I have experimented with a SiGe heterojunction transistor
at 4.2 K acting as a readout amplifier for dc SQUIDs.
Flux noise level of 0.35 0 / Hz was reached with one
SQUID type. Slew rate of 1.7 107 0/s was observed with
another SQUID type in a flux feedback arrangement having
a calculated >108 0/s slew rate. The SiGe transistor
dissipated 9 mW at 4.2 K, but dissipation levels in the
0.1 mW range appear feasible.
|Series||ESA Conference Proceedings|
|Workshop||7th International Workshop on Low Temperature Electronics, WOLTE-7|
|Period||21/06/06 → 23/06/06|