ISSTT Proceedings

ISSTT Proceedings

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Millimeter and Submillimeter SIS Mixers with the Noise Temperature Close to the Quantum Limit

Authors:
A. Karpov, J. Blondel, B. Lazareff, K.H. Gundlach
Abstract:
We report the ultra low noise SIS mixers built for the radio astronomy at millimeter wavelength (1.3 mm) and at submillimeter wavelength (0.8 mm). Mixers sensitivity is found to be close to one photon. A mixer with the superconducting tunnel diode developed for 0.8 mm receiver is able to operate in 290-370 GHz band been fixed tuned. The receiver minimum DSB noise temperature of about 30 K corresponds to the 1.9hv/k level. Expressing this noise (or sensitivity) in photon number we get the four photons level. Measured mixer noise temperature in this receiver is about 10 K equal to 0.6hv/k level. This receiver has been used for the observation in the winter 1994 period at 30 m IRAM radio telescope at Pico Veleta. Telescope system noise temperature of 500 K SSB has been achieved when the opacity was about 0.17. In 1.3 mm band the minimum receiver noise is 32 K DSB (2.9hv/k level). Measured mixer DSB noise temperature is about 5 K(0.5hv/k level).
Categories:
SIS Receivers
Year:
1994
Session:
1
Full-text:
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Page Number(s):
73-83