The Experts below are selected from a list of 17058 Experts worldwide ranked by ideXlab platform
Chengxiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Hysteresis Voltage Prediction Control for Multilevel Converter in the Series-Form Switch-Linear Hybrid Envelope Tracking Power Supply
IEEE Transactions on Power Electronics, 2020Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply can achieve high efficiency and high tracking bandwidth simultaneously, and it has two typical forms, namely, series-form and parallel-form. In the series-form SLH ET power supply, the switched-mode converter is expected to output a continuous-wave Voltage which can track the load Voltage accurately to enhance the overall efficiency, and the buck converter with Hysteresis Voltage control (HVC) can be utilized. However, the output Voltage of the buck converter will go over the Hysteresis Voltage boundaries, degrading the linearity and efficiency of the ET power supply. In this article, the Hysteresis Voltage prediction control (HVPC) is proposed to mitigate the problem in the HVC for buck converter. Moreover, in order to further increase the efficiency, the multilevel converter (MLC) is adopted instead of the buck converter for reducing the switching frequency and the inductor root-mean-square current, and the corresponding HVPC control strategy is also proposed. A prototype of the series-form SLH ET power supply employing the MLC with HVPC aimed at 5-MHz envelope signal is fabricated in the lab. The measured overall efficiency is 77.5%, a 12% efficiency improvement over that using step-wave switched-mode converter.
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Digitally-Assisted Hysteresis Voltage Prediction Control For Series-Form Switch-Linear Hybrid Envelope-Tracking Power Supply
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply has been widely used since it is featured with both high efficiency and wide bandwidth. In series-form SLH ET power supply, the power consumption of linear amplifier takes a huge part of the total power loss of the power supply. Therefore, the output Voltage of switch-mode converter is expected to track the load Voltage accurately. Hysteresis Voltage control (HVC) is widely used due to its good robustness and fast dynamic response. However, the output Voltage of switch-mode converter utilizing HVC will exceed the boundary of the Hysteresis loop. This paper proposes a digitally-assisted Hysteresis Voltage prediction control to reduce the Voltage scaling out the Hysteresis border and further increase the efficiency of ET power supply. A prototype is built aiming for 5MHz tracking bandwidth, with 18W average output power. The experimental results verify the effectiveness of the proposed method.
Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.
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Hysteresis Voltage Prediction Control for Multilevel Converter in the Series-Form Switch-Linear Hybrid Envelope Tracking Power Supply
IEEE Transactions on Power Electronics, 2020Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply can achieve high efficiency and high tracking bandwidth simultaneously, and it has two typical forms, namely, series-form and parallel-form. In the series-form SLH ET power supply, the switched-mode converter is expected to output a continuous-wave Voltage which can track the load Voltage accurately to enhance the overall efficiency, and the buck converter with Hysteresis Voltage control (HVC) can be utilized. However, the output Voltage of the buck converter will go over the Hysteresis Voltage boundaries, degrading the linearity and efficiency of the ET power supply. In this article, the Hysteresis Voltage prediction control (HVPC) is proposed to mitigate the problem in the HVC for buck converter. Moreover, in order to further increase the efficiency, the multilevel converter (MLC) is adopted instead of the buck converter for reducing the switching frequency and the inductor root-mean-square current, and the corresponding HVPC control strategy is also proposed. A prototype of the series-form SLH ET power supply employing the MLC with HVPC aimed at 5-MHz envelope signal is fabricated in the lab. The measured overall efficiency is 77.5%, a 12% efficiency improvement over that using step-wave switched-mode converter.
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Digitally-Assisted Hysteresis Voltage Prediction Control For Series-Form Switch-Linear Hybrid Envelope-Tracking Power Supply
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply has been widely used since it is featured with both high efficiency and wide bandwidth. In series-form SLH ET power supply, the power consumption of linear amplifier takes a huge part of the total power loss of the power supply. Therefore, the output Voltage of switch-mode converter is expected to track the load Voltage accurately. Hysteresis Voltage control (HVC) is widely used due to its good robustness and fast dynamic response. However, the output Voltage of switch-mode converter utilizing HVC will exceed the boundary of the Hysteresis loop. This paper proposes a digitally-assisted Hysteresis Voltage prediction control to reduce the Voltage scaling out the Hysteresis border and further increase the efficiency of ET power supply. A prototype is built aiming for 5MHz tracking bandwidth, with 18W average output power. The experimental results verify the effectiveness of the proposed method.
Tsu-jae King Liu - One of the best experts on this subject based on the ideXlab platform.
