Abstract
The 30 and 44 GHz Back End Modules (BEM) for the Planck LowFrequency Instrument are broadband receivers (20% relative bandwidth)working at room temperature. The signals coming from the Front EndModule are amplified, band pass filtered and finally converted to DCby a detector diode. Each receiver has two identical branchesfollowing the differential scheme of the Planck radiometers. The BEMdesign is based on MMIC Low Noise Amplifiers using GaAs P-HEMTdevices, microstrip filters and Schottky diode detectors. Theirmanufacturing development has included elegant breadboard prototypesand finally qualification and flight model units. Electrical,mechanical and environmental tests were carried out for thecharacterization and verification of the manufactured BEMs. Adescription of the 30 and 44 GHz Back End Modules of Planck-LFIradiometers is given, with details of the tests done to determinetheir electrical and environmental performances. The electricalperformances of the 30 and 44 GHz Back End Modules: frequencyresponse, effective bandwidth, equivalent noise temperature, 1/f noiseand linearity are presented.
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