Readout circuit and applicable double-stage superconducting quantum interference sensor
A superconducting quantum interference and readout circuit technology, applied in the field of double-stage superconducting quantum interference sensors, can solve problems such as the inability to flexibly adjust the SQUID operating point
Active Publication Date: 2017-11-21
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology
[0010] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a readout circuit and an applicable two-stage superconducting quantum interference sensor, which is used to solve the problem that the readout circuit in the prior art cannot flexibly adjust the work of each SQUID. point of question
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[0040] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0041] see Figure 3 to Figure 5 . It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered.
[0042] ...
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The invention provides a readout circuit and an applicable double-stage superconducting quantum interference sensor. The sensor includes: a double-stage superconducting quantum interference component; a readout circuit connected to the double-stage superconducting quantum interference component; a controlled integral feedback subcircuit connected to the readout circuit and connected to the first A first feedback coil of mutual inductance of the first-level superconducting quantum interference device; a second feedback coil connected with the controlled amplification component in the readout circuit and mutually inductive with the second-level superconducting quantum interference device. Wherein, the readout circuit includes: a preamplifier component connected to the double-stage superconducting quantum interference component; Two-level SQUID or zero-returning controlled amplification component; connected to the output of the pre-amplification component and the controlled amplification component, and feedback the output signal to the first-level SQUID or normalization component in the component in a controlled manner Zero's controlled integral feedback subcircuit.
Description
technical field [0001] The invention relates to a double-stage superconducting quantum interference sensor, in particular to a readout circuit and an applicable double-stage superconducting quantum interference sensor. Background technique [0002] Superconducting Quantum Interference Device (hereinafter referred to as SQUID) is the most sensitive magnetic sensor known at present, and has important applications in the detection of weak magnetic signals, such as heart magnetism, brain magnetism, nuclear magnetic resonance, and geophysical detection. [0003] Since the signal of SQUID is very weak, the maximum output voltage of the response magnetic field is only tens of uV, while working in the superconducting environment of liquid helium (4.2K) or liquid nitrogen (77K), it needs to pass through a long (more than 1 meter) Cables are needed to connect the signal to the amplifier at room temperature, and the long transmission distance will easily lead to signal attenuation. Th...
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IPC IPC(8): G01R33/035
Inventor 王永良徐小峰曾佳孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI