Noise Measurements of a Low-Noise Amplifier in the FDM Readout System for SAFARI

Qian Wang, Michael D. Audley, Pourya Khosropanah, Jan van der Kuur, Gert de Lange, Amin Aminaei, Dick Boersma, Floris van der Tak, Jian Rong Gao

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The SPICA-SAFARI instrument requires extremely sensitive transition edge sensor (TES) arrays with a noise equivalent power of 2×10-19W/Hz and a readout system with an output noise that is dominated by the detector noise. It is essential to ensure the frequency domain multiplexing (FDM) readout system in SAFARI meets the noise requirement. The FDM system in SAFARI consists essentially of LC filters, a superconducting quantum interference device, a room-temperature low-noise amplifier (LNA), and a demultiplexer. Here we present a noise study of the LNA from a laboratory amplifier chain. We found the equivalent current and voltage noise of the LNA to be 5.4pA/Hz and 315pV/Hz, respectively, which are low enough to read out SAFARI’s TES arrays.

Original languageEnglish
Pages (from-to)817-823
Number of pages7
JournalJournal of Low Temperature Physics
Issue number3-4
Publication statusPublished - 2020


  • Low-noise amplifier
  • Readout noise
  • Transition edge sensor


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