A 1-MHz low noise preamplifier based on Double Relaxation Oscillation SQUIDs

Hamster, A.W. and Duuren van, M.J. and Brons, G.C.S. and Flokstra, J. and Rogalla, H. (1999) A 1-MHz low noise preamplifier based on Double Relaxation Oscillation SQUIDs. IEEE Transactions on Applied Superconductivity, 9 (2, Pa). pp. 2915-2918. ISSN 1051-8223

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Abstract:	A low noise and wideband preamplifier based on Double Relaxation Oscillation Superconducting Quantum Interference Devices (DROSs) has been realized. A major advantage of a DROS is that it can be operated in a simple flux modulation. So far, biomagnetic measurements performed in our group required only a limited bandwidth smaller than 100 kHz. Other applications, like for instance readout of radiation and particle detectors, demand a larger bandwidth. In this paper, we will discuss our efforts aimed at increasing the operational bandwidth of a DROS in flux locked loop. Presently, a flux locked loop scheme with a -3 dB bandwidth of 1.45 MHz has been built. With this system a white flux noise of 8 ¿¿0/¿Hz was measured with a 1/f-corner frequency of 10 Hz. The slew rate was 2.5·105 ¿0/s. With the mutual input inductance of 6.7 nH, an input current noise of the preamplifier of 2.5 pA/¿Hz was found and a current slew rate of 80 mA/s. We will discuss the suitability of our DROS-based preamplifier for readout of cryogenic particle detectors based on superconducting tunnel junctions
Item Type:	Article
Copyright:	©1999 IEEE
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/23974
Official URL:	http://dx.doi.org/10.1109/77.783640
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