H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 39/22 (2006.01) G01R 33/035 (2006.01)
Patent
CA 2304839
A modulation current at a predetermined frequency f is applied from an AC source to a flux locked loop for maintaining magnetic flux supplied to a SQUID at a constant value. An output voltage is picked out from the SQUID in this state to which a predetermined bias current is being applied from a current and field bias application circuit, and the picked out voltage passed through a filter and a rectifier is monitored by a voltage monitor. The filter picks out a frequency component of 80 kHz which is twice as high as the frequency component f, 40 kHz, applied from the AC source, and maximizes it. In this way, a method and a device for easily adjusting magnetic field bias in a modulation drive circuit for a SQUID can be provided.
Hirano Tetsuya
Itozaki Hideo
Nagaishi Tatsuoki
Bereskin & Parr
Sumitomo Electric Industries Ltd.
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