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study of mem relay contact design and body bias effects on on state resistance stability
IEEE\ ASME Journal of Microelectromechanical Systems, 2020Co-Authors: Benjamin Osoba, Sergio F Almeida, Urmita Sikder, Tsegereda Kedir Esatu, Tsu-jae King LiuAbstract:Body-biased micro-electro-mechanical (MEM) relays previously have been demonstrated to be a promising alternative to transistors for ultra-low Voltage digital logic applications. A basic requirement for reliable relay-based circuit operation is suitably low and stable relay ON-state resistance ( $R_{\mathbf {ON}}$ ). In this work, the effect of body biasing on $\text{R}_{\mathbf {ON}}$ is investigated for relays of different contact designs. It is found that a single direct contact design not only provides for the smallest Hysteresis Voltage but also the smallest $R_{\mathbf {ON}}$ , making it the most suitable for low Voltage applications. Body-biased operation is found to degrade $R_{\mathbf {ON}}$ stability over many ON/OFF switching cycles, however, due to a reduction in contact velocity. [2020-0297]
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reducing adhesion energy of nano electro mechanical relay contacts by self assembled perfluoro 2 3 dimethylbutan 2 ol coating
AIP Advances, 2019Co-Authors: Sara Fathipou, Sergio F Almeida, Ivas Saha, Farnaz Niroui, Tsu-jae King LiuAbstract:To enable energy-efficient electronic devices for the future, nano-electro-mechanical (NEM) relays are promising due to their high ON/OFF current ratio and potential for low operating Voltage. To minimize Hysteresis and, consequently, relay operating Voltage, it is imperative to reduce the relay contact adhesion, which can be achieved by coating the contacts with anti-stiction self-assembled monolayers. Herein we report a 71% reduction in Hysteresis Voltage by utilizing a branched perfluorocarbon antistiction molecule: Perfluoro (2,3-Dimethylbutan-2-ol) (PDB) on top of the tungsten contact surfaces. Experimental results show the operation of a PDB-coated NEM relay with abrupt switching, undetectably low OFF-state current, Hysteresis Voltage as low as 20 mV, and a large ON/OFF current ratio (>107).To enable energy-efficient electronic devices for the future, nano-electro-mechanical (NEM) relays are promising due to their high ON/OFF current ratio and potential for low operating Voltage. To minimize Hysteresis and, consequently, relay operating Voltage, it is imperative to reduce the relay contact adhesion, which can be achieved by coating the contacts with anti-stiction self-assembled monolayers. Herein we report a 71% reduction in Hysteresis Voltage by utilizing a branched perfluorocarbon antistiction molecule: Perfluoro (2,3-Dimethylbutan-2-ol) (PDB) on top of the tungsten contact surfaces. Experimental results show the operation of a PDB-coated NEM relay with abrupt switching, undetectably low OFF-state current, Hysteresis Voltage as low as 20 mV, and a large ON/OFF current ratio (>107).
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reducing adhesion energy of nano electro mechanical relay contacts by self assembled perfluoro 2 3 dimethylbutan 2 ol coating
AIP Advances, 2019Co-Authors: Sara Fathipour, Bivas Saha, Sergio F Almeida, Farnaz Niroui, Tsu-jae King LiuAbstract:To enable energy-efficient electronic devices for the future, nano-electro-mechanical (NEM) relays are promising due to their high ON/OFF current ratio and potential for low operating Voltage. To minimize Hysteresis and, consequently, relay operating Voltage, it is imperative to reduce the relay contact adhesion, which can be achieved by coating the contacts with anti-stiction self-assembled monolayers. Herein we report a 71% reduction in Hysteresis Voltage by utilizing a branched perfluorocarbon antistiction molecule: Perfluoro (2,3-Dimethylbutan-2-ol) (PDB) on top of the tungsten contact surfaces. Experimental results show the operation of a PDB-coated NEM relay with abrupt switching, undetectably low OFF-state current, Hysteresis Voltage as low as 20 mV, and a large ON/OFF current ratio (>107).
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Variability Study for Low-Voltage Microelectromechanical Relay Operation
IEEE Transactions on Electron Devices, 2018Co-Authors: Benjamin Osoba, Bivas Saha, Sergio F Almeida, Jatin Patil, Laura E. Brandt, Maurice E. D. Roots, Edgar Acosta, Tsu-jae King LiuAbstract:Body-biased microelectromechanical relays previously have been developed for ultralow-power digital logic applications and demonstrated to reliably switch ON/OFF with sub-50-mV gate Voltage swing. Since variability in relay switching Voltages can practically limit reduction in the operating Voltage of a relay-based integrated circuit, the effects of process-induced variations and device operating conditions, as well as the stability of relay switching Voltages, are investigated in this paper. Antistiction coating is shown to stably reduce Hysteresis Voltage and random variation thereof, which is beneficial for Voltage scaling.
