CN104345286A - Integral circuit and superconductive quantum interference sensor using integral circuit - Google Patents
Integral circuit and superconductive quantum interference sensor using integral circuit Download PDFInfo
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- CN104345286A CN104345286A CN201310340677.5A CN201310340677A CN104345286A CN 104345286 A CN104345286 A CN 104345286A CN 201310340677 A CN201310340677 A CN 201310340677A CN 104345286 A CN104345286 A CN 104345286A
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Abstract
The invention provides an integral circuit and superconductive quantum interference sensor using integral circuit. The superconductive quantum interference sensor has the advantages that a gate which is controlled by an external control signal is arranged in the integral circuit, the integral circuit is changed according to the control signal, and then the integral circuit is subject to one of positive integral, negative integral, resetting and debugging; as the optimum working parameters can be obtained, the working points are flexibly selected, and the reading of the integral circuit of the circuit by the existing superconductive quantum interference sensor is simplified.
Description
Technical field
The present invention relates to a kind of integrating circuit and the superconductive quantum interference sensor that is suitable for.
Background technology
Superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) for the sensitiveest known at present Magnetic Sensor, wherein low-temperature superconducting SQUID sensitivity reaches 10 and flies spy, and high-temperature superconductor SQUID sensitivity reaches 100 and flies spy.These SQUID are important high-end applications sensors, are widely used in biological magnetic, geophysical exploration, in the low-field nuclear magnetic resonance apparatus equipment of pole.
SQUID and sensing circuit together form superconductive quantum interference sensor, and due to the singularity of SQUID work, the linear transformation namely realizing magnetic flux voltage realizes based on sensing circuit principle.
SQUID device not powers on the device namely put into operation.The microelectronic component that superconducting quantum interference device is prepared from by film and micro fabrication by superconductor, be subject to the restriction of materials and process, yield of devices is low, even the consistance between the device of same lots processed is also poor.Therefore the running parameter between device, as bias current and resistance characteristic are completely different.Therefore the sensing circuit coordinated with SQUID device, can not fix parameters such as bias currents, and needs to carry out regulating parameter according to practical operation situation at low ambient temperatures.Therefore debugging test function to be possessed before sensor puts into operation, usually require that sensing circuit can switch to amplifier mode, when the external world loads test magnetic field, SQUID voltage responsive signal can be observed at circuit output end, by this voltage responsive, user just can monitor the situation of SQUID magnetic flux voltage response when regulating bias current, judge whether to be in the highest state of sensitivity (voltage namely responded is maximum).By amplification mode, the adjustment realizing SQUID device bias current can be assisted.
On the other hand, because SQUID field voltage conversion characteristic is nonlinear, present the characteristic of the sinusoidal function in cycle, the working point that therefore sensitivity is maximum may have positive magnetic flux voltage conversion ratio (dV/d Φ) or negative magnetic flux voltage conversion ratio (dV/d Φ).Therefore in order to best sensitivity working point can be chosen, integrating circuit in sensing circuit requires to have positive polarity anomalous integral negative polarity integration selectable punction, circuit be may be locked in and have on the working point of positive magnetic flux voltage conversion slope and negative magnetic flux voltage conversion slope.
In addition, when external disturbance, under the state of Closed loop operation, may there is the spillover because interference occurs, due to the singularity of SQUID, can not automatically reply normal operating conditions after spilling in sensing circuit.In order to allow circuit that working point can be returned, require that circuit has reset function.
In order to meet the demand, current superconductive quantum interference sensor, when for each SQUID cell configuration sensing circuit, also needs to provide debug circuit.This makes the circuit body sum power consumption of current sensor large, cannot tackle the demand that the size of SQUID sensor is more and more less.
Therefore, want the integrated level improving sensor, need to improve existing integrating circuit and sensing circuit.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of integrating circuit and the superconductive quantum interference sensor that is suitable for, for solving the problem of integrating circuit and reading circuit structure complexity in prior art.
