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The PLANCK mission of the European Space Agency is devoted to produce sky maps of the cosmic microwave background radiation. The low-frequency instrument is a wide-band cryogenic microwave radiometer array operating at 30, 44, and 70 GHz. The design, test techniques, and performance of the complete differential radiometer at 30 GHz are presented. This(More)
We present the current status of the QUIJOTE (Q-U-I JOint TEnerife) CMB Experiment, a new instrument which will start operations early 2009 at Teide Observatory, with the aim of characterizing the polarization of the CMB and other processes of galactic and extragalactic emission in the frequency range 10-30 GHz and at large angular scales. QUIJOTE will be a(More)
This paper presents the analysis, design, and characterization of the thirty gigahertz instrument receiver developed for the Q-U-I Joint Tenerife experiment. The receiver is aimed to obtain polarization data of the cosmic microwave background radiation from the sky, obtaining the Q, U, and I Stokes parameters of the incoming signal simultaneously. A(More)
The 26–36 GHz receiver for a radio astronomy radiometer, to characterize the polarization of the Cosmic Microwave Background, is presented. This receiver is based on very low noise cryogenically cooled amplifiers in the front-end module, while in the back-end module a broadband amplification and direct detection chain is operated at room temperature.(More)
The stability of microwave amplifiers is normally analysed as a two port network. An amplifier has at least a third port for biasing that might be considered for stability. Bias line impedances can lead to oscillations in amplifiers. Full stability analysis of a millimetre wave MMIC amplifier has been carried out using a three port scattering parameter(More)
A GaN high electron mobility transistor technology with a gate length of 0.25 μm has been used to design and fabricate a cascode broadband low noise amplifier (LNA). The two-stage monolithic microwave integrated circuit (MMIC) with feedback topology yields a bandwidth of 0.5-3 GHz at a constant gain of 35 dB and noise figures of less than 1.5 dB. A(More)
This paper presents preliminary polarization measurements and systematic-error characterization of the Thirty Gigahertz Instrument receiver developed for the QUIJOTE experiment. The instrument has been designed to measure the polarization of Cosmic Microwave Background radiation from the sky, obtaining the Q, U, and I Stokes parameters of the incoming(More)
Modern communication and radar systems show an increasing demand for robust ultra-broadband amplifiers for low-noise applications. A set of three different 0.5 GHz to 20 GHz MMIC LNAs using a GaN HEMT technology with a gate length of 0.25 μm was designed and fabricated, each with a noise figure between 3 dB and 7 dB over frequency. Two designs with(More)
A comparison between simulated and measured results in different subsystems of a radio astronomy polarimeter receiver at 26-36 GHz band is presented. This comparison underlines the importance of careful simulation with different electromagnetic software tools in order to predict the receiver behavior. The receiver obtains three (Q, U and I) Stokes(More)