A new method for reducing the substrate rated losses of integrated spiral inductors is presented.The method is to block the eddy currents induced by spiral inductors by directly forming pn junction isolation in the S...A new method for reducing the substrate rated losses of integrated spiral inductors is presented.The method is to block the eddy currents induced by spiral inductors by directly forming pn junction isolation in the Si substrate. The substrate pn junction can be realized by using the standard silicon technologies without any additional processing steps.Integrated inductors on silicon are designed and fabricated. S parameters of the inductor based equivalent circuit are investigated and the inductor parameters are calculated.The impacts of the substrate pn junction isolation on the inductor quality factor are studied.The experimental results show that substrate pn junction isolation in certain depth has achieved a significant improvement.At 3GHz,the substrate pn junction isolation increases the inductor quality factor by 40%.展开更多
Lithologically, two kinds of chert can be recognized in the Middle-Upper Permian from the Tieqiao section in Laibin area, Guangxi, i.e., calcic chert occurring mainly in the Maokou Formation and pure chert mainly in t...Lithologically, two kinds of chert can be recognized in the Middle-Upper Permian from the Tieqiao section in Laibin area, Guangxi, i.e., calcic chert occurring mainly in the Maokou Formation and pure chert mainly in the Wujiaping Formation. Geochemical data show that both kinds of chert contain very low A1203 （0-0.23%） and TiO2 （0.001%-0.024%） and low ZREE （0.55-19.94 ppm, averaging 9.97 ppm）, as well as high ratio of Fe2O3/TiO2 （17-443, averaging 111） and low ratio of A1203/（Al2O3＋Fe203） （0-0.26, averaging 0.09）. Given that the average value Ce anomalies in chert deposited in the ridge-proximal environment is about 0.29, and that in the pelagic environment is about 0.60, the low Ce anomalies in the Tieqiao chert （0.24-0.46, averaging 0.35） imply that they were deposited in an ocean basin with influence of submarine hydrothermal fluid and no input of terrigenous materials. The vertical variation of the silica abundance in strata （SAIS） in the Middle-Upper Permian strata, together with the Eu anomalies and the ratios of ∑REE/Fe, indicates a relationship between the hydrothermal activity and the Emeishan basalt eruption, and that submarine hydrothermal activity was stronger in the Upper Permian （the Wujiapingian Stage） than in the Middle Permian （the Maokou Stage）.展开更多
文摘A new method for reducing the substrate rated losses of integrated spiral inductors is presented.The method is to block the eddy currents induced by spiral inductors by directly forming pn junction isolation in the Si substrate. The substrate pn junction can be realized by using the standard silicon technologies without any additional processing steps.Integrated inductors on silicon are designed and fabricated. S parameters of the inductor based equivalent circuit are investigated and the inductor parameters are calculated.The impacts of the substrate pn junction isolation on the inductor quality factor are studied.The experimental results show that substrate pn junction isolation in certain depth has achieved a significant improvement.At 3GHz,the substrate pn junction isolation increases the inductor quality factor by 40%.
基金supported by National Basic Research Program of China (Grant No. 2005CB422101)
文摘Lithologically, two kinds of chert can be recognized in the Middle-Upper Permian from the Tieqiao section in Laibin area, Guangxi, i.e., calcic chert occurring mainly in the Maokou Formation and pure chert mainly in the Wujiaping Formation. Geochemical data show that both kinds of chert contain very low A1203 （0-0.23%） and TiO2 （0.001%-0.024%） and low ZREE （0.55-19.94 ppm, averaging 9.97 ppm）, as well as high ratio of Fe2O3/TiO2 （17-443, averaging 111） and low ratio of A1203/（Al2O3＋Fe203） （0-0.26, averaging 0.09）. Given that the average value Ce anomalies in chert deposited in the ridge-proximal environment is about 0.29, and that in the pelagic environment is about 0.60, the low Ce anomalies in the Tieqiao chert （0.24-0.46, averaging 0.35） imply that they were deposited in an ocean basin with influence of submarine hydrothermal fluid and no input of terrigenous materials. The vertical variation of the silica abundance in strata （SAIS） in the Middle-Upper Permian strata, together with the Eu anomalies and the ratios of ∑REE/Fe, indicates a relationship between the hydrothermal activity and the Emeishan basalt eruption, and that submarine hydrothermal activity was stronger in the Upper Permian （the Wujiapingian Stage） than in the Middle Permian （the Maokou Stage）.
