DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers
Patent 5254950 Issued on October 19, 1993. Estimated Expiration Date: 
September 13, 2011. 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.
September 13, 2011. 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 ReferencesRadiofrequency amplifier based on a dc superconducting quantum interference device Amplification by a phase locked array of Josephson junctions Josephson junction Q-spoiler Patent #: 4733182 InventorsAssigneeApplicationNo. 759997 filed on 09/13/1991US Classes:324/322Electronic circuit elementsExaminersPrimary: Arana, LouisAttorney, Agent or FirmForeign Patent References
International ClassG01V 003/00AbstractA spectrometer for measuring the nuclear quadrupole resonance spectra or the zero-field nuclear magnetic resonance spectra generated by a sample is disclosed. The spectrometer uses an amplifier having a dc SQUID operating in a flux-locked loop for generating an amplified output as a function of the intensity of the signal generated by the sample. The flux-locked loop circuit includes an integrator. The amplifier also includes means for preventing the integrator from being driven into saturation. As a result, the time for the flux-locked loop to recover from the excitation pulses generated by the spectrometer is reduced. | |
