共查询到20条相似文献,搜索用时 562 毫秒
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用于巨磁阻生物传感器检测的模拟前端电路 总被引:1,自引:0,他引:1
提出一种用于巨磁阻(GMR)生物传感器检测的模拟前端电路。电路采用电压检测的方法,包括基准电压源,单位增益缓冲器,电荷转移型开关电容采样保持电路,流水线模数转换器四部分;基准电压源用于产生传感器阵列的片内激励电压;传感器阵列的检测输出电压经单位增益缓冲器后,由开关电容采样保持电路进行采样,保持,放大;最后经过流水线模数转换器输出数字码流;芯片采用SMIC 0.18μm 1P6M CMOS厚栅氧工艺实现。测试结果表明,在电源电压3.3 V,20 MHz时钟下测试,整体电路输出信号有效精度达到7.2 bit,功耗33 mW,满足GMR生物传感器的检测要求。 相似文献
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本文提出了用双层多晶CMOS工艺来设计和制造湿度控制的多级振荡器.为电路所集成的一部分的温度传感头其结构为叉指状多晶硅电容结构.通过对标准版图的适当调整,便可实现传感器与CMOS工艺的兼容. 相似文献
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Kh. S. Karimov M. Saleem M. Mahroof-Tahir R. Akram M. T. Saeed Chanee A. K. Niaz 《半导体学报》2014,35(9):094001-4
A resistive-type relative humidity (RH) sensor based on vanadium complex (VO2(3-f[)) film is reported in this study. Gold electrodes were deposited on the glass substrates in a co-planar structure. A thin film of vanadium complex was coated as a humidity-sensing material on the top of the pre-patterned electrodes. The humidity-sensing principle of the sensor was based on the conductivity change of coated sensing element upon adsorption/desorption of water vapor. The resistance of the humidity sensor measured at 1 kHz decreased linearly with increasing the humidity in the range of 35%-70% RH. The overall resistance of the sensor decreases 11 times. An equivalent circuit for the VO2(3-fl) based resistive-type humidity sensor was developed. The properties of the sensor studied in this work make it beneficial for use in the instruments for environmental monitoring of humidity. 相似文献
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A high-speed capacitive humidity sensor with on-chip thermal reset 总被引:10,自引:0,他引:10
This paper reports a high-speed capacitive humidity sensor integrated on a polysilicon heater. A response time of 1.0 s and a sensitivity of 30.0 fF/%RH have been obtained. High speed is achieved using multiple polyimide columns having diameters of a few microns and allowing moisture to diffuse into them circumferentially. Using structures that eliminate the air-gap capacitance between the columns, the simulated sensor output drifts by only 1% when the relative dielectric constant in the air region changes from 1 to 10. A polysilicon heater is used to measure relative humidity levels >80% RH. An accuracy of ±3% RH has been obtained using this method, with measurement errors of ±0.5°C and ±2% RH in temperature and relative humidity, respectively. The heater also reduces the recovery time after wetting, enables the sensor to recover from contamination and aging, and allows the sensing film to be reset on demand during self-test protocols 相似文献
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Ming-Zhi YangChing-Liang Dai Po-Jen ShihYen-Chi Chen 《Microelectronic Engineering》2011,88(8):1742-1744
The work studies a micro humidity sensor integrated with a seven-stage ring oscillator circuit-on-a-chip fabricated by the commercial 0.35 μm complementary metal oxide semiconductor (CMOS) process and a post-process. The structure of the humidity sensor consists of interdigitated electrodes and a sensing film. The sensing film is cobalt oxide nanosheet that is prepared by a precipitation-oxidation method. The sensor, which is a capacitive type, changes in capacitance when the sensing film adsorbs or desorbs water vapor. The ring oscillator circuit is employed to convert the capacitance of the sensor into the oscillation frequency output. The post-process of the sensor includes etching the sacrificial oxide layer and coating the sensing film on the interdigitated electrodes. 相似文献
