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A Time Domain Multiplexer for Large Arrays of High Impedance Low Temperature Bolometers


We present a time domain multiplexer for high impedance bolometer arrays. It is based on the use of quantum-point-contact high-electron-mobility-transistors (QPC-HEMTs) as low temperature switches and a cold FET amplifier with programmable auto-zero-circuit. We employ the high bolometer resistance (about 10 MΩ) in parallel with a capacitance as antialiasing filter. A new generation of QPC-HEMT reaches a noise level close to the expected one. We will use this approach to multiplex the pixels of a mm-wave bolometric camera destined for the 30 meter IRAM telescope at Pico Veleta.

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Correspondence to C. Hoffmann.

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Benoit, A., Yates, S.J.C., Grémion, E. et al. A Time Domain Multiplexer for Large Arrays of High Impedance Low Temperature Bolometers. J Low Temp Phys 151, 940–945 (2008).

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  • LTD
  • Low temperature electronics
  • Detector arrays
  • Multiplexing


  • 07.57.Kp
  • 84.30.-r