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Dynamic performance of single-stage SQUID current amplifier with varying device parameters

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4 Author(s)
Kim, Jin-Mok ; Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea ; Yong-Ho Lee ; Hyukchan Kwon ; Yang-Sup Song

We have fabricated a single-stage superconducting quantum interference device (SQUID) current amplifier for detecting pulse outputs of a superconducting microcalorimeter. The current amplifier is made of a double relaxation oscillation SQUID (DROS) that provides a high flux-to-voltage transfer of about 1mV/Φ0 and a large modulation depth of 80 μV. Due to the high flux-to-voltage transfer, the voltage output of the DROS is measured directly with a room-temperature dc preamplifier. The bandwidth of the current amplifier is measured to be 1.2 MHz. Typical noise of the DROS current amplifier is about 6 pA/√Hz.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

June 2003

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