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首页> 外文期刊>IEEE Transactions on Magnetics >Josephson harmonic mixing and internal oscillation-mixing in YBCO superconducting weak link at liquid nitrogen temperatures
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Josephson harmonic mixing and internal oscillation-mixing in YBCO superconducting weak link at liquid nitrogen temperatures

机译：液氮温度下YBCO超导薄弱环节中的约瑟夫森谐波混合和内部振荡混合

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摘要

Using a superconducting weak link (bridge) made of YBCO, the authors have successfully observed Josephson harmonic mixing between a local oscillation (LO) at X band and a signal at Ka band. Specifically, fourth-order harmonic mixing between 35.47 GHz and 8.843 GHz was observed. For a given signal level, the IF (intermediate frequency) responses depended strongly on both LO level and DC voltage bias across the junction. For zero bias, there is still IF output which is characteristic of even-order harmonic mixing. When the LO power level is such that the zero voltage current is suppressed to the second zero, the IF responses are maximum if the junction is biased between the zeroth and first steps induced by the LO. Also studied is the internal oscillation-mixing. An incoming signal at either X or Ka band gives rise to IF signal peaks if the junction is biased at voltages such that the corresponding internal Josephson frequencies are equal to, or harmonics of, the incoming signal frequency.
机译：通过使用由YBCO制成的超导弱链接（电桥），作者已经成功地观察到X波段的局部振荡（LO）和Ka波段的信号之间的约瑟夫森谐波混合。具体而言，观察到35.47 GHz和8.843 GHz之间的四阶谐波混合。对于给定的信号电平，IF（中频）响应很大程度上取决于LO电平和结两端的DC偏置电压。对于零偏置，仍然存在中频输出，这是偶次谐波混频的特征。当LO功率电平使零电压电流被抑制到第二个零时，如果结在LO引起的第零步和第一步之间偏置，则IF响应最大。还研究了内部振荡混合。如果结以一定的电压偏置，则X或Ka频带上的输入信号会产生IF信号峰值，以使相应的内部约瑟夫森频率等于或等于输入信号频率的谐波。

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