Improved Design of Integrated Quantum Voltage Noise Source
Improved Design of Integrated Quantum Voltage Noise Source
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DOI：
10.1109/tasc.2016.2525990
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发表时间：
2016-02
影响因子：
1.8
通讯作者：
M. Maezawa;Takahiro Yamada;C. Urano
中科院分区：
文献类型：
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作者：
M. Maezawa;Takahiro Yamada;C. Urano
我们提出了一个集成的量子电压噪声源（IQVNS）的设计改进，旨在低成本，用户友好的约翰逊噪声温度计的高精度。在我们之前的IQVNS设计中的一个问题主要与低频和高频时钟信号的松散同步有关，这使得整个系统变得复杂且鲁棒性较差。我们采用了片上生成的低频时钟，通过下变频的高频参考时钟，使整个IQVNS工作在一个单一的时钟。为了获得更宽的时序裕度，在芯片级和子系统级流水线中都引入了逆流时钟结构。改进后的IQVNS已被制作通过使用我们的标准的异质结技术，并成功地进行了测试。
We present the design improvement of an integrated quantum voltage noise source (IQVNS) aimed at low-cost user-friendly Johnson noise thermometers with high accuracy. A problem in our previous design of the IQVNS was mainly associated with lax synchronization with low- and high-frequency clock signals, making the whole system complicated and less robust. We have employed on-chip generation of low-frequency clocks by downconverting a high-frequency reference clock so that the whole IQVNS operates with a single clock. Counterflow-clocking architecture has been introduced both in chip- and subsystem-level pipelines for achieving wider timing margins. The improved IQVNS has been fabricated by using our standard niobium-junction technology and successfully tested.