pulse width regulation module acquiring(More)