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Journal of Low Temperature Physics 151, 3-4 (2008) 1028-1033
Very Low Noise Multiplexing with SQUID and SiGe HBTs For Readout of Large Superconducting Bolometer Arrays
F. Voisin1, E. Bréelle1, M. Piat1, D. Prêle1, Geoffroy Klisnick2, Gérard Sou2, Michel Redon2

This paper presents an ultra low noise instrumentation based on a standard BiCMOS SiGe 0.35 μm ASIC operating at cryogenic temperatures. The main functions of the electronic circuit are the readout and the multiplexing of SQUIDs/TES. We report the cryogenic operation of the ASIC dedicated to the readout of a 2×4 pixel demonstrator array. We particularly emphasize on the development and the test phases of an ultra low noise (0.2 nV/sqrt Hz) cryogenic amplifier designed with two multiplexed inputs. The cryogenic SiGe amplifier coupled to a SQUID in a FLL operating at 4.2 K is also presented
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  L2E - Laboratoire d'Electronique et Electromagnétisme
APC - Cosmologie et Gravitation
Sciences de l'ingénieur/Micro et nanotechnologies/Microélectronique
Cryoelectronics – Instrumentation – SQUID systems Bolometers – Low noise amplifier – SiGe BiCMOS analog integrated circuits