GaAs-JFET cryogenic readout electronics for the superconducting terahertz digital camera

We have developed GaAs-JFET based cryogenic readout electronics for high impedance detectors such as superconducting tunnel junction detectors which operate at cryogenic temperature at less than 1 K. The readout electronics consists of AC-coupled capacitive trans-impedance amplifiers, sample-and-holds, multiplexers and shift-registers. GaAs-JFET integrated circuits have been fabricated to realize 32-channel readout modules.