1159039
doi
10.5281/zenodo.1159039
oai:zenodo.org:1159039
user-atlast2018
Finger, R.
University of Chile
Baryshev, A. M.
NOVA/Kapteyn
Mena, F. P.
University of Chile
Rodriguez, R.
University of Chile
Hesper, R.
NOVA/Kapteyn
Fuentes, R.
University of Chile
Bronfman, L.
University of Chile
Study of the calibration channel width for a Digital Sideband Separating system for SIS 2SB receiver
Khudchenko, Andrey
NOVA/Kapteyn Institute, The Netherlands
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
A Digital Sideband Separating (DSS) system has been recently applied to a full 2SB receiver, i.e., one with the analog IF hybrid still in place. This concept allows reaching IRR level around 45 dB and it presents additional advantages in calibration stability compared to the case when no IF hybrid is present. If implemented in multipixel cameras, the DSS system relaxes the requirements for the IRR level of the analog receiver substantially enabling to reach at least an IRR of 30 dB with relatively simple hardware. It would be ideal for spectral line surveys since it practically eliminates the line confusion in addition to rejecting the atmospheric noise in the image band. Therefore, the DSS system is a potential option for a future ALMA upgrade. Here we present our study on an important practical question: how wide should the calibration-channel width in order to reach a desired IRR level? This parameter determines, for a large part, the calibration speed of the DSS system and influences the back-end architecture. We estimate that for currently installed ALMA bands (B3-B8), the channel width of the DSS system can be at least 45 MHz to reach a 30db IRR level in entire band.
Zenodo
2018-01-25
info:eu-repo/semantics/conferencePoster
1159038
user-atlast2018
1579541897.613016
2322590
md5:c01781af50623e54bb45a2a2b574b425
https://zenodo.org/records/1159039/files/AtLAST_Poster_Khudchenko.pdf
public
10.5281/zenodo.1159038
isVersionOf
doi