The SBRC-190 a cryogenic multiplexer for moderate-background FIR astronomy
The SBRC-190 a cryogenic multiplexer for moderate-background FIR astronomy
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SBRC-190 是一款用于中背景 FIR 天文学的低温多路复用器
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
N. Lum
中科院分区：
文献类型：
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作者：
E. Erickson;E. Young;J. Wolf;J. Asbrock;N. Lum
sbrc190是一种低温多路复用器，用于在中等背景下工作的远红外（FIR）光导体探测器。该电路是基于32通道CRC 696 CMOS器件上使用的SIRTF。对于在SOFIA或Herschel上遇到的应用，新设备允许更高的背景，更宽的背景范围，更快的采样，并增强采样与斩波的同步。导出了采样效率与实现背景受限仪器（BLIP）性能所需的噪声要求之间的关系。与SBRC 190中包含的CRC 696相比，主要的设计差异是：(a)交流耦合，电容反馈跨阻单元，以最大限度地减少输入偏移效应，从而实现低检测器偏差；(b)可选择的反馈电容器，使其能够在大范围的背景下工作；(c)钳位和采样保持输出电路，以提高采样效率，这是需要相对较高的读出率的一个问题。本文着重介绍了SOFIA的使用要求，并讨论了新型多路复用器的设计、预期性能和制作方法。
The SBRC 190, a cryogenic multiplexer developed for far-infrared (FIR) photoconductor detectors operating at moderate backgrounds, is described. The circuit is based on the 32-channel CRC 696 CMOS device used on SIRTF. For applications such as encountered on SOFIA or Herschel, the new device permits higher backgrounds, a wider range of backgrounds, faster sampling, and enhanced synchronization of sampling with chopping. A relationship between sampling efficiency and noise requirements needed to achieve background-limited instrument (BLIP) performance is derived. Major design differences relative to the CRC 696 which have been incorporated in the SBRC 190 are: (a) an AC coupled, capacitive feedback transimpedance unit cell, to minimize input offset effects, thereby enabling low detector biases, (b) selectable feedback capacitors to enable operation over a wide range of backgrounds, and (c) clamp and sample & hold output circuits to improve sampling efficiency, which is a concern at the relatively high readout rates required. The paper emphasizes requirements for use on SOFIA, and touches on the design, expected performance, and fabrication of the new multiplexer.