Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-23
Proceedings of Conftele 2007, an IT and IEEE sponsored Conference, May 2007, Peniche, Portugal
Astronomy and Astrophysics
Astrophysics
accepted for publication and presentation at Conftele 2007, an IT and IEEE sponsored Conference (www.it.pt/conftele2007)
Scientific paper
In the context of the Galactic Emission Mapping collaboration, a galactic survey at 5GHz is in preparation to properly characterize the galactic foreground to the Cosmic Microwave Background Radiation (CMBR). For the North sky survey, a new receiver is being developed. This 5GHz heterodyne polarimeter has a high gain IF (intermediate frequency) chain using the latest RF technology and microstrip design that we describe in the present article. Working at 600MHz central frequency, it consists of a pre-amplifier with an integral band-pass filter followed by an amplifier with digitally controlled gain and a frequency converter to zero-IF that feeds the ADC of a four channel digital correlator (outside the scope of the present article). This paper focuses the design options and constraints and presents the simulations and experimental results of a circuit prototype.
Barbosa Domingos
Bergano Miguel
Cupido Luis
Fonseca Rui
Santos Dinis M.
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