CN103228104A - Single-out-multiple switching circuit PCB (printed circuit board) of electrical impedance tomography serial data acquisition system - Google Patents
Single-out-multiple switching circuit PCB (printed circuit board) of electrical impedance tomography serial data acquisition system Download PDFInfo
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- CN103228104A CN103228104A CN2013100616358A CN201310061635A CN103228104A CN 103228104 A CN103228104 A CN 103228104A CN 2013100616358 A CN2013100616358 A CN 2013100616358A CN 201310061635 A CN201310061635 A CN 201310061635A CN 103228104 A CN103228104 A CN 103228104A
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Abstract
A single-out-multiple switching circuit PCB (printed circuit board) of an electrical impedance tomography serial data acquisition system relates to a single-out-multiple switching circuit of a serial data acquisition system of an electrical impedance tomography system. The single-out-multiple switching circuit PCB is divided into four PCB sub boards; switching circuits are distributed on the PCB sub boards; each switching circuit composed of a single-out-multiple switching chip is arranged on each PCB sub board; and the circuits on the PCB sub boards are connected through connectors 8. With adoption of the single-out-multiple switching circuit, wiring difficulty is greatly reduced, locating and wiring workload is reduced, and flat area of the PCB is reduced. The single-out-multiple switching circuit has the advantages of simple structure, low cost, low crosstalk, small size, convenience in controlling strict constant phase and facilitation in combination expansion.
Description
Technical field
the present invention relates toand serial data collection system multiselect 1 switching circuit of Electrical Impedance Tomography System (EIT)
.
background technology:electrical Impedance Tomography System (EIT) is a kind of known imaging of medical technology, it is by detecting patient body-surface, thereby this method of image of inferring the conductivity of patient's part health and permittivity is carried out imaging, it is a kind of harmless harmless novel imaging technique.With nuclear medicine technology such as CT, MRI, compare, EIT have harmless harmless, cost is low, volume is little, safe, simple to operate, to advantages such as early carcinoma kitchen range sensitivities, doctor and patient are acceptant.But the imaging precision of EIT is relatively not high, because data acquisition and the image taking speed of EIT are higher, can be used for the patient is carried out to real-time, dynamic monitoring for a long time, there is medical application prospect widely.
The EIT imaging is the inverse problem solution procedure of a Very Ill-conditioned, and reconstitute picture and be broadly divided into three classes: back projection, iterative method, a step linear approach, above algorithm for reconstructing is to all requirements to some extent of convergence.Therefore, no matter take which kind of data acquisition scheme, the picture quality of EIT imaging all depends on collected data precision, and very high to the data required precision.According to the EIT basic functional principle, the EIT system architecture is basically identical.Describe as numerous data about the EIT aspect and patent (as CN03134598.0), all formed by data acquisition system, electrode, excitation system, data processing and imaging system.Electrode, data acquisition system performance directly affect the image data precision, thus image quality.And the serial data collection system comprises switching system, LNA, differential amplification, filtering, AD etc., wherein the isolation of the CMRR of the noiseproof feature of LNA, differential amplification, switching system, on-resistance properties are difficult points.
The EIT data acquisition system is divided in mode, can be divided into parallel acquisition system and serial acquisition system.Suppose to have N electrode, serial acquisition system acquisition signal data divides a plurality of steps: at first 12 electrode differential signals are done to the AD conversion, collect 12 electrode differential signal data, then successively to 23 ... N-1 N electrode differential signal is that AD walks around and data acquisition; And parallel system once just arrives these signals collecting.Parallel system does not need multiselect 1 switch, and tandem system needs switch, and parallel system needs a plurality of acquisition channels and AD, and tandem system only needs multiselect 1 switch and an acquisition channel and 1 AD.The parallel system cost is high, and each acquisition channel exists inconsistent, and the structure that system complex is brought is relative complex also; Tandem system structure is relative with circuit design simple doubly a lot, and cost is low, but need overcome crosstalking and the excessive problem of conducting resistance of multiselect 1 switch existence.
