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SRON is developing the Frequency Domain Multiplexing (FDM) readout and theultra low NEP TES bolometers array for the infrared spectrometer SAFARI onboard of the Japanese space mission SPICA. The FDM prototype of the instrumentrequires critical and complex optimizations. For single pixel characterizationunder AC bias we are developing a simple FDM system working in the frequencyrange from 1 to 5 MHz, based on the open loop read-out of a linearizedtwo-stage SQUID amplifier and high Q lithographic LC resonators. We describethe details of the experimental set-up required to achieve low power loading (<1 fW) and low noise (NEP $\sim 10^{-19} W/Hz^{1/2}$) in the TES bolometers. Weconclude the paper by comparing the performance of a $4 \cdot 10^{-19}W/Hz^{1/2}$ TES bolometer measured under DC and AC bias.

journal of low temperature physics

AC bias characterization of low noise bolometers for SAFARI using an  Open-Loop Frequency Domain SQUID-based multiplexer operating between 1 and 5  MHz