Varactor tuned ultrahigh frequency SQUID magnetometer

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1136026· OSTI ID:5738332

Long, A P; Clark, T D; Prance, R J

We describe a 430-MHz SQUID magnetometer in which both the resonant frequency of the SQUID tank circuit and the input/output impedances of the following 4.2 K GaAs FET amplifier are varactor controlled. The intrinsic energy sensitivity of the magnetometer, in full flux lock from dc to 5 MHz, is 6.8 x 10/sup -32/ J/Hz (equivalent4 x 10/sup -6/Phi/sub 0//..sqrt..Hz flux sensitivity). The figure of merit is 2.1 x 10/sup -31/ J/Hz.

• Research Organization: School of Mathematical and Physical Sciences, University of Sussex, Brighton, England
• OSTI ID: 5738332
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 51:1; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DATA
ELECTRIC IMPEDANCE
ELECTRONIC EQUIPMENT
FIELD EFFECT TRANSISTORS
FLUXMETERS
IMPEDANCE
INFORMATION
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
RESONANCE
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SENSITIVITY
SQUID DEVICES
SUPERCONDUCTING DEVICES
TRANSISTORS
TUNING
VARIABLE CAPACITANCE DIODES