At present, all higher for self isolation of EIT serial data collection system multiselect 1 switch, but in order to save the area of device, the encapsulation of multiselect 1 switch is very little, often the spacing of multiple signals pin is very little, and the wiring difficulty is large, the height of crosstalking between signal after wiring.If design is 16 electrode serial EIT data acquisition systems, need to use 4 16 and select 1 switch, difference gating driving source anode source+, driving source negative terminal source-, collection signal passage anode signal+, collection signal passage negative terminal signal-, these 4 switches are on a pcb board after complete wiring, and between very large, the complicated and line of the area occupied of wiring, spacing can not be drawn opens very much, each holding wire length is inconsistent;
Each channel signal line length is inconsistent, and difference is even larger, and the part digital line also intersects with analog signal line.Fig. 1 is 4 16 and selects the best wire laying mode (to greatest extent reduce line-to-line crosstalk) of 1 switch on same PCB, on same PCB, to 4 16, select 1 switch placement-and-routing mode to also have other several, but all be not so good as Fig. 1 placement-and-routing mode, nonetheless still have the problems such as the PCB area is large, complicated, each channel signal line is not isometric, the analog digital line mixes, existence is crosstalked that take.
Electrical impedance tomography serial data collection system multiselect 1 switching circuit system comprises multiselect 1 switching circuit PCB, digital control interface, multiple signals input interface, signal output interface, power interface.
technical scheme
Electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB, each channel signal line existed for improvement of conventional switch circuit PCB placement-and-routing can't be isometric, the analog digital line mixes, and takies the problems such as the PCB area is large, signal line-to-line crosstalk height.
Electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB, described multiselect 1 switching circuit PCB is divided into four PCB and divides plate, switching circuit is distributed in PCB and divides on plate, every PCB divides on plate the switching circuit that has a multiselect one switch chip to form, and PCB divides plate and PCB to divide the connector for circuit (8) between plate to be connected.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, PCB divides on plate switch numbers control signal through hole, electrode input signal through hole, output signal through hole, power supply through hole, multiselect 1 switch chip; Every PCB divides multiselect 1 switch chip and same PCB on plate to divide the through hole of the switch numbers control signal on plate, electrode input signal through hole, and the output signal through hole, the power supply through hole is connected with multiselect 1 switch chip on same PCB; Different PCB divides switch numbers control signal through hole corresponding on plate, electrode input signal through hole, and the output signal through hole, the power supply through hole connects with connector respectively.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, PCB divides plate and PCB to divide the distance between plate to be not less than 10mm.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, PCB divides the edge of plate and/or the position, space in printed circuit that fixing hole is arranged, four PCB divide the fixing hole on plate mutually corresponding, and fixed leg divides plate fixing four story frame structures that form four PCB through fixing hole.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, PCB divides plate and PCB to divide between plate and is connected with connector is vertical.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, described connector is the copper pin.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, the output signal through hole is 4, the power supply through hole is 3.
onthe electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB stated, described multiselect 1 switching circuit PCB 16 selects 1 switch switching circuit PCB, switch numbers control signal through hole is 20, and electrode input signal through hole is 16, and multiselect 1 switch chip is 16 to select 1 switch chip.
Above-mentioned electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB, described multiselect 1 switching circuit PCB 32 selects 1 switching circuit PCB, described switch numbers control signal through hole is 24, and electrode input signal through hole is 32, and multiselect 1 switch chip is 32 to select 1 switch chip.
Beneficial effect: for the characteristics of EIT serial data collection data system multiselect 1 switching circuit portion, by adopting four PCB to divide plate, every PCB divides plate to put a multiselect 1 switch and replaces a PCB to put this structure of polylith multiselect 1 switch, can greatly reduce the wiring difficulty, reduce placement-and-routing's workload, reduce the PCB area of plane.Every block of minute plate only has multiselect 1 switch, can very conveniently do the circular arc type wiring, and round wiring can make between line spacing very large, and line and line are isometric.Therefore can reduce greatly this problem of signal cross-talk between the electrode wires that switching system wiring in the past introduces, simultaneously can strict control electrode signal equiphase.Due to wiring nearby, so the multiselect 1 switching system structure of this structure can, so that length of arrangement wire reduces, effectively reduce the shunt capacitance amount of line with respect to traditional structure (putting a structure on pcb board).Generally speaking, this multiselect 1 switching circuit PCB, have advantages of simple in structure, phase, the convenient combination expansions such as cost is low, it is low to crosstalk, volume is little, the strict signal of convenient control.
