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Qiang Li - One of the best experts on this subject based on the ideXlab platform.
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A 0.5–1.1-V Adaptive Bypassing SAR ADC Utilizing the Oscillation-Cycle Information of a VCO-Based Comparator
IEEE Journal of Solid-state Circuits, 2019Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:A successive approximation register (SAR) analog-to-digital converter (ADC) with a voltage-controlled oscillator (VCO)-based comparator is presented in this paper. The relationship between the input voltage and the number of Oscillation Cycles (NOC) to reach a VCO-comparator decision is explored, implying an inherent coarse quantization in parallel with the normal comparison. The NOC as a design parameter is introduced and analyzed with noise, metastability, and tradeoff considerations. The NOC is exploited to bypass a certain number of SAR Cycles for higher power efficiency of VCO-based SAR ADCs. To cope with the process, voltage, and temperature (PVT) variations, an adaptive bypassing technique is proposed, tracking and correcting window sizes in the background. Fabricated in a 40-nm CMOS process, the ADC achieves a peak effective number of bits of 9.71 b at 10 MS/s. Walden figure of merit (FoM) of 2.4–6.85 fJ/conv.-step is obtained over a wide range of supply voltages and sampling rates. Measurement has been carried out under typical, fast-fast, and slow-slow process corners and 0 °C–100 °C temperature range, showing that the proposed ADC is robust over PVT variations without any off-chip calibration or tuning.
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a 0 5 1 1v 10b adaptive bypassing sar adc utilizing Oscillation Cycle information of vco based comparator
Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
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VLSI Circuits - A 0.5-1.1V 10B Adaptive Bypassing SAR ADC Utilizing Oscillation Cycle Information of VCO-Based Comparator
2018 IEEE Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
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Damping in viscoelastic contacts under combined normal and tangential Oscillation
2015Co-Authors: Mikhail Popov, Qiang Li, Nikita PopovAbstract:Damping in the contact of a rigid conical indenter with a viscoelastic half-space under superimposed normal and tangential Oscillation is considered, with perfect sticking in the contact. The viscoelastic half-space is modeled with the Kelvin material. The energy dissipated per Oscillation Cycle is determined numerically in the framework of the method of dimensionality reduction (MDR). A particular focus of the present study is the influence of the changes in contact area due to the normal Oscillation on the tangential component of dissipation.
Zhaoming Ding - One of the best experts on this subject based on the ideXlab platform.
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A 0.5–1.1-V Adaptive Bypassing SAR ADC Utilizing the Oscillation-Cycle Information of a VCO-Based Comparator
IEEE Journal of Solid-state Circuits, 2019Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:A successive approximation register (SAR) analog-to-digital converter (ADC) with a voltage-controlled oscillator (VCO)-based comparator is presented in this paper. The relationship between the input voltage and the number of Oscillation Cycles (NOC) to reach a VCO-comparator decision is explored, implying an inherent coarse quantization in parallel with the normal comparison. The NOC as a design parameter is introduced and analyzed with noise, metastability, and tradeoff considerations. The NOC is exploited to bypass a certain number of SAR Cycles for higher power efficiency of VCO-based SAR ADCs. To cope with the process, voltage, and temperature (PVT) variations, an adaptive bypassing technique is proposed, tracking and correcting window sizes in the background. Fabricated in a 40-nm CMOS process, the ADC achieves a peak effective number of bits of 9.71 b at 10 MS/s. Walden figure of merit (FoM) of 2.4–6.85 fJ/conv.-step is obtained over a wide range of supply voltages and sampling rates. Measurement has been carried out under typical, fast-fast, and slow-slow process corners and 0 °C–100 °C temperature range, showing that the proposed ADC is robust over PVT variations without any off-chip calibration or tuning.
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a 0 5 1 1v 10b adaptive bypassing sar adc utilizing Oscillation Cycle information of vco based comparator
Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
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VLSI Circuits - A 0.5-1.1V 10B Adaptive Bypassing SAR ADC Utilizing Oscillation Cycle Information of VCO-Based Comparator
2018 IEEE Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
Wen Zhou - One of the best experts on this subject based on the ideXlab platform.
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Changes in Western Pacific Tropical Cyclones Associated with the El Niño–Southern Oscillation Cycle
Journal of Climate, 2012Co-Authors: Richard C Y Li, Wen ZhouAbstract:AbstractThis study examines the interannual variability of three groups of tropical cyclones (TCs)—super typhoons (STYs), typhoons (TYs), and tropical storms and tropical depressions (TSTDs)—and their relationship with the El Nino–Southern Oscillation (ENSO). Both wavelet analysis and correlation studies of upper-ocean heat content reveal significant differences for the three types of TCs. In particular, an increase (decrease) in the frequency of STYs is usually associated with the mature phase of El Nino (La Nina) events, while the converse is true for TSTDs. In contrast, the frequency of TYs increases (decreases) during the transition period from La Nina to El Nino (El Nino to La Nina) events. The results suggest that the timing with which ENSO impacts STYs, TYs, and TSTDs varies and that their corresponding changes in frequency closely follow the evolution of the ENSO Cycle.Empirical orthogonal function analysis is also conducted to investigate the impact of different environmental factors influenced b...
