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Readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and method for inhibiting low-frequency noises

A bias voltage and circuit technology, applied in the direction of the magnitude/direction of the magnetic field, using superconducting devices to measure the magnetic field, etc., can solve the problems that cannot be effectively eliminated

Active Publication Date: 2014-03-26
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

For the SBC configuration SQUID working in the voltage bias mode, the noise self-compensation technology realizes a similar function to the magnetic flux modulation, but in the DC bias mode, the SQUID low frequency intrinsic The noise cannot be effectively eliminated, and it is urgent to develop a method based on the SBC configuration SQUID to effectively suppress the low-frequency intrinsic noise of the SQUID

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  • Readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and method for inhibiting low-frequency noises
  • Readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and method for inhibiting low-frequency noises
  • Readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and method for inhibiting low-frequency noises

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, further elaborate substantive characteristic and remarkable progress of the present invention.

[0018] DC voltage bias: The magnetic flux-current curve of the SBC configuration SQUID is attached figure 1 Figure (a) shows. In the DC voltage bias mode, the external magnetic flux signal is converted into a current signal for reading, and the flux-current curve can intuitively describe the magnetic flux conversion characteristics of the SQUID. The magnetic flux-current curve of the SBC configuration is affected by the inductive coupling of the configuration. It is no longer a symmetrical sinusoidal waveform, and the difference between the steep side and the slow side appears. When the operating point is locked on the steep side, the At the same time, the parallel inductance increases the dynamic resistance of the SBC configuration. The above two effects work together to suppress the input voltage noise of the preamplifier. ...

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Abstract

The invention relates to a readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and a method for inhibiting low-frequency noise. The readout circuit is characterized in that the offset reversal is realized by an offset reversal circuit in order to inhibit the generation of the low-frequency noises; and particularly, the readout circuit comprises an SBC(SQUID Boottrap Circuit)-structured SQUID low temperature part and an offset reversal readout circuit part. The main process of the method comprises the steps of: (1) regulating an input offset voltage in an amplifier; (2) loading an alternating-current square-wave offset voltage; (3) regulating a flux phase and compensating direct-current flux; (4) eliminating carrier waves; and (5) outputting in an integral feedback manner. The circuit related by the invention is simpler in structure and convenient for multi-channel integration, and can be widely applied to low-frequency measurements such as biomagnetism and geophysical exploration, etc.

Description

technical field [0001] The invention relates to a readout circuit based on SQUID bias voltage reversal and a low-frequency noise suppression method. The low-frequency noise suppression is realized based on the readout circuit with bias voltage reversal. Background technique [0002] Superconducting quantum interference device (SQUID) is a highly sensitive magnetic sensitive device, which can be used to construct superconducting magnetic sensors and be used in the fields of biomagnetism, low-field magnetic resonance and geophysical exploration to achieve high-precision magnetic measurement. According to different working principles, superconducting quantum interference devices can be divided into two types: DC SQUID and RF SQUID. Factors such as bias current fluctuations and flux traps cause significant low-frequency intrinsic noise of SQUID, and circuits such as preamplifiers The low-frequency noise of the SQUID-based magnetic sensor (especially the high-temperature supercon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/035
Inventor 荣亮亮张国峰董慧王永良王会武谢晓明江绵恒
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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