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18GHz高增益高效率功率运用的AlGaAs/GaAs HBT
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作者 n.l.wang 刘秀兰 《半导体情报》 1991年第2期18-22,共5页
在18GHz,AlGaAs/GaAs HBT已得到了显著的功率性能。共发射极HBT达到了48.5%的附加效率、6.2dB相关增益和0.17W的输出功率。共基极工作的HBT在18GHz下显示出更高的性能:功率水平0.358W(3.58W/mm),增益11.4dB,附加效率43%;降低功率水平... 在18GHz,AlGaAs/GaAs HBT已得到了显著的功率性能。共发射极HBT达到了48.5%的附加效率、6.2dB相关增益和0.17W的输出功率。共基极工作的HBT在18GHz下显示出更高的性能:功率水平0.358W(3.58W/mm),增益11.4dB,附加效率43%;降低功率水平到0.174W(1.74W/mm),则可得到15.3dB相关功率增益以及40%效率。该性能可与MISFET、HEMT和PBT的报道结果相媲美。 展开更多
关键词 ALGAAS/GAAS HBT 晶体管 异质结
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Optical spectroscopy study of charge density wave order in Sr3Rh4Sn13 and(Sr0.5Ca0.5)3Rh4Sn13
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作者 W.J.Ban H.E Wang +3 位作者 C.W.Tseng C.N.Kuo C.S.Lue n.l.wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第4期51-56,共6页
We perform optical spectroscopy measurement on single-crystal samples of Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13. Formation of CDW energy gap was clearly observed for both single-crystal samples when they undergo the ph... We perform optical spectroscopy measurement on single-crystal samples of Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13. Formation of CDW energy gap was clearly observed for both single-crystal samples when they undergo the phase transitions. The existence of residual Drude components in σ1(ω) below Tcow indicates that the Fermi surface is only partially gapped in the CDW state. The obtained value of 2A/kBTcow is roughly 13 for both Sr3Rh4Sn13 and (Sr0.5Ca0.5)3Rh4Sn13 compounds, which is considerably larger than the mean-field value based on the weak-coupling BCS theory. The measurements provide optical evidence for the strong coupling characteristics of the CDW phase transition. 展开更多
关键词 charge density wave optical spectroscopy intermetallic compounds
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