Abstract
70 GHz radiometer front-end and back-endmodules for the Low Frequency Instrument of the European SpaceAgency's Planck Mission were built and tested. Theoperating principles and the design details of the mechanicalstructures are described along with the key InP MMIC low noiseamplifiers and phase switches of the units. The units were tested inspecially designed cryogenic vacuum chambers capable of producing theoperating conditions required for Planck radiometers, specifically, aphysical temperature of 20 K for the front-end modules, 300 K for theback-end modules and 4 K for the reference signal sources. Test resultsof the low noise amplifiers and phase switches, the front and back-endmodules, and the combined results of both modules are discussed. At 70 GHz frequency, the system noise temperature of the front and backend is 28 K; the effective bandwidth16 GHz, and the 1/f spectrum knee frequency is38 mHz.The test results indicatestate-of-the-art performance at 70 GHz frequency and fulfil the Planckperformance requirements.
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