For achieving the above object and other relevant objects, the invention provides a kind of integrating circuit for superconductive quantum interference sensor, wherein, described superconductive quantum interference sensor comprises: superconducting quantum interference device, the prime amplifier be connected with the output terminal of described superconducting quantum interference device and the feedback circuit be connected with described integrating circuit, and described integrating circuit at least comprises: the electric signal for being exported by described prime amplifier carries out the integration electronic circuit of Integral Processing; To be connected with integration electronic circuit with described prime amplifier and to carry out the gate of positive polarity integration or negative polarity integration for described integration electronic circuit of ordering in the control of external control signal.
Preferably, described integration electronic circuit comprises: the amplifier be connected with described gate, the electric capacity be connected with the negative input end of described amplifier with the output terminal of described amplifier, and wherein, described electric capacity is also connected with ground wire with the negative input end of described amplifier.
Preferably, described gate comprises: the first gate, and wherein, the input end of described first gate is connected with the output terminal of described prime amplifier, described first gate comprises: the first gating switch, connects the input end of described first gate and the negative input end of described amplifier; Second gating switch, connects the input end of described first gate and the positive input terminal of described amplifier;
Second gate, wherein, the input end of described second gate is connected with the output terminal of described reverser, and described second gate comprises: the 5th gating switch, connects the output terminal of described reverser and the input end of described feedback circuit; 6th gating switch, connects the output terminal of described reverser and the input end of described feedback circuit.
Preferably, described gate also resets for described integration electronic circuit of ordering in the control of external control signal.
Preferably, the first gate in described gate comprises: the 3rd gating switch, one end connects the output terminal of described prime amplifier, and the other end is unsettled.
Preferably, the second gate in described gate comprises: the 7th gating switch, with the Capacitance parallel connection in described integration electronic circuit and one end ground connection.
Preferably, described gate also exports for described integration electronic circuit of ordering in the control of external control signal the electric signal that described prime amplifier exports.
Preferably, the first gate in described gate comprises: the 4th gating switch, connects the input end of described first gate and the negative input end of described amplifier.
Preferably, the second gate in described gate comprises: the 8th gating switch, with the Capacitance parallel connection in described integration electronic circuit and one end ground connection.
Based on above-mentioned purpose, the present invention also provides a kind of superconductive quantum interference sensor, and it at least comprises: superconducting quantum interference device; The sensing circuit be connected with described superconducting quantum interference device, comprising: the prime amplifier be connected with the output terminal of described superconducting quantum interference device; The as above arbitrary described integrating circuit be connected with the output terminal of described prime amplifier; And the feedback circuit to be connected with described integrating circuit.
As mentioned above, integrating circuit of the present invention and the superconductive quantum interference sensor that is suitable for, there is following beneficial effect: by the gating switch of gate, integration electronic circuit can be changed between positive polarity anomalous integral negative polarity integration, simplify the integrating circuit in existing superconductive quantum interference sensor, effectively reduce the size of sensor; Meanwhile, due to the quantity of simplifying power consuming device, integrating circuit of the present invention has lower power consumption.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation comprising the superconductive quantum interference sensor of integrating circuit of the present invention.
Fig. 2 is shown as the structural representation of a kind of optimal way of integrating circuit of the present invention.
Element numbers explanation
1 superconductive quantum interference sensor
11 superconductive quantum interferences pass device
12 prime amplifiers
13 integrating circuit
A1, A0 control interface
SW1-B first gate
S3B first gating switch
S4B second gating switch
S1B the 3rd gating switch
S2B the 4th gating switch
SW1-A second gate
S3A the 5th gating switch
S4A the 6th gating switch
S1A the 7th gating switch
S2A the 8th gating switch
14 feedback circuits
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this instructions can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 2.Notice, structure, ratio, size etc. that this instructions institute accompanying drawings illustrates, content all only in order to coordinate instructions to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.
As shown in Figure 1, the invention provides a kind of superconductive quantum interference sensor.Described sensor 1 comprises: superconducting quantum interference device 11, sensing circuit.
