DC-SQUID electronics based on the noise cancellation scheme
作者： M. Kiviranta , H. Seppa
DOI: 10.1109/77.403007
关键词: Flicker noise 、 Noise spectral density 、 Electrical engineering 、 Y-factor 、 Low-noise amplifier 、 Noise generator 、 Noise temperature 、 Physics 、 Noise figure 、 Effective input noise temperature
摘要: We have constructed a compact dc SQUID electronics unit, in which the noise of room-temperature amplifier is measured by and cancelled out. This makes it unnecessary to use transformer modulation scheme achieve matching between amplifier. The unit contains PI/sup 3/2/-controller has demonstrated bandwidth 100 kHz, 1.2 /spl mu//spl Phi//sub 0///spl radic/(Hz) white level 1/f corner 0.3 Hz flux-locked loop mode. design criteria for noise-cancelled are discussed, including problem excess noise. >
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sci-hub.se 参考文章(5)
Heikki Seppä, Hannu Sipola, A high open‐loop gain controller Review of Scientific Instruments. ,vol. 61, pp. 2449- 2451 ,(1990) , 10.1063/1.1141337
D. Drung, R. Cantor, M. Peters, H. J. Scheer, H. Koch, Low‐noise high‐speed dc superconducting quantum interference device magnetometer with simplified feedback electronics Applied Physics Letters. ,vol. 57, pp. 406- 408 ,(1990) , 10.1063/1.103650
H. Seppa, M. Kiviranta, A. Satrapinski, L. Gronberg, J. Salmi, I. Suni, A coupled DC SQUID with low 1/f noise IEEE Transactions on Applied Superconductivity. ,vol. 3, pp. 1816- 1819 ,(1993) , 10.1109/77.233329
H. Seppa, A. Ahonen, J. Knuutila, J. Simola, V. Volkman, DC-SQUID electronics based on adaptive positive feedback: experiments IEEE Transactions on Magnetics. ,vol. 27, pp. 2488- 2490 ,(1991) , 10.1109/20.133723
H. Seppä, DC-SQUID Electronics Based on Adaptive Noise Cancellation and a High Open-Loop Gain Controller 4th International Conference SQUID ’91. pp. 346- 350 ,(1992) , 10.1007/978-3-642-77457-7_62