Cold ions of plasmaspheric origin have been observed to abundantly appear in the magnetospheric side of the Earth's magnetopause. These cold ions could affect the magnetic reconnection processes at the magnetopaus...Cold ions of plasmaspheric origin have been observed to abundantly appear in the magnetospheric side of the Earth's magnetopause. These cold ions could affect the magnetic reconnection processes at the magnetopause by changing the Alfvén velocity and the reconnection rate, while they could also be heated in the reconnection layer during the ongoing reconnections. We report in situ observations from a partially crossing of a reconnection layer near the subsolar magnetopause. During this crossing, step-like accelerating processes of the cold ions were clearly observed, suggesting that the inflow cold ions may be separately accelerated by the rotation discontinuity and slow shock inside the reconnection layer.展开更多
This paper presents a power-efficient 100-MS/s,10-bit asynchronous successive approximation register（SAR） ADC.It includes an on-chip reference buffer and the total power dissipation is 6.8 mW.To achieve high perform...This paper presents a power-efficient 100-MS/s,10-bit asynchronous successive approximation register（SAR） ADC.It includes an on-chip reference buffer and the total power dissipation is 6.8 mW.To achieve high performance with high power-efficiency in the proposed ADC,bootstrapped switch,redundancy,set-and-down switching approach,dynamic comparator and dynamic logic techniques are employed.The prototype was fabricated using 65 nm standard CMOS technology.At a 1.2-V supply and 100 MS/s,the ADC achieves an SNDR of 56.2 dB and a SFDR of 65.1 dB.The ADC core consumes only 3.1 mW,resulting in a figure of merit（FOM） of 30.27 fJ/conversionstep and occupies an active area of only 0.009 mm^2.展开更多
基金supported by the National Natural Science Foundation of China(41574138,41604139)the Shandong Provincial Natural Science Foundation(JQ201412)+5 种基金the Chinese Meridian ProjectReading University was supported by STFC consolidated(ST/M000885/1)The Norwegian contribution was supported by the Research Council of Norway(230996.S.R.Z.)support from the U.S.NASA LWS Project(NNX15AB83G)the U.S.Do D MURI Project(ONR15-FOA-0011)supported by the U.S.NSF Geospace Facility program under an agreement AGS-1242204 with Massachusetts Institute of Technology
文摘Cold ions of plasmaspheric origin have been observed to abundantly appear in the magnetospheric side of the Earth's magnetopause. These cold ions could affect the magnetic reconnection processes at the magnetopause by changing the Alfvén velocity and the reconnection rate, while they could also be heated in the reconnection layer during the ongoing reconnections. We report in situ observations from a partially crossing of a reconnection layer near the subsolar magnetopause. During this crossing, step-like accelerating processes of the cold ions were clearly observed, suggesting that the inflow cold ions may be separately accelerated by the rotation discontinuity and slow shock inside the reconnection layer.
文摘This paper presents a power-efficient 100-MS/s,10-bit asynchronous successive approximation register（SAR） ADC.It includes an on-chip reference buffer and the total power dissipation is 6.8 mW.To achieve high performance with high power-efficiency in the proposed ADC,bootstrapped switch,redundancy,set-and-down switching approach,dynamic comparator and dynamic logic techniques are employed.The prototype was fabricated using 65 nm standard CMOS technology.At a 1.2-V supply and 100 MS/s,the ADC achieves an SNDR of 56.2 dB and a SFDR of 65.1 dB.The ADC core consumes only 3.1 mW,resulting in a figure of merit（FOM） of 30.27 fJ/conversionstep and occupies an active area of only 0.009 mm^2.
