Development of MMIC receivers for cosmic microwave background interferometry
We report on the development of some of the key technologies that will be needed for a large-format Cosmic Microwave Background (CMB) interferometer with many hundreds of wideband W-band (75-110 GHz) receivers. A scalable threebaseline prototype interferometer is being assembled as a technology demonstration for a future ground- or space-based instrument. Each of the prototype heterodyne receivers integrates two InPMonolithic Microwave Integrated Circuit (MMIC) low-noise amplifiers, a coupled-line bandpass filter, a subharmonic balanced diode mixer, and a 90° local oscillator phase switch into a single compact module that is suitable for mass production. Room temperature measurements indicate bandaveraged receiver noise temperatures of 500 K from 85-100 GHz. Cryogenic receiver noise temperatures are expected to be around 50 K.
Additional Information© 2010 SPIE. The authors would like to thank Matt Morgan for providing the mixer design that was used in the prototype receivers, Eric Bryerton for designing one of the LNAs, Keith Grainge, Andrew Harris, Michael Jones, Tim Pearson, and Angela Taylor for useful discussions about interferometry, Glen Nixon, Suzanne Staggs, and Ed Wollack for useful dialogue about split block polarizers, Dan Werthimer for discussions on correlators, Heather Owen for invaluable help in assembling receiver components, and Rodrigo Reeves for discussions on noise measurements. This work was supported by the National Aeronautics and Space Administration Strategic University Research Partnership and the SLAC Laboratory Directed Research and Development Program. This work was supported by Department of Energy contract DE-AC03-76SF00515. P.V. thanks the Harriett G. Jenkins Pre-doctoral Fellowship Program for their support.
Published - 77412I_1.pdf