Planck low frequency instrument (LFI) 70 GHz receiver modules

P. Sjöman, N. J. Hughes, P. Jukkala, S. Ovaska, J. Varis, J. Tuovinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Elegant Breadboard Model of an ultra low noise 70 GHz continuous comparator total power radiometer with 20 % frequency bandwidth has been built for the ESA Planck Mission. The receiver consists of two separate modules: Front End Module (FEM) and Back-End Module (BEM). The FEM is cooled to 20 K physical temperature while the BEM is operating at room temperature. This continuous comparison receiver is based on use of a structure of similar to a balanced amplifier in the FEM. The FEM LNAs are based on state-of-the-art InP HEMTs processed at NGST (ex. TRW). In addition to this, phase shifters are placed between the FEM hybrids to facilitate DPDT-switching capability. The switching capability is used to remove 1/f noise at the Back-End Module (BEM) amplifier chain. The switching rate is 1 kHz. ehkä More than 35 dB gain and an average 25 K noise temperature was measured at 20 K physical temperature in the Front-End Module (FEM). A 20 dB isolation between the signal and reference channel has been obtained at 20 K physical temperature. A Back-End Module (BEM) having 20 dB RF gain and 20 dB post detection voltage gain has also been built and measured with the FEM.

    Original languageEnglish
    Title of host publicationProceedings of the International Conference on Electromagnetics in Advanced Applications, ICEAA '03
    Pages351-354
    Number of pages4
    Publication statusPublished - 2003
    MoE publication typeA4 Article in a conference publication
    Event8th International Conference on Electromagnetics in Advanced Applications, ICEAA 2003 - Torino, Italy
    Duration: 8 Sept 200312 Sept 2003

    Conference

    Conference8th International Conference on Electromagnetics in Advanced Applications, ICEAA 2003
    Country/TerritoryItaly
    CityTorino
    Period8/09/0312/09/03

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