Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System
Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System
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DOI：
10.1109/tasc.2012.2230679
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发表时间：
2013-01
影响因子：
1.8
通讯作者：
K. Aoki;Y. Yamanashi;N. Yoshikawa
中科院分区：
文献类型：
--
作者：
K. Aoki;Y. Yamanashi;N. Yoshikawa
研究了基于单通量量子（SFQ）读出电路的多通道光纤传感系统的时分复用（TDM）和码分复用（CDM）技术。来自MEMS传感器阵列的输出数据可以使用SFQ二进制计数器进行多路复用，SFQ二进制计数器对来自每个传感器的SFQ脉冲的数量进行计数，并使用少量线路将其从低温环境传输到室温设备。我们已经估计和比较的多通道的TDM和CDM的基础上的模拟电路仿真和电路设计结果的传感系统的性能。TDM对于减少线路数量是有用的，但是感测系统的压摆率随着通道数量的增加而降低。另一方面，在CDM的情况下，系统的转换速率不随通道数量的增加而降低。我们设计并测试了一个双通道数字超导量子干涉仪系统，该系统采用SFQ上/下二进制计数器，可以进行TDM和CDM。在这两个电路中，16个Φ0输入波形从测量数据中重建，误差小于通量量子Φ0。
Time division multiplexing (TDM) and code division multiplexing (CDM) have been investigated for multichannel superconductive sensing systems using single-flux-quantum (SFQ) readout circuits. Output data from a superconductive sensor array can be multiplexed using SFQ binary counters, which count the number of SFQ pulses from each sensor, and are transmitted from a low-temperature environment to a room-temperature equipment using a small number of lines. We have estimated and compared the performance of a multichannel superconductive sensing system that employs TDM and CDM on the basis of analog circuit simulation and circuit design results. TDM is useful for reducing the number of lines, but the slew rate of the sensing system decreases with an increase in the number of channels. On the other hand, in the case of CDM, the slew rate of the system does not decrease with an increase in the number of channels. We have designed and tested a 2-channel digital superconducting quantum interference device system that can perform TDM and CDM employing SFQ up/down binary counters. In both circuits, the 16 Φ0 input waveforms were reconstructed from the measured data, with an error of less than the flux quantum Φ0.