Dynamic behavior of dc SQUIDs in time-division multiplexing readout schemes

被引：11

作者：

Heinz, E. ^{[1
]}

Zakosarenko, V. ^{[1
]}

May, T. ^{[1
]}

Meyer, H. G. ^{[1
]}

机构：

[1] Inst Photon Technol, D-07745 Jena, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2013年 / 26卷 / 04期

关键词：

TRANSITION-EDGE SENSORS;

D O I：

10.1088/0953-2048/26/4/045013

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the transient response of superconducting quantum interference devices (SQUIDs) used in time-division multiplexing schemes for the readout from arrays of superconducting transition-edge sensors (TES). In time-division multiplexing the per channel settling time is an important parameter since it limits the multiplexing frequency as well as the signal-to-noise ratio. Although SQUIDs in general are fast cryoelectronic devices operating at a nanosecond scale, experimental evidence shows that the settling time in bias-switched SQUID multiplexers can, in the case of a low impedance input circuit, reach several microseconds. We have confirmed this behavior through numerical transient analysis using a Josephson circuit simulator. Within the simulation we have found that the transient response can be reduced using an extra inductor in series with the input coil of the dc SQUID. This result in turn has been confirmed experimentally. We furthermore discuss the conflicting constraints that a desired high signal bandwidth places on the parameters of the multiplexer, the readout SQUIDs, and the TES.

引用

页数：6

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