Abstract
In a magnetic summation method, TES and SQUID driving circuits are isolated and thus small crosstalk and stray impedance are expected. Since a FLL circuit with a large bandwidth and a small noise level is required for a SQUID, we designed and produced an electronics to meet our design of multiplexing with an 8-input SQUID. The FLL circuit achieved an open loop-gain bandwidth product of 8 MHz with 1 m wire length, which is enough for a TES to be operated with a bias current of 70 μ A , and a noise level of 30 pA / Hz .
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