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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33261
Title: Planck-LFI CPV: front end amplifier bias HYM_TUNING
Authors: BATTAGLIA, Paola Maria 
Bersanelli, Marco
CUTTAIA, FRANCESCO 
Davis, Richard
Wilkinson, Althea
FRAILIS, Marco 
Franceschet, Cristian
FRANCESCHI, ENRICO 
GALEOTTA, Samuele 
GREGORIO, Anna 
Leonardi, Rodrigo
Lowe, Stuart
Mandolesi, NAZZARENO 
MARIS, Michele 
Meinhold, Peter
Mendes, Luis
MENNELLA, ANIELLO 
Poutanen,Torsti
SANDRI, MAURA 
TAVAGNACCO, Daniele 
TERENZI, LUCA 
Tomasi, Maurizio
VILLA, Fabrizio 
ZACCHEI, Andrea 
Zonca, Andrea
Issue Date: 2009
Number: PL-LFI-PST-RP-068
Abstract: This document describes the results from the Hyper-matrix tuning activities. The Tuning is aimed at finding the optimal bias setting for the LNAs exploring the bias space changing simultaneously the four Vg bias (4-dimensional hypermatrix) powering each radiometer. The hypermatrixes come from the pre-tuning results, drawing for each of the 22 radiometers the bias space around the bias quadruplets expected to produce the best performance ( noise temperature and Isolation) . Since Isolation could not intrinsically be measured with the pre-tuning method, Isolation was measured for the first time only at the end of the HYM–TUNING. In addition, for a subset (15 bias quadruplets for each radiometer) of values expected, from pre-tuning results, to provide the best performance, also the drain voltage is tuned following a matrix scheme, changing the Vd on both the ACAs of the same radiometer. Hence, for this subset of values, the tuning is performed over a six-dimensional hyper space.
Note: Planck LFI Commissioning and Performance Verification (CPV)
URI: http://hdl.handle.net/20.500.12386/33261
Fulltext: open
Appears in Collections:4.03 Rapporti di progetto

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