Planck-LFI CPV: front end amplifier bias HYM_TUNING
Date Issued
2009
Author(s)
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Davis, Richard
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Wilkinson, Althea
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Franceschet, Cristian
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GREGORIO, Anna
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Leonardi, Rodrigo
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Lowe, Stuart
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Meinhold, Peter
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Mendes, Luis
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Poutanen,Torsti
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Tomasi, Maurizio
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Zonca, Andrea
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Pearson, Dave
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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 add, 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
Volume
PL-LFI-PST-RP-068
Rights
open.access
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