Title :
Development of Cryogenic IF Low-Noise 4-12 GHz Amplifiers for ALMA Radio Astronomy Receivers
Author :
López-Fernàndez, Isaac ; Puyol, Juan Daniel Gallego ; Gonzalez, Carmen Diez ; Cancio, Alberto Barcia
Author_Institution :
Centra Astronomico de Yebes, Observatorio Astronomico Nacional, Guadalajara
Abstract :
We describe the design and results of a wide band C-X cryogenic IF amplifier developed for band 9 (602-720 GHz) of ALMA radio telescopes. A cryogenic 4-12 GHz isolator is used at the input to improve matching. Several units have been fabricated and its results are presented. The amplifiers utilize HRL InP transistors to achieve a noise temperature of 5.3 K (0.08 dB NF) on average. Gain fluctuations are critical for the project. Values of Allan variance lower than 4.1 10-9 (0.1 s les T les 10 s) have been obtained
Keywords :
III-V semiconductors; cryogenic electronics; indium compounds; intermediate-frequency amplifiers; low noise amplifiers; microwave amplifiers; radiotelescopes; 4 to 12 GHz; 5.3 K; 602 to 720 GHz; ALMA; Allan variance; C-X cryogenic IF amplifier; HRL transistors; IF low-noise amplifiers; InP; MODFET amplifiers; broadband amplifier; cryogenic amplifier; cryogenic electronics; cryogenic isolator; matching improvement; radio astronomy receivers; radio telescopes; submillimeter wave receivers; Cryogenics; Impedance matching; Indium phosphide; Isolators; Low-noise amplifiers; Noise measurement; Optical design; Radio astronomy; Receivers; Temperature; Amplifier noise; IF amplifiers; MODFET amplifiers; broadband amplifier; cryogenic electronics; radio astronomy; submillimeter wave receivers;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249788
