Superconducting quantum interference device as a near-quantum-limited amplifier at 0.5 GHz
Superconducting quantum interference device as a near-quantum-limited amplifier at 0.5 GHz
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DOI：
10.1063/1.1347384
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发表时间：
2001-02-12
影响因子：
4
通讯作者：
Clarke, J
中科院分区：
文献类型：
--
作者：
Mück, M;Kycia, JB;Clarke, J
一个带谐振微带输入的直流超导量子干涉器件（SQUID）在温度低至20mk时作为放大器工作。另一个SQUID用作后放大器。在100 mK以下，538 MHz时的噪声温度为52 +/- 20 mK，这是根据信噪比的测量结果估计的，在519 MHz时的噪声温度为47 +/- 10 mK，这是根据与输入耦合的谐振电路产生的噪声估计的。量子极限噪声温度分别为26和25 mK。测量噪声温度受到偏置电流产生的热电子的限制。(C) 2001年美国物理研究所。
A dc superconducting quantum interference device (SQUID) with a resonant microstrip input is operated as an amplifier at temperatures down to 20 mK. A second SQUID is used as a postamplifier. Below about 100 mK, the noise temperature is 52 +/- 20 mK at 538 MHz, estimated from measurements of signal-to-noise ratio, and 47 +/- 10 mK at 519 MHz, estimated from the noise generated by a resonant circuit coupled to the input. The quantum-limited noise temperatures are 26 and 25 mK, respectively. The measured noise temperature is limited by hot electrons generated by the bias current. (C) 2001 American Institute of Physics.