Large gain, negative resistance, and oscillations in superconducting quasiparticle heterodyne mixers

Large gain, negative resistance, and oscillations in superconducting quasiparticle heterodyne mixers
复制标题

超导准粒子外差混频器中的大增益、负电阻和振荡

DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
P. Santhanam
P. Santhanam
中科院分区：
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文献类型：
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作者：
W. R. McGrath;P. Richards;A. D. Smith;H. Kempen;R. Batchelor;D. Prober;P. Santhanam

文献摘要

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我们测量了在量子极限下运行的超导体-绝缘体-超导体准粒子混合器的性质。当混合噪声温度T = 9±6 K时，在36 GHz频率下观察到单边带转换增益大于+4 dB，并与（普朗克）量子极限h/ω/(K ln 2)≃2.5 K进行了比较。完整的三端口混频器计算结果与增益测量结果非常吻合。观察到，随着源电导的减小，动态电阻变为无穷大，然后变为负值。这意味着可以获得任意大的增益。负电阻伴随着中频振荡。
We have measured the properties of a superconductor‐insulator‐superconductor quasiparticle mixer which is operated in the quantum limit. Single sideband conversion gain larger than +4 dB was observed at 36 GHz with a mixer noise temperature T = 9±6 K, which is to be compared with the (Planck) quantum limit h/ω/(k ln 2)≃2.5 K. Complete three‐port mixer calculations are presented which are in good agreement with the gain measurements. The dynamic resistance was observed to become infinite and then negative as the source conductance was decreased. This implies that arbitrarily large gain is available. The negative resistance is accompanied by IF oscillations.