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Title: Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part B: Modulated inductance switching

Abstract

We describe a technique for substantially decreasing the noise in SQUID measurement applications which are intrinsically low frequency or dc and thus fall below the 1/f knee in the SQUID noise energy spectrum. Direct switching of the SQUID input leads at a frequency above the 1/f knee, a technique detailed in the preceding article (Anderson et al., Rev. Sci. Instrum. 60, xxx (1989)), extends white-noise floor to much lower frequencies with an accompanying loss of slew rate. For those applications where the loss of slew rate is unacceptable, we present in this article an alternate chopping technique which can preserve the original SQUID slew rate with a loss in the low-frequency signal-to-noise energy ratio of about a factor of four.

Authors:
; ;
Publication Date:
Research Org.:
Physics Department, Stanford University, Stanford, California 94305
OSTI Identifier:
6548232
Resource Type:
Journal Article
Journal Name:
Rev. Sci. Instrum.; (United States)
Additional Journal Information:
Journal Volume: 60:2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SQUID DEVICES; SIGNAL-TO-NOISE RATIO; SWITCHES; FREQUENCY DEPENDENCE; INDUCTION; INHIBITION; LASERS; MODULATION; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUXMETERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; SUPERCONDUCTING DEVICES; 420201* - Engineering- Cryogenic Equipment & Devices

Citation Formats

Anderson, J T, Cabrera, B, and Taber, M A. Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part B: Modulated inductance switching. United States: N. p., 1989. Web. doi:10.1063/1.1140462.
Anderson, J T, Cabrera, B, & Taber, M A. Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part B: Modulated inductance switching. United States. https://doi.org/10.1063/1.1140462
Anderson, J T, Cabrera, B, and Taber, M A. Wed . "Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part B: Modulated inductance switching". United States. https://doi.org/10.1063/1.1140462.
@article{osti_6548232,
title = {Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part B: Modulated inductance switching},
author = {Anderson, J T and Cabrera, B and Taber, M A},
abstractNote = {We describe a technique for substantially decreasing the noise in SQUID measurement applications which are intrinsically low frequency or dc and thus fall below the 1/f knee in the SQUID noise energy spectrum. Direct switching of the SQUID input leads at a frequency above the 1/f knee, a technique detailed in the preceding article (Anderson et al., Rev. Sci. Instrum. 60, xxx (1989)), extends white-noise floor to much lower frequencies with an accompanying loss of slew rate. For those applications where the loss of slew rate is unacceptable, we present in this article an alternate chopping technique which can preserve the original SQUID slew rate with a loss in the low-frequency signal-to-noise energy ratio of about a factor of four.},
doi = {10.1063/1.1140462},
url = {https://www.osti.gov/biblio/6548232}, journal = {Rev. Sci. Instrum.; (United States)},
number = ,
volume = 60:2,
place = {United States},
year = {1989},
month = {2}
}