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Reducing adhesion energy of micro-relay electrodes by ion beam synthesized oxide nanolayers
APL Materials, 2017Co-Authors: Bivas Saha, Alexis Peschot, Benjamin Osoba, Leonard M. Rubin, Tsu-jae King LiuAbstract:Reduction in the adhesion energy of contacting metal electrode surfaces in nano-electro-mechanical switches is crucial for operation with low Hysteresis Voltage. We demonstrate that by forming thin layers of metal-oxides on metals such as Ru and W, the adhesion energy can be reduced by up to a factor of ten. We employ a low-energy ion-beam synthesis technique and subsequent thermal annealing to form very thin layers (∼2 nm) of metal-oxides (such as RuO2 and WOx) on Ru and W metal surfaces and quantify the adhesion energy using an atomic force microscope with microspherical tips.
Yazhou Wang - One of the best experts on this subject based on the ideXlab platform.
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Hysteresis Voltage Prediction Control for Multilevel Converter in the Series-Form Switch-Linear Hybrid Envelope Tracking Power Supply
IEEE Transactions on Power Electronics, 2020Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply can achieve high efficiency and high tracking bandwidth simultaneously, and it has two typical forms, namely, series-form and parallel-form. In the series-form SLH ET power supply, the switched-mode converter is expected to output a continuous-wave Voltage which can track the load Voltage accurately to enhance the overall efficiency, and the buck converter with Hysteresis Voltage control (HVC) can be utilized. However, the output Voltage of the buck converter will go over the Hysteresis Voltage boundaries, degrading the linearity and efficiency of the ET power supply. In this article, the Hysteresis Voltage prediction control (HVPC) is proposed to mitigate the problem in the HVC for buck converter. Moreover, in order to further increase the efficiency, the multilevel converter (MLC) is adopted instead of the buck converter for reducing the switching frequency and the inductor root-mean-square current, and the corresponding HVPC control strategy is also proposed. A prototype of the series-form SLH ET power supply employing the MLC with HVPC aimed at 5-MHz envelope signal is fabricated in the lab. The measured overall efficiency is 77.5%, a 12% efficiency improvement over that using step-wave switched-mode converter.
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Digitally-Assisted Hysteresis Voltage Prediction Control For Series-Form Switch-Linear Hybrid Envelope-Tracking Power Supply
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019Co-Authors: Xinbo Ruan, Yazhou Wang, Chengxiang ZhangAbstract:Switch-linear hybrid (SLH) envelope tracking (ET) power supply has been widely used since it is featured with both high efficiency and wide bandwidth. In series-form SLH ET power supply, the power consumption of linear amplifier takes a huge part of the total power loss of the power supply. Therefore, the output Voltage of switch-mode converter is expected to track the load Voltage accurately. Hysteresis Voltage control (HVC) is widely used due to its good robustness and fast dynamic response. However, the output Voltage of switch-mode converter utilizing HVC will exceed the boundary of the Hysteresis loop. This paper proposes a digitally-assisted Hysteresis Voltage prediction control to reduce the Voltage scaling out the Hysteresis border and further increase the efficiency of ET power supply. A prototype is built aiming for 5MHz tracking bandwidth, with 18W average output power. The experimental results verify the effectiveness of the proposed method.
Tung-ming Pan - One of the best experts on this subject based on the ideXlab platform.
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High-Performance Solution-Processed La₂Ti₂O₇ Sensing Film for a Capacitive Electrolyte–Insulator–Semiconductor pH Sensor
IEEE Electron Device Letters, 2021Co-Authors: Prabir Garu, Sankar Prasad Bag, Tung-ming PanAbstract:This work presents a comparison between the La2O3 and La2Ti2O7 sensing membranes for solution-based capacitive electrolyte-insulator-semiconductor (EIS) pH sensors. The La2O3 and La2Ti2O7 sensing membranes were fabricated through a simple spin-coating method. The structural characteristics of these sensing membranes were examined by using X-ray photoelectron spectroscopy and X-ray diffraction. The La2Ti2O7 EIS sensor made using the spin-coating process demonstrated a higher sensitivity of 70.60 mV/pH, a smaller drift rate of 0.14 mV/h and a lower Hysteresis Voltage of 1 mV, as compared to the La2O3 EIS sensor.