The accompanying drawing explanation
Fig. 1: 1 switching signal circuit layout card is selected on described traditional 4 tunnels 16 of background technology, and wherein, figure a is all layer wiring diagrams; Figure b is top layer analog signal wiring diagram; Figure c is intermediate layer analog signal wiring diagram; Figure d is intermediate layer digital controlled signal wiring diagram; Figure e is bottom analog signal wiring diagram.What source+ and signal+ were corresponding 16 selects 1 switch to be placed on top layer on pcb board, what source-, signal-signal were corresponding 16 selects 1 switch to be placed on the bottom of PCB, select for 4 16 1 switch 16 signal input lines to share, export respectively signal+, signal-, source+, source-signal;
Fig. 2 is minute plate 1 structure and a wiring diagram;
Fig. 3 is minute plate 2 structures and a wiring diagram;
Fig. 4 is minute plate 3 structures and a wiring diagram;
Fig. 5 is minute plate 4 structures and a wiring diagram;
Fig. 6 is that optimization 16 is selected 1 switching system structure and wiring diagram;
Fig. 7 is the connection diagram of multiselect 1 switching system in the EIT system;
1-switch numbers control signal through hole, 2-fixing hole, 3-electrode input signal through hole, 4-output signal through hole, 5-power supply through hole, 6-multiselect, 1 switch chip, 7-fixed leg, 8-connector, 9-nut.
Embodiment:
Embodiment 1: electrical impedance tomography serial data collection system 16 selects 1 switching circuit PCB to form by following parts and structure:
16 select 1 switching circuit PCB to be comprised of the little minute plate of PCB of 4 independent small size Belt connectors, and between them, with connector 8, the mode by welding connects, and hexagonal copper post is fixed; PCB divides plate (hereinafter to be referred as plate or minute plate) and PCB to divide the actual copper of the cylinder one by one pin for disperseing of connector 8 of plate, and the copper pin is of a size of: circular diameter 0.8mm at the bottom of long 6cm, for connecing analog and digital signal; The copper pin of Chang6cmDi garden diameter 1.2mm connects for power supply;
It is 35mm*40mm that every PCB divides the area of plate, 2 laminates.Divide on plate 16 almost electrode input signal through holes 3 of besieged city circle, the bore dia 1mm of electrode input signal through hole 3 are arranged; 5 digital signal via of switch numbers control signal through hole 1 are in a row, totally 4 arrange, and bore dia 1mm, hole and pitch of holes 1.8mm, switch is controlled pin and is connect first row (sequence from the bottom up); Power supply through hole 5, be 3 through holes, bore dia 1.3mm, hole and pitch of holes 1.8mm, connect respectively positive supply, negative supply; 4 outputting analog signal through holes 4 that form a line, bore dia is 1mm, and between the output signal hole, spacing is 1.8mm, and label is OUT; Installing hole 2 has 4 on 4 corners of minute plate, and available fixed leg 7 is installed and is fixed into four story frame structures.
Dividing on plate 1 has one 16 to select 1 switch chip 6, this 16 selects 1 switch chip (abbreviation switch chip) 6 for market universal switch chip, arrive switch chip 6 by 16 analog signals of electrode input signal through hole 3 inputs, the comprehensive control signal from switch numbers control signal through hole 1, switch chip 6 is determined an analog signal be strobed, by the lead-foot-line output be connected with output signal through hole 4; The digital signal of control switch gating has 5 lines (wherein is chip enable control line and 4 gatings control address wires), with switch numbers control signal through hole 1, is connected respectively; This switch by power supply through hole 5 connect positive-negative power (power supply through hole 5 has three holes, comprise positive supply, negative supply, pin bores), can connect positive and negative 5 volts to positive and negative 18 volts of power range; The composition structure of minute plate 2, minute plate 3, minute plate 4 is basically identical with minute plate 1, only has the output signal of 2 difference: A, minute plate 1 to connect the 1st through hole of 4 output signal through holes 4 that form a line; The output signal of minute plate 2 connects the 2nd through hole of 4 output signal through holes 4 that form a line; The output signal of minute plate 3 connects the 3rd through hole of 4 output signal through holes 4 that form a line; The output signal of minute plate 4 connects the 4th through hole of 4 output signal through holes 4 that form a line; The digital controlled signal of B, minute plate 1 runs in into the first row of 20 pin digital controlled signal through holes 1 of 4 row, the digital controlled signal of minute plate 2 runs in into the second row of 20 pin digital controlled signal through holes 1 of 4 row, the digital controlled signal of minute plate 3 runs in into the 3rd row of 20 pin digital controlled signal through holes 1 of 4 row, and the digital controlled signal of minute plate 4 runs in into the 4th row of 20 pin digital controlled signal through holes 1 of 4 row.
