Title :
Dynamic performance of single-stage SQUID current amplifier with varying device parameters
Author :
Kim, Jin-Mok ; Lee, Yong-Ho ; Kwon, Hyukchan ; Song, Yang-Sup
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea
fDate :
6/1/2003 12:00:00 AM
Abstract :
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.
Keywords :
SQUIDs; amplifiers; nuclear electronics; particle calorimetry; superconducting particle detectors; 1.2 MHz; double relaxation oscillation SQUID; dynamic characteristics; flux-to-voltage transfer coefficient; modulation depth; single-stage SQUID current amplifier; superconducting microcalorimeter; Bandwidth; Circuits; Extraterrestrial measurements; Interference; Pulse amplifiers; SQUIDs; Superconducting device noise; Superconducting devices; Superconducting transition temperature; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.814042