Described superconducting quantum interference device 11(SQUID) for utilizing superconductive quantum interference technology to convert detected magnetic signal to electric signal.
Particularly, described superconducting quantum interference device 11 utilizes superconductive quantum interference technology to detect the faint magnetic signal of certain frequency, after one's own heart magnetic, brain magnetic, nuclear magnetic resonance or geophysics magnetic signals etc., and the equivalent resistance changing self according to detected magnetic signal, to export corresponding electric signal.Described superconducting quantum interference device 11 comprises: superconducting ring and tickler.
Described sensing circuit is used for the electric signal that described superconducting quantum interference device 11 is changed to carry out pre-process, and is exported.Wherein, described sensing circuit comprises: prime amplifier 12, integrating circuit 13 and feedback circuit 14.
Described prime amplifier 12 is connected with the output terminal of described superconducting quantum interference device 11, is amplified for the electric signal described superconducting quantum interference device 11 exported.Wherein, the enlargement factor of described prime amplifier 12 can be tens times to hundred times, preferably, the enlargement factor of described prime amplifier 12 is more than 100 times.
Described integrating circuit 13 carries out Integral Processing for the electric signal exported by described prime amplifier 12.
Particularly, described superconducting quantum interference device 11 is by the impact of magnetic field environment, forward magnetic flux voltage in the flux transfer characteristic of the electric signal exported and the cyclical variation of negative sense magnetic flux voltage, therefore, described integrating circuit 13 needs according to periodically variable flux transfer characteristic locking integration polarity, and the Integral Processing of positive polarity/negative polarity is provided, recycle the feedback function of described feedback circuit 14, to offset the flux change be carried on SQUID.
In order to described magnetic flux voltage locking ring can lock work in the working point of forward and counter magnetic flux voltage, described integrating circuit 13 has the integrating function of positive-negative polarity simultaneously.Described integrating circuit 13 comprises: integration electronic circuit, gate.
Described integration electronic circuit is used for the electric signal that described prime amplifier 12 exports to carry out Integral Processing.Wherein, described integration electronic circuit can comprise controlled forward integration electronic circuit and reverse integral electronic circuit, and the output terminal of described integration electronic circuit is connected with the tickler input end of described feedback circuit 14 with described sensor I1.Preferably, as shown in Figure 2, described integration electronic circuit comprises: the amplifier be connected with described gate, the electric capacity be connected with the negative input end of described amplifier with the output terminal of described amplifier, in addition, described electric capacity is also connected with resistance R3 with the negative input end of described amplifier, resistance R3 is connected with ground wire, also by resistance R2 ground connection while the positive input terminal of described amplifier is connected with described gate, during the gate connected to avoid described amplifier positive input terminal open circuit, there is unsettled and situation generation that is that cannot normally work.
Described gate and described prime amplifier 12 are connected with integration electronic circuit and carry out positive polarity integration or negative polarity integration for described integration electronic circuit of ordering in the control of external control signal.Wherein, described gate conducting resistance when conducting is less than 50 ohm, and the off resistance when disconnecting is greater than megohm, can bear the analog signal transmission of positive and negative 10v simultaneously.Such as, described gate can be relay or single pole multiple throw.
Particularly, described gate has the control interface be connected with external unit, and described external unit transmits control signal to described gate, and described gate integration electronic circuit according to described control signal gating carries out positive polarity integration or negative polarity integration.
Such as, when described gate receives the control signal of negative polarity integration, described gate is by the negative input end UNICOM of the amplifier in the output terminal of described prime amplifier 12 and described integration electronic circuit, the output terminal of described amplifier connects described feedback circuit 14, then described prime amplifier 12, integration electronic circuit and feedback circuit 14 form the sensing circuit based on positive polarity working point.
