The SPICA-SAFARI instrument requires extremely sensitive transition edge sensor (TES) arrays with a noise equivalent power of $$2 \times 10^{ - 19} \;{\text{W/}}\sqrt {\text{Hz}}$$ 2 × 10 - 19 W/ 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 $$5.4\;{\text{pA/}}\sqrt {\text{Hz}}$$ 5.4 pA/ Hz and $$315\;{\text{pV/}}\sqrt {\text{Hz}}$$ 315 pV/ Hz , respectively, which are low enough to read out SAFARI’s TES arrays.

中文翻译：

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SAFARI FDM 读出系统中低噪声放大器的噪声测量

SPICA-SAFARI 仪器需要极其灵敏的过渡边缘传感器 (TES) 阵列，噪声等效功率为 $2 \times 10^{ - 19} \;{\text{W/}}\sqrt {\text{Hz}} $$ 2 × 10 - 19 W/Hz 以及输出噪声主要由检测器噪声控制的读出系统。确保 SAFARI 中的频域复用 (FDM) 读出系统满足噪声要求至关重要。SAFARI 中的 FDM 系统主要由 LC 滤波器、超导量子干涉装置、室温低噪声放大器 (LNA) 和解复用器组成。在这里，我们展示了实验室放大器链中 LNA 的噪声研究。我们发现 LNA 的等效电流和电压噪声为 $$5.4\;{\text{pA/}}\sqrt {\text{Hz}}$$ 5.4 pA/ Hz 和 $$315\;{\text{pV /}}\sqrt {\text{Hz}}$$ 315 pV/ Hz ，分别为