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As ALMA nears completion, 73 dual-polarization receivers have been delivered for each of Bands 3 (84&#x2013;116 GHz) and 6 (211&#x2013;275 GHz). The receivers use sideband-separating superconducting tunnel-junction (SIS) mixers, developed for ALMA to suppress atmospheric noise in the image band. The mixers were designed taking into account input return loss, dynamic range and signal-to-image conversion (which can degrade the image rejection). Results are given for typical production receivers.

Development of the ALMA-North America sideband-separating SIS mixers