Sideband-separating MMIC receivers for observation in the 3-mm band
Abstract
Wideband receivers for the 3-mm band were developed for CARMA, the Combined Array for Research in Millimeterwave Astronomy. Three cryogenic MMIC (monolithic microwave integrated circuit) amplifiers manufactured in InP 35- nm technology are combined in a block with waveguide probes and gain equalizers to cover the 80–116 GHz band. These are followed by a sideband-separating mixer that has two 17 GHZ wide outputs, for upper and lower sidebands. Each receiver has a feed horn followed by a circular-to-linear polarizer and orthomode transducer. The two polarizations are amplified by the cryogenic MMICs, and the outputs downconverted in sideband separating mixers, resulting in four 1–18 GHz channels that can be simultaneously correlated. The first receiver was tested in the lab, and on-sky tests conducted at CARMA. Measured noise temperatures were in the range 40–70 K, with a sideband rejection of about 15 dB.
Additional Information
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). We would like to acknowledge the invaluable work done by Mr. Stan Hudson at the Owens Valley Observatory machine shop in machining many of the parts described here. In particular, it took great perseverance to refine the process for machining the slots for the quadrature hybrids. Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. CARMA development and operations were supported by the National Science Foundation under a cooperative agreement (grant AST-1140063), and by the CARMA partner universitiesAttached Files
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Additional details
- Eprint ID
- 72002
- Resolver ID
- CaltechAUTHORS:20161114-151435470
- Gordon and Betty Moore Foundation
- Kenneth T. and Eileen L. Norris Foundation
- James S. McDonnell Foundation
- Caltech Associates
- University of Chicago
- State of California
- AST-1140063
- NSF
- CARMA partner universities
- State of Illinois
- State of Maryland
- Created
-
2016-11-15Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 9914