A cryo-amplifier working in a double loop-flux locked loop scheme for SQUID readout of TES detectors
A cryo-amplifier working in a double loop-flux locked loop scheme for SQUID readout of TES detectors
复制标题
采用双环磁通锁定环方案工作的低温放大器，用于 TES 探测器的 SQUID 读数
DOI：
10.1117/12.856430
复制
发表时间：
2010
影响因子：
1.4
通讯作者：
L. Colasanti
中科院分区：
文献类型：
--
作者：
G. Torrioli;P. Bastia;L. Piro;C. Macculi;L. Colasanti
在本文中，我们报告了一种新颖的 SQUID 读出方案，称为双环磁通锁定环 (DL-FLL)，我们正在 ASI 和 ESA 技术开发合同的框架内研究该方案。该方案基于低温放大器的实现，该放大器用于读出频分复用技术中的 TES 探测器，其中需要高达几 MHz 的高环路增益。由于反馈环路元件之间的距离，反馈系统中的环路增益通常受到环路中传播的信号的传播延迟的限制。这个问题在 SQUID 系统中尤其明显，其中反馈回路的元件同时放置在低温和室温下。为了解决这个问题，我们提出了一种能够在低温下工作的低功耗低温放大器，因此可以将其放置在靠近 SQUID 的位置，从而实现局部低温回路。采用DL-FLL方案可以大大简化低温放大器，该放大器是交流耦合的，不需要精密直流耦合放大器的特性，并且可以用有限数量的电子元件制成，从而降低功耗。
In this paper we report on a novel SQUID readout scheme, called Double Loop-Flux Locked loop (DL-FLL), that we are investigating in the frame of ASI and ESA technological development contracts. This scheme is based on the realization of a cryogenic amplifier which is used in order to readout TES detectors in the Frequency Division Multiplexing technique, where high loop-gain is required up to few MHz. Loop-gain in feedback systems is, usually, limited by the propagation delay of the signals traveling in the loop because of the distance between the feedback loop elements. This problem is particularly evident in the case of SQUID systems, where the elements of the feedback loop are placed both at cryogenic and room temperature. To solve this issue we propose a low power dissipation cryo-amplifier capable to work at cryogenic temperatures so that it can be placed close to the SQUID realizing a local cryogenic loop. The adoption of the DL-FLL scheme allows to simplify considerably the cryo-amplifier which, being AC-coupled, don't require the features of a precision DC-coupled amplifier and can be made with a limited number of electronic components and with a consequent reduction of power dissipation.