In this study,a compact 16-channel integrated charge-sensitive preamplifier named the smart preamplifier(SPA)was developed to support the large-scale detector array used in modern nuclear physics experiments.Two types...In this study,a compact 16-channel integrated charge-sensitive preamplifier named the smart preamplifier(SPA)was developed to support the large-scale detector array used in modern nuclear physics experiments.Two types of SPA,namely SPA02 and SPA03(with external field effect transistor),have been manufactured to match silicon detectors with small and large capacitances,respectively.The characteristics of the SPA include fast response of typically less than 6 ns for pulse rising time and low equivalent noise of 1.5 keV at zero input capacitance.The energy sensitivity and pulse decay time can be easily adjusted by changing the feedback capacitance Cfand resistance Rfin various applications.A good energy resolution of 24.4 keV for 5.803-MeV alpha particles from 244 Cm was achieved using a small-sized Si-PIN detector;for the silicon strip detectors in the test with the alpha source,a typical energy resolution of 0.6–0.8%was achieved.The integrated SPA has been employed in several experiments of silicon strip detectors with hundreds of channels,and a good performance has been realized.展开更多
High precision time measurement is required in the readout of the neutron wall and TOF walls in the external target experiment of the Cooling Storage Ring(CSR) project in the Heavy Ion Research Facility in Lanzhou(HIR...High precision time measurement is required in the readout of the neutron wall and TOF walls in the external target experiment of the Cooling Storage Ring(CSR) project in the Heavy Ion Research Facility in Lanzhou(HIRFL).Considering the time walk correction,both time and charge are measured in the readout electronics.In this 16-channel measurement module,time and charge information are digitized by TDCs at the same time based on the Time-Over-Threshold(TOT) method;meanwhile,by employing high-density ASIC chips,the electronics complexity is effectively reduced.Test results indicate that this module achieves a time resolution better than 25 ps and a charge resolution better than 5%over the input amplitude range from 50 mV to 3V.展开更多
A 16-channel gated integrator(GI) module following semi-Gaussian shaping amplifiers was developed for high-resolution energy spectroscopy systems at Institute of Modern Physics,Chinese Academy of Sciences.This GI solv...A 16-channel gated integrator(GI) module following semi-Gaussian shaping amplifiers was developed for high-resolution energy spectroscopy systems at Institute of Modern Physics,Chinese Academy of Sciences.This GI solved the ballistic deficit problem by integrating the signal until all the charge was collected from the detector at counting rates up to 100 K.In this paper,a fast shaper was used to optimize the gate logic to ensure nonlinearity of the GI less than 0.17%;and a novel compensation approach,to reduce the charge injection from the switches in the GI; and a T-switch configuration,to eliminate leakage current in the reset switch.展开更多
A CMOS front-end integrated circuit consisting of 16 identical analog channels is proposed for semiconductor radiation detectors. Each of the 16 channels has a low noise charge sensitive amplifier, a pulse shaper, a p...A CMOS front-end integrated circuit consisting of 16 identical analog channels is proposed for semiconductor radiation detectors. Each of the 16 channels has a low noise charge sensitive amplifier, a pulse shaper, a peak detect and hold circuit and a discriminator, while analog voltage and channel address are routed off the chip. It can accommodate both electron and hole collection with selectable gain and peaking time. Sequential and sparse readout, combining with self-trigger and external trigger, makes four readout modes. The circuit is implemented in a 0.35 μm DP4M (double-poly-quad-metal) CMOS technology with an area of 2.5×1.54 mm2 and power dissipation of 60 mW. A single channel chip is tested with Verigy 93000. The gain is adjustable from 13 to 130 mV·fC–1 while the peaking time varies between 0.7 and 1.6 μs. The linearity is more than 99% and the equivalent noise charge is about 600e.展开更多
目的探讨血清甲壳质酶蛋白40(chitinase protein 40,YKL-40)、Clara细胞蛋白16(Clara cell protein 16,CC16)对急性阑尾炎(acute appendicitis,AA)患儿手术切口感染的预测价值。方法河北北方学院附属第一医院小儿外科2021年10月至2023...目的探讨血清甲壳质酶蛋白40(chitinase protein 40,YKL-40)、Clara细胞蛋白16(Clara cell protein 16,CC16)对急性阑尾炎(acute appendicitis,AA)患儿手术切口感染的预测价值。方法河北北方学院附属第一医院小儿外科2021年10月至2023年10月收治的324例行腹腔镜手术的AA患儿,根据患儿腹腔镜手术30 d后的切口感染情况分为感染组(n=40)和未感染者组(n=284),ELISA测定血清YKL-40、CC16水平,多因素Logistic回归分析影响AA患儿发生手术切口感染的因素;采用受试者工作特征(ROC)曲线分析血清YKL-40、CC16对AA患儿发生手术切口感染的预测价值,Pearson法分析发生切口感染的AA患者血清YKL-40、CC16水平的相关性。结果感染组和未感染组患儿的身高、合并阑尾穿孔、体重、切口长度、腹腔引流管留置、切口探查、性别、年龄、疾病持续时间、白细胞计数、术前体温及术中出血量情况比较,差异无统计学意义(P>0.05);感染组较非感染组手术操作时间≥1 h的患儿比例及血清YKL-40水平增加,血清CC16水平降低(P<0.05);YKL-40是AA患儿发生手术切口感染的危险因素,CC16是保护因素(P<0.05);血清YKL-40、CC16及联合预测AA患儿发生手术切口感染的AUC为0.805、0.833、0.899,二者联合优于单独预测价值(Z=3.372、2.032,P=0.001、0.042);感染组患儿血清YKL-40、CC16水平呈负相关(r=-0.730,P<0.001)。结论AA患儿手术切口感染者较未感染者血清YKL-40水平升高、CC16水平降低,二者对AA患儿发生手术切口感染具有一定的预测价值。展开更多
基金supported by the National Key R&D Program of China(No.2018YFA0404404)the National Natural Science Foundation of China(Nos.11635015,U1732145,11705285,11805280,U1867212,and 11961131012)the Continuous Basic Scientific Research Project(No.WDJC-2019-13).