Preferably, as shown in Figure 2, described gate is that two N selects a gate, wherein, N is the quantity of gating switch in gate, and the described couple of N selects each gate in a gate all by the control of a control interface, simultaneously, according to corresponding control, each gate only has a gating switch to close.Such as, described gate selects a gate for two four.Described gate can also comprise: have the first gate SW1-B of control interface A1, A0 and have the second gate SW1-A of control interface.
Described first gate SW1-B is connected with external unit by respective control interface A1, A0 with the second gate SW1-A, to receive the control signal that described external unit exports.Preferably, described control interface is multiple.Such as, described control interface is 2.Wherein, described control signal can be digital signal, also can be the simulating signal that low and high level is formed.
Described first gate SW1-B also has input end, and the output terminal of described first gate SW1-B is connected with the output terminal of described prime amplifier 12.Described first gate SW1-B at least comprises: the first gating switch S3B and the second gating switch S4B.
Described first gating switch S3B connects the described input end of the first gate SW1-B and the negative input end of described amplifier.
Described second gating switch S4B connects the described input end of the first gate SW1-B and the positive input terminal of described amplifier.
Second gate SW1-A also has input end, and the input end of described second gate SW1-A is connected with the output terminal of described reverser.Described second gate SW1-A at least comprises: the 5th gating switch S3A and the 6th gating switch S4A.
Described 5th gating switch S3A connects the output terminal of described reverser and the input end of described feedback circuit 14.
Described 6th gating switch S4A connects the output terminal of described reverser and the input end of described feedback circuit 14.
As a kind of preferred version, described gate also resets for described integration electronic circuit of ordering in the control of external control signal.
Particularly, when receiving the control signal of reset, the gating switch of the Capacitance parallel connection in described gate conducting and described integration electronic circuit, makes described electric capacity two ends connect, the charge discharge of capacitance stores.
Preferably, described first gate SW1-B also comprises: the 3rd gating switch S1B.Second gate SW1-A also comprises: the 7th gating switch S1A.
Described 3rd gating switch S1B one end connects the output terminal of described prime amplifier 12, and the other end is unsettled.
Capacitance parallel connection in described 7th gating switch S1A and described integration electronic circuit and one end ground connection.
As another preferred version, described gate also exports for described integration electronic circuit of ordering in the control of external control signal the electric signal that described prime amplifier 12 exports.
Particularly, as shown in Figure 2, when receiving the control signal of debugging, described gate makes the capacitor discharge in described integration electronic circuit, and the output terminal of described prime amplifier 12 and resistance R1 one end are connected, the R1 other end is connected with the negative input end of the amplifier in described integration electronic circuit, and the positive input terminal of described amplifier is by resistance R2 ground connection, then described integration electronic circuit becomes sign-changing amplifier, and its enlargement factor is-R4/R1.The electric signal that described prime amplifier 12 exports directly is exported by the amplifier in described integration electronic circuit, so that the flux transfer characteristic of the electric signal that external unit observes described superconducting quantum interference device 11 change, the control signal of locking forwards/reverse working point is exported again to described gate, so that corresponding negative polarity integral feedback circuit 14/ positive polarity integral feedback circuit 14 connected by the gating switch of described gate according to observed flux transfer characteristic.
Preferably, described first gate SW1-B also comprises: the 4th gating switch S2B.Second gate SW1-A also comprises: the 8th gating switch S2A.
Described 4th gating switch S2B connects the described input end of the first gate SW1-B and the negative input end of described amplifier.
Capacitance parallel connection in described 8th gating switch S2A and described integration electronic circuit and one end ground connection.
Described feedback circuit 14 is connected with described integrating circuit 13, the electric signal that the electric signal for exporting based on the output terminal of described integrating circuit 13 regulates described superconducting quantum interference device 11 to export.It comprises: feedback resistance.
