The use of a multiplexing readout for an array of bolometers simplifies the electronics and wiring, so making the readout of large arrays of bolometers feasible. Here we describe a time domain multiplexing technique and its performance based on the use of quantum-point-contact high-electron-mobility-transistors as low temperature (to ) switches for measuring high impedance resistances and sensors. The presented system is well matched to ground based millimetric astronomy demands.
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