文摘In this study,a compact 16-channel integrated charge-sensitive preamplifier named the smart preamplifier(SPA)was developed to support the large-scale detector array used in modern nuclear physics experiments.Two types of SPA,namely SPA02 and SPA03(with external field effect transistor),have been manufactured to match silicon detectors with small and large capacitances,respectively.The characteristics of the SPA include fast response of typically less than 6 ns for pulse rising time and low equivalent noise of 1.5 keV at zero input capacitance.The energy sensitivity and pulse decay time can be easily adjusted by changing the feedback capacitance Cfand resistance Rfin various applications.A good energy resolution of 24.4 keV for 5.803-MeV alpha particles from 244 Cm was achieved using a small-sized Si-PIN detector;for the silicon strip detectors in the test with the alpha source,a typical energy resolution of 0.6–0.8%was achieved.The integrated SPA has been employed in several experiments of silicon strip detectors with hundreds of channels,and a good performance has been realized.
基金Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KJCX2-YW-N27)the National Natural Science Foundation of China(No.11079003)
文摘High precision time measurement is required in the readout of the neutron wall and TOF walls in the external target experiment of the Cooling Storage Ring(CSR) project in the Heavy Ion Research Facility in Lanzhou(HIRFL).Considering the time walk correction,both time and charge are measured in the readout electronics.In this 16-channel measurement module,time and charge information are digitized by TDCs at the same time based on the Time-Over-Threshold(TOT) method;meanwhile,by employing high-density ASIC chips,the electronics complexity is effectively reduced.Test results indicate that this module achieves a time resolution better than 25 ps and a charge resolution better than 5%over the input amplitude range from 50 mV to 3V.
基金Supported by the Important Direction Project of the CAS Knowledge Innovation Program(No.KJCX2-YW-N27)the National Natural Science Foundation of China(No.11005135)
文摘A 16-channel gated integrator(GI) module following semi-Gaussian shaping amplifiers was developed for high-resolution energy spectroscopy systems at Institute of Modern Physics,Chinese Academy of Sciences.This GI solved the ballistic deficit problem by integrating the signal until all the charge was collected from the detector at counting rates up to 100 K.In this paper,a fast shaper was used to optimize the gate logic to ensure nonlinearity of the GI less than 0.17%;and a novel compensation approach,to reduce the charge injection from the switches in the GI; and a T-switch configuration,to eliminate leakage current in the reset switch.
基金Supported by the National Natural Science Foundation of China (No.40704025)
文摘A CMOS front-end integrated circuit consisting of 16 identical analog channels is proposed for semiconductor radiation detectors. Each of the 16 channels has a low noise charge sensitive amplifier, a pulse shaper, a peak detect and hold circuit and a discriminator, while analog voltage and channel address are routed off the chip. It can accommodate both electron and hole collection with selectable gain and peaking time. Sequential and sparse readout, combining with self-trigger and external trigger, makes four readout modes. The circuit is implemented in a 0.35 μm DP4M (double-poly-quad-metal) CMOS technology with an area of 2.5×1.54 mm2 and power dissipation of 60 mW. A single channel chip is tested with Verigy 93000. The gain is adjustable from 13 to 130 mV·fC–1 while the peaking time varies between 0.7 and 1.6 μs. The linearity is more than 99% and the equivalent noise charge is about 600e.
文摘目的探讨血清甲壳质酶蛋白40(chitinase protein 40,YKL-40)、Clara细胞蛋白16(Clara cell protein 16,CC16)对急性阑尾炎(acute appendicitis,AA)患儿手术切口感染的预测价值。方法河北北方学院附属第一医院小儿外科2021年10月至2023年10月收治的324例行腹腔镜手术的AA患儿,根据患儿腹腔镜手术30 d后的切口感染情况分为感染组(n=40)和未感染者组(n=284),ELISA测定血清YKL-40、CC16水平,多因素Logistic回归分析影响AA患儿发生手术切口感染的因素;采用受试者工作特征(ROC)曲线分析血清YKL-40、CC16对AA患儿发生手术切口感染的预测价值,Pearson法分析发生切口感染的AA患者血清YKL-40、CC16水平的相关性。结果感染组和未感染组患儿的身高、合并阑尾穿孔、体重、切口长度、腹腔引流管留置、切口探查、性别、年龄、疾病持续时间、白细胞计数、术前体温及术中出血量情况比较,差异无统计学意义(P>0.05);感染组较非感染组手术操作时间≥1 h的患儿比例及血清YKL-40水平增加,血清CC16水平降低(P<0.05);YKL-40是AA患儿发生手术切口感染的危险因素,CC16是保护因素(P<0.05);血清YKL-40、CC16及联合预测AA患儿发生手术切口感染的AUC为0.805、0.833、0.899,二者联合优于单独预测价值(Z=3.372、2.032,P=0.001、0.042);感染组患儿血清YKL-40、CC16水平呈负相关(r=-0.730,P<0.001)。结论AA患儿手术切口感染者较未感染者血清YKL-40水平升高、CC16水平降低,二者对AA患儿发生手术切口感染具有一定的预测价值。