According to above-mentioned preferred circuit connecting relation, annexation as shown in Figure 2, the integrating circuit in described magnetic flux lock-in circuit comprises gate, electric capacity and the amplifier that two four select, and the course of work of described integrating circuit is exemplified below:
When control interface A1, A0 of described gate receive that external unit sends by 00 control signal that low and high level is formed time, 3rd gating switch S1B and the 7th gating switch S1A closes, then described prime amplifier is unsettled by the 3rd gating switch S1B, simultaneously, the two ends of described electric capacity C1 are connected by described 7th gating switch S1A, by the electric charge release on electric capacity C1.Because the positive input terminal of the amplifier U1 in integrating circuit is by resistance R2 ground connection, therefore positive input terminal is no-voltage, and negative input end and output are connected by S1A, just defines a follower, after electric capacity C1 charge discharge, the output of amplifier U1 will remain zero.Thus, while described prime amplifier does not export electric signal, described electric capacity C1 is discharged by described 7th gating switch S1A, and the output of integrating circuit amplifier U1 is made zero, and realizes integrator zero and resets.When overflowing appears in sensing circuit, by this operation, described integration electronic circuit realizes reset function.
When control interface A1, A0 of described gate receive that described external unit sends by 01 control signal that low and high level is formed time, described 4th gating switch S2B and the 8th gating switch S2A closes, described prime amplifier 12 is connected with resistance R1, the negative input end of the R1 other end and amplifier U1 is connected, the output terminal of amplifier U1 is connected by the 8th gating switch S2A and resistance R4, and the described resistance R4 other end connects with the negative input end of amplifier U1.The positive input terminal of amplifier U1, by resistance R2 ground connection, therefore keeps no-voltage.Now, resistance R1 and R4 and operational amplifier U1 constitutes an inverse proportion amplifier, enlargement factor-R4/R1.Because amplifier U1 is under inverse proportion amplification mode, the current potential of negative input end is identical with positive input current potential, is all no-voltage, and therefore the negative input end of amplifier U1 is by R3 ground connection, can not have impact to circuit.Therefore at the output terminal of amplifier U1, described external unit can detect the electric signal exported from described prime amplifier 12, realizes the observation of described external unit to SQUID magnetic flux voltage response signal.
When described external unit is determined to make described integrating circuit carry out negative polarity Integral Processing by observation, when described external unit sends by 10 control signal that low and high level is formed to control interface A1, A0 of described gate, described first gating switch S3B and the 5th gating switch S3A closes, then the feedback resistance in the output of the amplifier U1 in described integration electronic circuit and feedback circuit is connected.Simultaneously, electric signal from prime amplifier is connected by the first gating switch S3B and resistance R1, generation current flows into amplifier U1 and electric capacity C1, now, resistance R1 and electric capacity C1 constitutes the integrating circuit of a negative polarity, voltage signal from described prime amplifier drives resistance R1 produce integration current and flow into electric capacity, the voltage that described amplifier U1 exports is the negative polarity integration flowing through resistance R1 electric current, meanwhile, the voltage that described amplifier U1 exports is connected with the feedback resistance in feedback circuit by the 5th gating switch S3A.Thus, prime amplifier, the first gating switch S3B, electric capacity, amplifier, the 5th gating switch S3A and feedback circuit constitute the sensing circuit based on positive polarity working point.Under the feedback of described sensing circuit, the tickler in described superconducting quantum interference device and superconducting ring mutual inductance, so that described feedback current plays the magnetic flux feedback effect to superconducting ring.
When described external unit is determined to make described integrating circuit carry out positive polarity Integral Processing by observation, when described external unit sends by 11 control signal that low and high level is formed to control interface A1, A0 of described gate, second gating switch S4B and the 6th gating switch S4A closes, then the output of amplifier U1 and feedback circuit are connected by described 6th gating switch S4A, prime amplifier 12 exports and connects with the positive input terminal of amplifier U1 by described second gating switch S4B, and now electric capacity C1 forms the integrating circuit of positive polarity in conjunction with resistance R3.The negative terminal of resistance R3 one end concatenation operation amplifier, other end ground connection, under degenerative effect, the voltage be carried on resistance R3 is equal with the voltage being carried in operational amplifier anode from prime amplifier, and what amplifier U1 exported flows through resistance R3 electric current is positive polarity integration.Thus, prime amplifier, the second gating switch S4B, electric capacity, amplifier, the 6th gating switch S4A and feedback circuit constitute the sensing circuit based on negative polarity working point.