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changes in western pacific tropical cyclones associated with the el nino southern Oscillation Cycle
Journal of Climate, 2012Co-Authors: Richard C Y Li, Wen ZhouAbstract:AbstractThis study examines the interannual variability of three groups of tropical cyclones (TCs)—super typhoons (STYs), typhoons (TYs), and tropical storms and tropical depressions (TSTDs)—and their relationship with the El Nino–Southern Oscillation (ENSO). Both wavelet analysis and correlation studies of upper-ocean heat content reveal significant differences for the three types of TCs. In particular, an increase (decrease) in the frequency of STYs is usually associated with the mature phase of El Nino (La Nina) events, while the converse is true for TSTDs. In contrast, the frequency of TYs increases (decreases) during the transition period from La Nina to El Nino (El Nino to La Nina) events. The results suggest that the timing with which ENSO impacts STYs, TYs, and TSTDs varies and that their corresponding changes in frequency closely follow the evolution of the ENSO Cycle.Empirical orthogonal function analysis is also conducted to investigate the impact of different environmental factors influenced b...
Xiong Zhou - One of the best experts on this subject based on the ideXlab platform.
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A 0.5–1.1-V Adaptive Bypassing SAR ADC Utilizing the Oscillation-Cycle Information of a VCO-Based Comparator
IEEE Journal of Solid-state Circuits, 2019Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:A successive approximation register (SAR) analog-to-digital converter (ADC) with a voltage-controlled oscillator (VCO)-based comparator is presented in this paper. The relationship between the input voltage and the number of Oscillation Cycles (NOC) to reach a VCO-comparator decision is explored, implying an inherent coarse quantization in parallel with the normal comparison. The NOC as a design parameter is introduced and analyzed with noise, metastability, and tradeoff considerations. The NOC is exploited to bypass a certain number of SAR Cycles for higher power efficiency of VCO-based SAR ADCs. To cope with the process, voltage, and temperature (PVT) variations, an adaptive bypassing technique is proposed, tracking and correcting window sizes in the background. Fabricated in a 40-nm CMOS process, the ADC achieves a peak effective number of bits of 9.71 b at 10 MS/s. Walden figure of merit (FoM) of 2.4–6.85 fJ/conv.-step is obtained over a wide range of supply voltages and sampling rates. Measurement has been carried out under typical, fast-fast, and slow-slow process corners and 0 °C–100 °C temperature range, showing that the proposed ADC is robust over PVT variations without any off-chip calibration or tuning.
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a 0 5 1 1v 10b adaptive bypassing sar adc utilizing Oscillation Cycle information of vco based comparator
Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
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VLSI Circuits - A 0.5-1.1V 10B Adaptive Bypassing SAR ADC Utilizing Oscillation Cycle Information of VCO-Based Comparator
2018 IEEE Symposium on VLSI Circuits, 2018Co-Authors: Zhaoming Ding, Xiong Zhou, Qiang LiAbstract:VCO-based comparators generate both bit decisions as well as Oscillation Cycle information, whereas the latter has not been exploited in SAR ADCs. This work presents a SAR ADC using Oscillation Cycle as the thresholds for multiple bypass windows, which improves energy efficiency. PVT-induced variations are compensated by adaptive windowing. The implemented 40nm ADC is robust under wide supply voltages ranging 0.5-1.1V with 9.71b peak ENOB at 1.1V and 2.4fJ/c.-s. lowest FoM at 0.5V without any tuning.
Richard C Y Li - One of the best experts on this subject based on the ideXlab platform.
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Changes in Western Pacific Tropical Cyclones Associated with the El Niño–Southern Oscillation Cycle
Journal of Climate, 2012Co-Authors: Richard C Y Li, Wen ZhouAbstract:AbstractThis study examines the interannual variability of three groups of tropical cyclones (TCs)—super typhoons (STYs), typhoons (TYs), and tropical storms and tropical depressions (TSTDs)—and their relationship with the El Nino–Southern Oscillation (ENSO). Both wavelet analysis and correlation studies of upper-ocean heat content reveal significant differences for the three types of TCs. In particular, an increase (decrease) in the frequency of STYs is usually associated with the mature phase of El Nino (La Nina) events, while the converse is true for TSTDs. In contrast, the frequency of TYs increases (decreases) during the transition period from La Nina to El Nino (El Nino to La Nina) events. The results suggest that the timing with which ENSO impacts STYs, TYs, and TSTDs varies and that their corresponding changes in frequency closely follow the evolution of the ENSO Cycle.Empirical orthogonal function analysis is also conducted to investigate the impact of different environmental factors influenced b...
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changes in western pacific tropical cyclones associated with the el nino southern Oscillation Cycle
Journal of Climate, 2012Co-Authors: Richard C Y Li, Wen ZhouAbstract:AbstractThis study examines the interannual variability of three groups of tropical cyclones (TCs)—super typhoons (STYs), typhoons (TYs), and tropical storms and tropical depressions (TSTDs)—and their relationship with the El Nino–Southern Oscillation (ENSO). Both wavelet analysis and correlation studies of upper-ocean heat content reveal significant differences for the three types of TCs. In particular, an increase (decrease) in the frequency of STYs is usually associated with the mature phase of El Nino (La Nina) events, while the converse is true for TSTDs. In contrast, the frequency of TYs increases (decreases) during the transition period from La Nina to El Nino (El Nino to La Nina) events. The results suggest that the timing with which ENSO impacts STYs, TYs, and TSTDs varies and that their corresponding changes in frequency closely follow the evolution of the ENSO Cycle.Empirical orthogonal function analysis is also conducted to investigate the impact of different environmental factors influenced b...