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Planck-LFI 44-GHz back end module
Aja, Beatriz; Pascual, Juan Pablo; Fuente, Luisa de la; Detratti, M.; Artal Latorre, Eduardo; Mediavilla, Asier; Paco Sánchez, Pedro Antonio de; Pradell i Cara, Lluís
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones
This work describes the principle of operation, assembly and performance of one branch of the 44 GHz back end module (BEM) for the Planck low frequency instrument (LFI). This subsystem constitutes a fully representative branch of the qualification-model version (QM). It includes waveguide to microstrip transition, GaAs pseudomorphic high electron mobility transistor (PHEMT) low noise amplifiers (LNA), bandpass filter, square-law detector and dc amplifier. The fundamentals of the design of the RF part are described and all of the components have been tested individually before integration. Using single tone and wideband noise stimuli, the output voltage has been measured for several input powers, in order to obtain the sensitivity factor of the complete BEM. The effective bandwidth and the equivalent noise temperature have been calculated from the measurements, taking into account the frequency dependence on the noise source and the BEM. Finally, the low frequency output power spectrum has been obtained and a maximum 1/f knee frequency around 200 Hz has been measured with a 3 dB output signal video bandwidth above 50 KHz.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Adquisició i detecció del senyal
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció
Amplifiers, Radio frequency
III-V semiconductors
aerospace instrumentation
band-pass filters
gallium arsenide
high electron mobility transistors
low noise amplifiers
radiofrequency cosmic radiation
waveguide transitions
Ones -- Guies
Amplificadors de baixa freqüència

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