Modern Physics Letters B · 1989 · 15 citations · 0 references
Natural SciencesElectrical EngineeringPhysicsAnalog ElectronicsCondensed Matter PhysicsMagnetic MaterialsMagnetic Properties Of SolidsNoiseNoise In Electronic DevicesLow-noise Amplifier Noise AnalysisMagnetic FluxMagnetic NoiseNoise CalibrationNoise In AmplifiersSquid MagnetometersWhite NoiseWhite Noise Testing
An investigation of the performance of two hole Y–Ba–Cu–O rf-SQUID operating at liquid nitrogen temperatures are reported. The magnetic flux white noise level ~ 10 −4 Φ 0 (Φ 0 = 2.07 × 10 −15 Wb ) is determined by amplifier noise since it is equal to the white noise level of a low-temperature SQUID with the same amplifier. Overall 1/f fluctuations develop at frequencies below 20 Hz. The measurement methods and the values of the main parameters are given.