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A Microwave SQUID Multiplexer Optimized for Bolometric Applications

APPLIED PHYSICS LETTERS(2021)

Univ Colorado | SLAC Natl Accelerator Lab | Univ Calif San Diego | NIST | Princeton Univ | Stanford Univ

Cited 28|Views117
Abstract
A microwave SQUID multiplexer ($\mu$MUX) has been optimized for coupling to large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic multiplexer chip design in a 1820-channel multiplexer configuration for the 4-8 GHz rf band. The key metrics of yield, sensitivity, and crosstalk are determined through measurements of 455 readout channels, which span 4-5 GHz. The median white-noise level is 45 pA/$\sqrt{\textrm{Hz}}$, evaluated at 2 Hz, with a 1/f knee $\leq$ 20 mHz after common-mode subtraction. The white-noise level decreases the sensitivity of a TES bolometer optimized for detection of the cosmic microwave background at 150 GHz by only 3%. The measured crosstalk between any channel pair is $\leq$ 0.3%.
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Key words
Microwave SQUID Multiplexers,Transition-Edge Sensors,Millimeter-Wave,Substrate Integrated Waveguide,Millimeter-Wave Applications
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要点】:本文优化了一种微波SQUID多路复用器,用于耦合到大量超导过渡边缘传感器(TES)热 bolometer 阵列,实现了在4-8 GHz射频频段内的1820路复用配置,提高了产量、灵敏度和串扰性能。

方法】:通过测量455个读出通道的性能,这些通道覆盖了4-5 GHz,确定了关键指标。

实验】:实验采用了一个可扩展的低温多路复用器芯片设计,在4-8 GHz射频频段内对1820路信号进行多路复用。结果显示,经过共模减法后,中位数白色噪声水平为45 pA/$\sqrt{\text{Hz}}$(在2 Hz处评估),1/f膝盖值$\leq$ 20 mHz。该多路复用器的白色噪声水平仅使针对150 GHz宇宙微波背景探测优化的TES bolometer的灵敏度下降了3%。任意通道对之间的测量串扰$\leq$ 0.3%。