A low-noise, two-stage DC SQUID amplifier with high bandwidth and dynamic range
A low-noise, two-stage DC SQUID amplifier with high bandwidth and dynamic range
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DOI：
10.1109/77.621971
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发表时间：
1997-06
影响因子：
1.8
通讯作者：
R. Cantor;L.P. Lee;A. Matlashov;V. Vinetskiy
中科院分区：
文献类型：
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作者：
R. Cantor;L.P. Lee;A. Matlashov;V. Vinetskiy
我们描述了一种低噪声、两级直流超导量子干涉器件 (SQUID) 放大器，该放大器专为需要高带宽和动态范围的应用而设计。输入级中低噪声SQUID的输出信号通过公共调制线对输出级中一系列相同的SQUID进行相干调制。输入级的设计使其输出信号不会在输出级中产生多个调制周期。输出级被设计为具有足够的增益，因此输出噪声主要由输入 SQUID 的放大噪声主导，并且超过室温读出电子器件中前置放大器的噪声。因此，SQUID放大器可以在没有通量调制或任何阻抗匹配网络的情况下运行，从而产生大动态范围和高带宽。
We describe a low-noise, two-stage dc Superconducting QUantum Interference Device (SQUID) amplifier that is designed for applications requiring high bandwidth and dynamic range. The output signal of a low-noise SQUID in the input stage coherently modulates a series array of identical SQUIDs in the output stage via a common modulation line. The input stage is designed so its output signal does not produce multiple modulation periods in the output stage. The output stage is designed to have sufficient gain so the output noise is dominated by the amplified noise of the input SQUID and exceeds the noise of a preamplifier in the room temperature readout electronics. The SQUID amplifier may therefore be operated without flux modulation or any impedance matching network, resulting in a large dynamic range and high bandwidth.