{"title":"Cryogenic, HEMT, low-noise receivers for 1.3 to 43 GHz range","authors":"S. Weinreb, M. Pospieszalski, R. Norrod","doi":"10.1109/MWSYM.1988.22187","DOIUrl":null,"url":null,"abstract":"After a review of recent progress in cryogenically cooled high-electron-mobility-transistor (HEMT) devices and amplifiers, a description is given of the construction and performance of a number of receiver front-ends built for radioastronomy applications using very-low-noise HEMT amplifiers and small, closed-cycle 13 K refrigerators. The noise temperature of receivers, measured at the room temperature circular waveguide input (for example, 10.5 K at 8.4 GHz), are only slightly inferior to those of solid-state maser receivers. A summary of the noise performance of all cryogenic front-ends constructed or planned for the very long baseline array (VLBA), comprised of ten 25-m-diameter paraboloidal reflectors each located in a different site within the US, is given.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"8 5 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"21","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1988., IEEE MTT-S International Microwave Symposium Digest","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.1988.22187","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 21
Abstract
After a review of recent progress in cryogenically cooled high-electron-mobility-transistor (HEMT) devices and amplifiers, a description is given of the construction and performance of a number of receiver front-ends built for radioastronomy applications using very-low-noise HEMT amplifiers and small, closed-cycle 13 K refrigerators. The noise temperature of receivers, measured at the room temperature circular waveguide input (for example, 10.5 K at 8.4 GHz), are only slightly inferior to those of solid-state maser receivers. A summary of the noise performance of all cryogenic front-ends constructed or planned for the very long baseline array (VLBA), comprised of ten 25-m-diameter paraboloidal reflectors each located in a different site within the US, is given.<>
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