Dividing the analog signal of plate 1 gating output is driving source anode source+; The analog signal that the analog signal of dividing plate 2 gatings outputs is driving source negative terminal source-, the 3 gatings outputs of minute plate is collection signal passage anode signal+; Dividing the analog signal of plate 4 gatings outputs is collection signal passage negative terminal signal-.
With the copper pin of 40 0.8mm diameters, 4 planks are connect by these 40 simulations and the vertical series welding of digital signal through hole; With the copper pin of 3 1.2mm diameters, divide the vertical series welding of power supply through hole 5 on plate to connect 4 PCB; Divide the vertical interval 1cm between plate and minute plate, a minute plate has 4 installing holes 2 in 4 weeks, by installing hole 2 use hexagonal copper posts 7, will divide plate and a minute plate to fix; Fixing latter 4 minutes plates have just formed an electrical impedance tomography serial data collection system 16 and have selected 1 switching circuit PCB.
Divide plate 1, minute plate 2, minute plate 3, minute plate 4 to be used for EIT serial data collection system 16 by copper pin composition and select 1 switching circuit PCB.This 16 selects 1 switching system that 16 EIT electrode input signals are arranged; 20 switch numbers control signals; Export 4 OUT signals, connect respectively the Source+(positive energize signal of EIT system constant-current source driver unit output) and Source-(negative energize signal) and Acquisition Circuit partly input analog signal TP+(and gather positive analog signal) and TP-(collection negative analog signal); 3 power pins, be respectively positive supply, negative supply, pin; Its each minute plate respectively has a switch chip 6.
It is simple, simple in structure that this switching system wiring has wiring, takies plane space little, and because spacing between holding wire is large, between holding wire, almost without crosstalking, holding wire is isometric can be accomplished easily, can strictly control each signal equiphase.What adopt the design of this structure and wire laying mode selects 1 switching system for 16 of EIT serial acquisition system, can greatly save the installation work amount, and reduction is crosstalked, and controls equiphase, improve EIT system efficiency with and performance index etc.
Embodiment 2: electrical impedance tomography serial data collection system 16 is selected 1 switching circuit PCB: the basic structure of the present embodiment is with embodiment 1, difference is: at first draw the schematic diagram that PCB divides plate 1, (switch numbers control signal through hole 1 is 20 to the through hole that intended diameter is 1mm, electrode input signal through hole 3 is 16, output signal through hole 4 is 4,) and the through hole (power supply through hole 5 is 3) of 1.3mm, these through holes divide the through hole on plate corresponding with other 3 PCB respectively; On schematic diagram, the digital controlled signal pin is connected with 5 switch numbers control signal through holes 1, the analog signal pin of switch element is connected (electrode input signal pin is connected with electrode input signal through hole 3, and the output signal pin is connected with output signal through hole 4) with the through hole of 1mm; The VDD-to-VSS pin is connected by the PCB cabling with the ventilating hole element of the power supply through hole 5 of 1.3mm diameter.
A minute plate 1 is done to the PCB design, at first draw the plank housing of 35mm*40mm, then by 16, select 1 switch to be positioned over central authorities, will be looped around the pin periphery with the radius circular of 14mm with 16 through holes 3 of 16 analog signal input pins, with the line of 10mil, its door is connected; Do not have the independent through-hole of any connection to be arranged in a row with the 1.8mm spacing by 5, its centre distance plank housing top edge 2mm place, be 17.5mm apart from the plank left and right edges, draws the 4th exhausting hole (row's sequence number by rule definition) from the bottom up; In like manner draw the 3rd row, second row, row is 1.8mm with row's vertical interval, and the first row in switch numbers control signal through hole 1 is controlled pin with switch numbers and is connected; Switch analog output signal pin connects with the 10mm interval vertical and connects 4 first through holes (from top to bottom) in the output signal through hole 4 formed a line by cabling; Power supply through hole 5 is the 2.5mm place below switch, and 3 power supply through holes 5 are in line with the 1.8mm spacing, and the copper cash of walking the 20mil width with the power pins of switch by PCB respectively is connected.
Divide the schematic diagram of plate 2 the same with minute plate 1.
Divide the PCB figure of plate 2 basic identical with minute plate 1, different is controls with switch numbers the second row that 5 switch numbers control signal through holes 1 that pin is connected have been discharged to via-hole array (5 of the every row of 4 row), second through hole that the through hole be connected with the switch outputting analog signal is 4 output signal through holes 4 forming a line.
Divide the schematic diagram of plate 3 the same with minute plate 1.
