Single frequency noise reduction circuit for squids
Patent 4663590 Issued on May 5, 1987. Estimated Expiration Date: 
November 6, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 6, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3221273 3450899 3725819 Apparatus for reducing low frequency noise in dc biased SQUIDS Radiofrequency amplifier based on a dc superconducting quantum interference device Patent #: 4585999 InventorsAssigneeApplicationNo. 06/784123 filed on 11/06/1985US Classes:324/248, Superconductive magnetometers327/528, Josephson junction505/846Using superconductive quantum interference device (i.e., SQUID): (Class 324/248)ExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Edmonds, Warren S. Attorney, Agent or FirmInternational ClassG01R 33/035 (20060101)AbstractA two-junction DC SQUID is supplied a single square-wave frequency signal that both biases the SQUID and provides modulation with a square-wave train that is 90° phase displaced with respect to the bias square-wave train in order to eliminate low frequency noise with cross-modulation frequency products.Other References
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