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A novel SOI MOSFET electrostatic field sensor

Journal of Semiconductors 2010年第4期31卷 68-71页

作者：陈新安黄庆安 Key Laboratory of MEMS of Ministry of Education Southeast University

A novel low temperature solid state electric field sensor is demonstrated as a promising sensor. The sensor is a type of constant voltage Wheatstone bridge whose resistors are four direct gate SOl MOSFET devices. It is demonstrated in theory that the output voltage signal is proportional to the electric field E, the temperature drift is about zero when the temperature is in the range from 200 to 400 K, and the doping concentration is in the range from 1 × 10^14 to 1 × 10^16 cm^-3. The experiment results indicate that the resolution of the sensor is about 3.27 mV for a 1000 V/m electric field at 300 K, and the voltage drift by an amount is about 47 V/m field signal when the degree temperature is in the range from 300 to 370 K, which is much smaller than the current drift of a single MOSFET which is about 10000 V/m field signal.

关键词： electrostatic field sensor low temperature drift Wheatstone bridge

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A precision ADC sampling system design

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Radiation Detection Technology and Methods 2020年第2期4卷 182-189页

作者： Peng Liu Fengli Long Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Introduction The high-energy photon source,which has been built in Huairou,Beijing,has high requirements on magnetic field *** field dithering is mainly determined by the stability of the output current of the power *** order to ensure the stability of the output current of quadrupole magnet power supply,the power supply sampling control loop needs to be precisely *** this paper,a precision ADC sampling system based on internal temperature control is designed to carry out precise control of the sampling *** In this design,precise ADC chip is used to complete the precise sampling of the *** precise sampling system contains a DAC system for high-speed *** In order to verify the design of the system,high-precision quadrupolemagnet power supply is used for *** The experimental results show that the temperature variation range of precision temperature control ADC system is±0.1°*** using the precise temperature controlADCsystem,the output current stability of the high-precision quadrupole magnet power supply is effectively improved.

关键词： HEPS Precision ADC Precision temperature control Full-digital control low temperature drift

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Design and Realization of a New Type of Constant Current Source with Small Current and High Precision 36

Design and Realization of a New Type of Constant Current Sou...

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第36届中国控制会议

作者： Jun xiao Li Xue mei Wang Zhe Xu Xi’an High Tech Research Institute

ISBN: (纸本)9781538629185

Using constant current source as the excitation signal is an effective method for system testing of the *** present,the constant current source circuit built by TL431 voltage regulator does not meet the system test requirements of the aircraft under the condition of small current *** when the temperature span is large,the working circuit does not have the ability to inhibit the temperature drift,of which the temperature drift is *** this paper,the constant current source circuit built by TL431 voltage regulator is *** OP77 and π-type filter circuit to ensure the output accuracy,the design of the resistor network can achieve complementary temperature *** drift is reduced by adjusting the appropriate compensation ***,the superior performance of the improved constant current source is verified by simulation and experiment.

关键词： Small current High precision low temperature drift Constant current source

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