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Hélène Conseil-Gudla Morten S. Jellesen Rajan Ambat 《Journal of Electronic Materials》2017,46(2):817-825
Corrosion reliability is a serious issue today for electronic devices, components, and printed circuit boards (PCBs) due to factors such as miniaturization, globalized manufacturing practices which can lead to process-related residues, and global usage effects such as bias voltage and unpredictable user environments. The investigation reported in this paper focuses on understanding the synergistic effect of such parameters, namely contamination, humidity, PCB surface finish, pitch distance, and potential bias on leakage current under different humidity levels, and electrochemical migration probability under condensing conditions. Leakage currents were measured on interdigitated comb test patterns with three different types of surface finish typically used in the electronics industry, namely gold, copper, and tin. Susceptibility to electrochemical migration was studied under droplet conditions. The level of base leakage current (BLC) was similar for the different surface finishes and NaCl contamination levels up to relative humidity (RH) of 65%. A significant increase in leakage current was found for comb patterns contaminated with NaCl above 70% to 75% RH, close to the deliquescent RH of NaCl. Droplet tests on Cu comb patterns with varying pitch size showed that the initial BLC before dendrite formation increased with increasing NaCl contamination level, whereas electrochemical migration and the frequency of dendrite formation increased with bias voltage. The effect of different surface finishes on leakage current under humid conditions was not very prominent. 相似文献
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采用共沉淀法制备SnO2-LiZnVO4系湿敏材料,研究了LiZnVO4的掺杂量对材料湿敏电容的影响。结果表明:LiZnVO4的掺杂量,环境的相对湿度(RH)、测试信号频率对湿敏电容有较大影响。当x(LiZnVO4)为10%时,可使材料具有合适的低湿电容和灵敏度。在100Hz下,当环境的RH从33%上升到93%时,SnO2-LiZnVO4系湿敏材料制备的湿敏元件的电容增量可达起始值的2300%,显示出较高的电容湿度敏感性。湿敏元件的电容响应时间约为54s,恢复时间约为60s。湿滞约为RH6%。 相似文献
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复合钒钛酸干凝胶薄膜的湿敏特性研究 总被引:1,自引:0,他引:1
采用sol-gel法制备了复合钒钛酸干凝胶(H2V10Ti2O30-y·nH2O)薄膜,并对其湿敏特性进行了研究。结果表明:该薄膜为层状结构。用此薄膜制备的湿敏元件,在RH为11%~95%的范围内,感湿特性曲线线性好,其响应、恢复时间分别为5s和20s,湿滞为RH2%,感湿温度系数为RH0.45%/℃,并具有良好的稳定性。H2V10Ti2O30-y·nH2O干凝胶薄膜湿敏元件的灵敏度和湿滞均优于复合钒酸(H2V12O31-y·nH2O)干凝胶薄膜湿敏元件。 相似文献
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Functional antenna integrated with relative humidity sensor using synthesised polyimide for passive RFID sensing 总被引:1,自引:0,他引:1
A new type of antenna with an RH (relative humidity) sensing function using a modified polyimide is proposed for passive RFID sensing. Designed to operate at a frequency that depends on the relative humidity level, the proposed antenna is a passive device that physically and functionally combines an antenna with an RH sensor. The compactness and cost-efficiency of the antenna enables it to realise a passive tag of the RFID sensing without an additional sensor component 相似文献
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高分辨率全帧CCD高速驱动设计 总被引:1,自引:0,他引:1
目前采用高分辨率全帧CCD作为图像传感器的航空遥感相机输出帧频低、驱动设计灵活性低,应用受到限制.为提高全帧CCD相机应用水平,通过FTF5066M驱动电路结构和时序关系分析,采用分离器件设计了全帧CCD的稳压变换电路、偏置电压电路和水平垂直驱动电路.利用FPGA设计了四通道高速并行输出的时序脉冲产生电路,克服了传统单通道输出方法的速度限制.试验中,该驱动电路利用MVC3000F镜头成功采集到高速图像.实验表明,本驱动设计配置灵活,输出帧频从0.7fps提高到2.16fps,充分满足了航空遥感相机的高帧频要求. 相似文献