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Proceedings Paper

Wideband ultralow-noise cryogenic InP IF amplifiers for the Herschel mission radiometers
Author(s): Isaac Lopez-Fernandez; Juan Daniel Gallego-Puyol; Carmen Diez; Alberto Barcia; Jesus Martin-Pintado
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Paper Abstract

The sub-millimeter radiometers of the Herschel mission have very stringent requirements. The scientific goals require an instantaneous bandwidth of four GHz with very low noise, flat gain and low power dissipation. Short-term gain stability of the amplifier is important, because gain fluctuations could limit the sensitivity of the instrument. Besides, a highly reliable, low weight unit is required to be compatible with the space instrumentation standards. The amplifiers will be used in conjunction with HEB and SIS mixers in all 7 channels of the instrument. This paper describes the design, the special construction techniques and the results of the amplifiers built by Centro Astronómico de Yebes for the development model of the Herschel Heterodyne Instrument. The average noise temperature obtained in the 4-8 GHz band is 3.5 K, with a gain of 27 ±1.1 dB at an ambient temperature of 15 K and keeping the total power dissipation below the allowed 4 mW. Normalized gain fluctuations were carefully measured, being lower than 1.5·10-4 Hz-1/2 @ 1 Hz. Space qualification of the design is in progress.

Paper Details

Date Published: 17 February 2003
PDF: 12 pages
Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459177
Show Author Affiliations
Isaac Lopez-Fernandez, Observatorio Astronomico Nacional (Spain)
Juan Daniel Gallego-Puyol, Observatorio Astronomico Nacional (Spain)
Carmen Diez, Observatorio Astronomico Nacional (Spain)
Alberto Barcia, Observatorio Astronomico Nacional (Spain)
Jesus Martin-Pintado, Observatorio Astronomico Nacional (Spain)


Published in SPIE Proceedings Vol. 4855:
Millimeter and Submillimeter Detectors for Astronomy
Thomas G. Phillips; Jonas Zmuidzinas, Editor(s)

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