In sum, integrating circuit of the present invention and the superconductive quantum interference sensor that is suitable for, by the gating switch of gate, integration electronic circuit can be changed between positive polarity anomalous integral negative polarity integration, simplify the integrating circuit in existing superconductive quantum interference sensor, effectively reduce the size of sensor; Meanwhile, due to the quantity of simplifying power consuming device, integrating circuit of the present invention has lower power consumption.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. for an integrating circuit for superconductive quantum interference sensor, it is characterized in that, at least comprise:
For received electric signal being carried out the integration electronic circuit of Integral Processing;
Be connected with described integration electronic circuit and carry out the gate of positive polarity integration or negative polarity integration for described integration electronic circuit of ordering in the control of external control signal.
2. the integrating circuit for superconductive quantum interference sensor according to claim 1, it is characterized in that, described integration electronic circuit comprises: the amplifier be connected with described gate, the electric capacity be connected with the negative input end of described amplifier with the output terminal of described amplifier, wherein, described electric capacity is also connected with ground wire by resistance with the negative input end of described amplifier.
3. the integrating circuit for superconductive quantum interference sensor according to claim 2, is characterized in that, described gate comprises:
There is the first gate of input end, comprising:
First gating switch, connects the input end of described first gate and the negative input end of described amplifier;
Second gating switch, connects the input end of described first gate and the positive input terminal of described amplifier; Second gate, comprising:
5th gating switch, connects the output terminal of described reverser;
6th gating switch, connects the output terminal of described reverser.
4. the integrating circuit for superconductive quantum interference sensor according to claim 1 or 3, is characterized in that, described gate also resets for described integration electronic circuit of ordering in the control of external control signal.
5. the integrating circuit for superconductive quantum interference sensor according to claim 4, is characterized in that, the first gate in described gate comprises: the 3rd gating switch, and one end connects the input end of described first gate, and the other end is unsettled.
6. the integrating circuit for superconductive quantum interference sensor according to claim 4, is characterized in that, the second gate in described gate comprises: the 7th gating switch, with the Capacitance parallel connection in described integration electronic circuit and one end ground connection.
7. the integrating circuit for superconductive quantum interference sensor according to claim 1, is characterized in that, described gate also exports for described integration electronic circuit of ordering in the control of external control signal the electric signal that described prime amplifier exports.
8. the integrating circuit for superconductive quantum interference sensor according to claim 7, is characterized in that, the first gate in described gate comprises: the 4th gating switch, connects the input end of described first gate and the negative input end of described amplifier.
9. the integrating circuit for superconductive quantum interference sensor according to claim 7, is characterized in that, the second gate in described gate comprises: the 8th gating switch, with the Capacitance parallel connection in described integration electronic circuit and one end ground connection.
10. a superconductive quantum interference sensor, is characterized in that, at least comprises:
Superconducting quantum interference device;
The sensing circuit be connected with described superconducting quantum interference device, comprising:
The prime amplifier be connected with the output terminal of described superconducting quantum interference device;
Be connected with the output terminal of described prime amplifier as the integrating circuit as described in arbitrary in claim 1-9; And
The feedback circuit be connected with described integrating circuit.
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| CN110380700A (en) * | 2019-08-23 | 2019-10-25 | 中国科学院地质与地球物理研究所 | Preamplifier, MEMS sensor reading circuit and MEMS sensor system |
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| CN104345286B (en) | 2017-09-01 |
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Effective date of registration: 20180911 Address after: 201108 221, room 1, 3688 Kim do road, Minhang District, Shanghai. Patentee after: Man Di medical instruments (Shanghai) Co., Ltd. Address before: 200050 No. 865, Changning Road, Shanghai, Changning District Patentee before: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences |