{"title":"High-current-gain InP DHBTs with a passivation ledge demonstrating ft and fmax of over 440 GHz","authors":"N. Kashio, K. Kurishima, M. Ida, H. Matsuzaki","doi":"10.1109/ICIPRM.2014.6880564","DOIUrl":null,"url":null,"abstract":"This paper reports current gain and high-frequency characteristics of InP DHBTs with a passivation ledge and various emitter sizes. With the passivation ledge, current gain of over 40 is maintained even for a 0.25-μm-emitter HBT. The f<sub>t</sub> is over 420 GHz for HBTs with emitters ranging from 0.25 to 0.5 μm. On the other hand, the f<sub>max</sub> greatly increases from 320 to 440 GHz with decreasing emitter width from 0.5 to 0.25 μm. These results indicate that the 0.25-μm-emitter HBT exhibits balanced high-frequency performance (f<sub>t</sub>= 449 GHz and f<sub>max</sub>= 440 GHz) while maintaining a current gain of over 40.","PeriodicalId":181494,"journal":{"name":"26th International Conference on Indium Phosphide and Related Materials (IPRM)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2014-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"26th International Conference on Indium Phosphide and Related Materials (IPRM)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICIPRM.2014.6880564","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
This paper reports current gain and high-frequency characteristics of InP DHBTs with a passivation ledge and various emitter sizes. With the passivation ledge, current gain of over 40 is maintained even for a 0.25-μm-emitter HBT. The ft is over 420 GHz for HBTs with emitters ranging from 0.25 to 0.5 μm. On the other hand, the fmax greatly increases from 320 to 440 GHz with decreasing emitter width from 0.5 to 0.25 μm. These results indicate that the 0.25-μm-emitter HBT exhibits balanced high-frequency performance (ft= 449 GHz and fmax= 440 GHz) while maintaining a current gain of over 40.
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