Divide the PCB figure of plate 3 basic identical with minute plate 1, different is controls with switch numbers 5 switch numbers control signal through holes 1 that pin is connected and has been discharged to via-hole array (5 of the every row of 4 row) the third line, the 3rd through hole that the through hole be connected with the switch outputting analog signal is 4 output signal through holes 4 forming a line.
Divide the schematic diagram of plate 4 the same with minute plate 1.
Divide the PCB figure of plate 4 basic identical with minute plate 1, different is controls with switch numbers the fourth line that 5 switch numbers control signal through holes 1 that pin is connected have been discharged to via-hole array (5 of the every row of 4 row), the 4th through hole that the through hole be connected with the switch outputting analog signal is 4 output signal through holes 4 forming a line.
Respectively the copper pin of the copper pin 8 of 6cm length diameter 0.8mm and 1.2mm 9 strings are inserted to welding, total copper pin number is 43, pass minute about 1cm of plate 1 through hole at the bottom of pin, after all 43 bronze medal pins have welded upward, 43 through holes of minute plate 2 are worn facing to pin from top to bottom, directly over minute plate 1, stop in the 1cm place, and by pin and through hole welding, with 1cm, high copper post is fixed a minute plate 1, minute plate 2, so far, divides plate 1, divides plate 2 welding assemblies complete.
To divide successively plate 2, a minute plate 3 to assemble, hexagonal copper post 7 use nuts 9 will be locked simultaneously, and just form and complete for 16 of EIT serial data collection system, selected 1 switching system.
After this switching system assembling, it is exactly a general frame structure, it be with from through hole copper pin out do pin, the copper pin wherein worn out from power supply through hole 5 is power pins, the copper pin worn out from electrode input signal through hole 3 is the electrode signal input pin, from the logical copper pin worn out of output signal 4, it is the output signal pin
From the logical copper pin worn out of switch numbers control signal through hole 1, it is switch numbers control signal pin.
This system is connected to the Serial E IT system: the source+ of excitation, source-are connected with the gating output signal pin of a minute plate 1, minute plate 2 respectively, and signals collecting is connected with the gating output signal of a minute plate 3, minute plate 4 respectively with signal+, the signal-signal of conditioning system; 20 switch numbers control signal pins of switching system are connected with master control, and the power pins of switching system is connected with the power supply of system; The electrode input signal pin of switching system is connected with electrode wires.
In embodiment 1 or embodiment 2, if do not considered fixing, the supporting role of connector to minute plate, output signal through hole 4 can only have one on minute plate 1, with multiselect 1 switch chip from minute plate 1, is connected; Output signal through hole 4 can only have two on minute plate 2, and one of them passes for the connector that connects minute plate 1 output signal, and another connects multiselect 1 switch chip on minute plate 2; Output signal through hole 4 can only have 3 on minute plate 3, and one of them connects multiselect 1 switch chip on minute plate 3, and another two are passed for the connector that connects minute plate 1 or 2 output signals; Output signal through hole 4 has 4 on minute plate 4, and one of them connects multiselect 1 switch chip on minute plate 4, and another three are passed for the connector that connects minute plate 1,2 or 3 output signals.
The described switching system structure of embodiment 1 or embodiment 2 and wire laying mode not only select 1 switching system for 16, widenable to any multiselect 1 switching system.
The described copper pin of embodiment 1 or embodiment 2, can replace with other metal or alloy conductor, can be other shape cylinder, adopts cylindrical conductor except each minute plate related circuit of conducting, also have support, the effect of fixing minute plate; The connector 7 that connects corresponding through hole between each minute plate can use the conductor of same material, also can use the conductor of different materials, and the size of each connector 7, shape can be identical, also can be different.If select the column connector, and column connector series welding metapedes on the corresponding through hole of each minute plate so that plate fixedly became four story frame structures by each minute, divides on plate and just can there is no fixing hole 2; In the situation that fixing hole 2 and fixed leg 7 are arranged, connector also can be selected other wires.
The size of embodiment 1 or the described connector 7 of embodiment 2, can change with the size of minute plate, but should guarantee the distance between each electrode input signal through hole 3, output signal through hole 4, and generation prevents from crosstalking.
Embodiment 1 or the described hexagonal copper of embodiment 2 post, available other alloy erection column, plastic mounting post replace, and can be also other shape cylinders.
The described fixing hole 2 of embodiment 1 or embodiment 2 can be distributed on four angles that each minute plate is corresponding, also can be distributed on other correspondence positions on minute plate: as the edge of the space between printed circuit, minute plate.
