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The use of HEMTs in multiplexing large arrays of high impedance LTDs

✍ Scribed by S.J.C. Yates; A. Benoit; Y. Jin; Ph. Camus; A. Cavanna; T. Durand; B. Etienne; U. Gennser; E. Grémion; C. Hoffmann; S. Leclercq; Ch. Ulysse

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
147 KB
Volume
559
Category
Article
ISSN
0168-9002

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✦ Synopsis

The use of a multiplexing system in close proximity to the detectors simplifies the electronics associated with large arrays of Low Temperature Detectors (LTDs). Here, we report the demonstration of an array of Quantum-Point-Contact High-Electron-Mobility-Transistors (QPC-HEMTs) down to 100 mK used to time multiplex the signal from 8 simulated high impedance LTDs ð$10 MOÞ to an individual amplifier. Capacitors in parallel with the individual LTDs integrate the signal between measurements so giving a quasi-DC measurement of the LTDs. With the high impedance of the LTD this acts as a filter which counter acts the aliasing of the Johnson noise of the LTD associated with the time-multiplexing technique.

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