Working point jump control method and system of wide-range SQUID magnetic sensor

Abstract

The invention provides a working point jump control method and system of a wide-range SQUID magnetic sensor. The method comprises, when an output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches an upper-limit voltage amplitude, outputting a control signal to a reset control end of an FLL so that the FLL starts to reset, and, when the output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches a lower-limit voltage amplitude, releasing the control signal so that the FLL naturally enters a locked state. Through two threshold voltage judgment and state control methods, optimal reset control is achieved, accurate switching of working points is ensured, a reset failure is prevented from generating a miscount, reset and relocking processes are also optimized, the shortest time of a switching process is achieved, and the overshoot transient problem generated in traditional reset zero crossing and re-locking processes are prevented.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and relates to a control method of a SQUID magnetic sensor, in particular to a method and system for controlling the jump of a working point of a large-range SQUID magnetic sensor. Background technique [0002] A sensor using a superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) is the most sensitive magnetic sensor known at present. It is widely used in the detection and scientific research of extremely weak magnetic signals such as heart magnetism, brain magnetism, and extremely low-field nuclear magnetic resonance. Due to its use of microelectronic technology, it plays an irreplaceable role in multi-channel, high-resolution, integrated high-end application systems. [0003] SQUID is a superconducting ring composed of two superconducting Josephson junctions connected in parallel, leading out the two ends of the junc...

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Problems solved by technology

[0009] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for controlling the jumping of the working point of a large-range SQUID magnetic sensor, which is used to solve the problem of the jumping of the working point of the existing large-range SQUID magnetic sensor. There are overshoot and oscillation phenomena, and the problem of inaccurate jump counting

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