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A high precision CMOS weak current readout circuit

Journal of Semiconductors 2009年第7期30卷 131-136页

作者：吴其松杨海钢尹韬张翀 Institute of Electronics Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences

This paper presents a high precision CMOS weak current readout *** circuit is capable of converting a weak current into a frequency signal for amperometric measurements with high precision and further delivering a 10-bit digital output.A fast stabilization-enhanced potentiostat has been proposed in the design, which is used to maintain a constant bias potential for amperometric biochemical sensors.A technique based on source voltage shifting that reduces the leakage current of the MOS transistor to the reverse diode leakage level at room temperature was employed in the *** chip was fabricated in the 0.35 μm chartered CMOS process, with a single 3.3 V power *** interface circuit maintains a dynamic range of more than 100 *** from 1 pA to 300 nA can be detected with a maximum nonlinearity of 0.3% over the full scale.

关键词： amperometric sensor current readout high precision potentiostat

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Performance of a plastic scintillation fiber dosimeter based on different photoelectric devices

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Nuclear Science and Techniques 2021年第11期32卷 25-31页

作者： Yue Yang Cui-Ping Yang Jie Xin Hai-Feng Chen Zhong-Xu Xing Wei-Wei Qu Liang Hu Xin-Jian Chen Ren-Sheng Wang State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China Renji Hospital Affiliated with the Shanghai Jiao Tong University School of MedicineShanghai 200127China Shanghai Ninth People’s Hospital Affiliated with the Shanghai Jiao Tong University School of MedicineShanghai 200127China Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Suzhou 215123China

The photoelectric device of a scintillation dosimeter converts photons produced by radiation into an electrical *** features directly determine the overall performance of the *** a plastic scintillation fiber dosimeter(PSFD)with a current readout mode,systematic studies of the stability and light-dose response were performed for the photomultiplier tube(PMT),silicon photomultiplier(SiPM),avalanche photodiode(APD),and photodiode(PD).The temperature stability,long-term stability,repeatability,signal-to-noise ratio(SNR),and current dose response of the PSFD with the abovementioned photoelectric devices were studied using a pulsed LED light source and the Small Animal Radiation Therapy *** exponential relationship between the dark/ne current and temperature was obtained for all the devices.I is shown that the APD is the most sensitive device to temperature,with a current dependence on temperature reaching 6.5%C^(-1)at room temperature,whereas for the other devices this dependence is alwayscurrent of PD can change by up to 4%when working continuously for 8 h and 2%when working intermittently for 32 h,whereas for the other devices,the changes are allcurrent readout mode,the performance of the PMT and SiPM is concluded to be better than that of the other devices in the *** particular,the SiPM,which has a compact size,low bias voltage,and antimagnetic interference,has great advantages for further applications.

关键词： Photoelectric device Plastic scintillation fiber dosimeter(PSFD) current readout Dose response

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