Embodiment 3: electrical impedance tomography serial data collection system 32 is selected 1 switching circuit PCB, the present embodiment basic structure is with embodiment 1, difference is: electrode input signal number of openings is 32, digital switch control signal number of openings is 24, and selected switch chip is 32 to select 1 switch chip.
Embodiment 4: electrical impedance tomography serial data collection system 64 is selected 1 switching circuit PCB, the present embodiment basic structure is with embodiment 1, difference is: electrode input signal number of openings is 64, digital switch control signal number of openings is 28, and selected switch chip is 64 to select 1 switch chip.
The described through hole of above-described embodiment is generally circular hole, but as required, can be also rectangle or other shapes.
The electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB of the described multistory frame structure of above-described embodiment is preferred structure, and these four PCB divide plate also can be combined into other shapes, as tetrahedron, spherical surface body, hexahedron, as long as guarantee the every distance of dividing each circuit and element on plate, connecting the connector of each minute plate, just can realize the purpose of the invention.
Described multiselect one switch chip 6 of above-described embodiment can also can be selected in market ready-made chip according to circuit theory designed, designed, manufacture, as: model is ADG5206 16 selects a switch chip; Model is that 32 of ADG732 selects a switch chip.
Claims (9)
1. electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB, be characterised in that: described multiselect 1 switching circuit PCB is divided into four PCB and divides plate, switching circuit is distributed in PCB and divides on plate, every PCB divides on plate the switching circuit that has a multiselect one switch chip to form, and PCB divides plate and PCB to divide the connector for circuit (8) between plate to be connected.
2. electrical impedance tomography serial data collection system multiselect according to claim 11 switching circuit PCB, be characterised in that: PCB divides on plate switch numbers control signal through hole (1), electrode input signal through hole (3), output signal through hole (4), power supply through hole (5), multiselect 1 switch chip (6); Every PCB divides multiselect 1 switch chip (6) on plate to divide the switch numbers control signal through hole (1) on plate with same PCB, electrode input signal through hole (3), output signal through hole (4), power supply through hole (5) is connected with multiselect 1 switch chip (6) on same PCB; Different PCB divides switch numbers control signal through hole (1) corresponding on plate, electrode input signal through hole (3), and output signal through hole (4), power supply through hole (5) uses respectively connector (8) to connect.
3. according to electrical impedance tomography serial data collection system multiselect claimed in claim 11 switching circuit PCB, be characterised in that: PCB divides plate and PCB to divide the distance between plate to be not less than 10mm.
4. electrical impedance tomography serial data collection system multiselect according to claim 31 switching circuit PCB, be characterised in that: PCB divides the edge of plate and/or the position, space in printed circuit that fixing hole (2) is arranged, four PCB divide the fixing hole (2) on plate mutually corresponding, and fixed leg (7) divides plate fixing four story frame structures that form four PCB through fixing hole (2).
5. electrical impedance tomography serial data collection system multiselect according to claim 41 switching circuit PCB, be characterised in that: PCB divides plate and PCB to divide between plate with vertical connection of connector (8).
6. electrical impedance tomography serial data collection system multiselect according to claim 51 switching circuit PCB, be characterised in that: described connector (8) is the copper pin.
7. according to claim 1,2,3,4,5 or 6 described electrical impedance tomography serial data collection system multiselect 1 switching circuit PCB, be characterised in that: output signal through hole (4) is 4, power supply through hole (5) is 3.
8. electrical impedance tomography serial data collection system multiselect according to claim 71 switching circuit PCB, be characterised in that: described multiselect 1 switching circuit PCB 16 selects 1 switch switching circuit PCB, switch numbers control signal through hole (1) is 20, electrode input signal through hole (3) is 16, and multiselect 1 switch chip (6) is 16 to select 1 switch chip.
9. electrical impedance tomography serial data collection system multiselect according to claim 71 switching circuit PCB, be characterised in that: described multiselect 1 switching circuit PCB 32 selects 1 switching circuit PCB, described switch numbers control signal through hole (1) is 24, electrode input signal through hole (3) is 32, and multiselect 1 switch chip (6) is 32 to select 1 switch chip.
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| CN104207772A (en) * | 2014-09-23 | 2014-12-17 | 思澜科技（成都）有限公司 | Switching board for bio-impedance measurement and electrode switching device |
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| GB2449275A (en) * | 2007-05-15 | 2008-11-19 | Thomas William Bach | Driving a sensor pad for electrical impedance tomography (EIT) |
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| CN103228104B (en) | 2018-01-09 |
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