Arrays of cryogenic microbolometers and other cryogenic detectors are being developed for infrared imaging . If the signal from each sensor is amplified , multiplexed , and digitized using superconducting electronics , then this data can be efficiently read out to ambient temperature with a minimum of noise and thermal load . HYPRES is developing an integrated system based on SQUID amplifiers , a high - resolution analog - to - digital converter ( ADC ) based on RSFQ ( rapid single flux quantum ) logic , and a clocked RSFQ multiplexer . The ADC and SQUIDs have already been demonstrated for other projects , so this paper will focus on new results of a digital multiplexer . Several test circuits have been fabricated using Nb Josephson technology and are about to be tested at T = 4.2 K , with a more complete prototype in preparation .