Planck-LFI 44 GHz back end module

Planck-LFI 44 GHz back end module

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 microst...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems Vol. 41; no. 4; pp. 1415 - 1430
Main Authors: Aja, B., Pascual, J.P., De La Fuente, L., Detratti M, Artal, E., Mediavilla, A., De Paco P, Pradell i Cara, L.
Format: Journal Article
Language:English
Published: New York IEEE 01-10-2005
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Aircraft components
Amplifiers
Assembly
Bandwidth
Boundary element method
Broadband amplifiers
Frequency measurement
Gallium arsenide
Instruments
Low frequencies
Low-frequency noise
Low-noise amplifiers
Mathematical analysis
Modules
Noise
Noise measurement
PHEMTs
Radiofrequency amplifiers
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9251
1557-9603
DOI:10.1109/TAES.2005.1561893