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Solution processed ZnInxOy sensing membranes on flexible PEN for extended-gate field-effect transistor pH sensors
Journal of Alloys and Compounds, 2020Co-Authors: Tung-ming Pan, Yen-hsiang Huang, Jim-long Her, Bih-show Lou, See-tong PangAbstract:Abstract This work describes the impact of indium content of the structural properties and sensing characteristics of ZnInxOy sensing films for extended-gate field-effect transistor (EGFET) sensors. The synthesis of the ZnInxOy sensing films was made by a solution processing technique directly deposited on flexible polyethylene naphthalate (PEN) through a simple spin-coating method. The synthesized ZnInxOy films at three different indium concentrations (10%, 20% and 30% moles) were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, and atomic force microscopy to examine their chemical features, film structures and surface morphologies, respectively. Experiments were performed to explore the pH sensitivity, drift rate, and Hysteresis Voltage in the ZnInxOy EGFET sensors. Compare with these conditions, a higher pH sensitivity of 61.76 mV/pH, a lower drift rate of 1.08 mV/h, and a smaller Hysteresis Voltage of ∼1 mV were obtained in the ZnInxOy EGFET sensor fabricated at the 20% condition. Moreover, after 500 bending cycles, the ZnInxOy EGFET sensor fabricated at the 20% condition showed good mechanical flexibility. The ZnInxOy EGFET sensor also demonstrated a high selective response towards H+. This result indicates that the ZnInxOy sensing film with a rougher surface and a higher Zn–O–In content to generate lower crystal deformities, imperfections and oxygen vacancies.
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Sensing and Impedance Characteristics of YbTaO_4 Sensing Membranes
Scientific Reports, 2018Co-Authors: Tung-ming Pan, Yu-shu Huang, Jim-long HerAbstract:In this study we developed ytterbium tantalum oxide (YbTaO_4) sensing membranes for use in electrolyte–insulator–semiconductor (EIS) pH sensors. The influence of rapid thermal annealing (RTA) treatment on the sensing and impedance properties of the YbTaO_4 sensing membranes deposited through reactive co-sputtering onto Si substrates was explored. X-ray diffraction, atomic force microscopy, and X-ray photoelectron spectroscopy revealed the structural, morphological, and chemical features, respectively, of these YbTaO_4 films annealed at 700, 800 and 900 °C. The YbTaO_4 EIS device annealed at the 800 °C exhibited a super-Nernstian response of 71.17 mV/pH within the pH range of 2–12. It also showed the lowest Hysteresis Voltage (
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Comparison of CeTiO 3 and Ce 2 TiO 5 Sensing Films for pH Sensors
IEEE Electron Device Letters, 2018Co-Authors: Tung-ming Pan, Yen-hsiang Huang, Jim-long Her, Bih-show Lou, Sheng-han Tsai, See-tong PangAbstract:In this letter, we compared the structural and sensing properties of CeTiO3 and Ce2TiO5 sensing films for electrolyte–insulator–semiconductor (EIS) pH sensors. The structural behavior of these sensing films was characterized by Auger electron spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. In comparison with CeTiO3 sensing film, the EIS sensor using a Ce2TiO5 sensing film exhibited better sensing performance including higher sensitivity (68.35 mV/pH), lower Hysteresis Voltage (0.9 mV), and smaller drift rate (0.19 mV/h), presumably suggesting this film possessing a high fraction of Ce3+ and a rough surface.
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Structural and Sensing Properties of Sol–Gel Synthesized Ce 2 (Zr 1– x Ti x )O y Sensing Films for pH Sensors
IEEE Transactions on Electron Devices, 2017Co-Authors: Sankar Prasad Bag, Bih-show Lou, Jim-long Her, See-tong Pang, Tung-ming PanAbstract:In this brief, the structural properties and sensing characteristics of spin-coated Ce2(Zr1–xTix)Oy (CZT) sensing film were investigated for electrolyte–insulator–semiconductor (EIS) pH sensors. A higher pH sensitivity of 64.42 mV/pH, a lower Hysteresis Voltage of 1.1 mV, and a smaller drift rate of 0.36 mV/h were achieved in the CZT-embedded EIS sensors at Zr/Ti = 53/47 stoichiometry. The higher sensing behavior in CZT is attributed to the good crystallization and higher surface roughness of the film.