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

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 ab...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2003-06, Vol.13 (2), p.783-786
Main Authors: KIM, Jin-Mok, LEE, Yong-Ho, KWON, Hyukchan, SONG, Yang-Sup
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Bandwidth
Circuit properties
Circuits
Connection and protection apparatus
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Extraterrestrial measurements
Interference
Oscillators, resonators, synthetizers
Pulse amplifiers
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting device noise
Superconducting devices
Superconducting transition temperature
Voltage
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Summary: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//spl Phi//sub 0/ and a large modulation depth of 80 /spl mu/V. 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//spl radic/Hz.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2003.814042