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Noriko Y. YAMASAKI Yoh TAKEI Kensuke MASUI Kazuhisa MITSUDA Toshimitsu MOROOKA Satoshi NAKAYAMA
In frequency-domain multiplexing (FDM) for TES signals, a magnetic field summation method utilizing a multi-input SQUID has the fundamental merit of small degradation of the signal-to-noise ratio. We formulated shifts of the operation point due to a common impedance and cross talk currents. These effects are evaluated for several FDM methods, and the requirements for the bandwidth and filters are summarized. The design parameters of multi-input SQUIDs and a flux locked loop driving circuits are also presented.