CN102868405B - A kind of parallel analog-digital signal conversion device - Google Patents
A kind of parallel analog-digital signal conversion device Download PDFInfo
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- CN102868405B CN102868405B CN201210336525.3A CN201210336525A CN102868405B CN 102868405 B CN102868405 B CN 102868405B CN 201210336525 A CN201210336525 A CN 201210336525A CN 102868405 B CN102868405 B CN 102868405B
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Abstract
A kind of parallel analog-digital signal conversion device, comprises power and position voltage generating module, cascade voltage subtracter, power and position voltage comparator, input and N number of digital output end; Each part mentioned above and the line between them are all arranged on same pcb board.Power and position voltage generating module generates power and position voltage; The analog voltage of cascade voltage subtracter to input carries out voltage subtraction computing; Power and position voltage comparator generates the digital comparison signal exported.Adopt parallel analog-digital signal conversion device of the present invention, each components and parts and between line be arranged on pcb board, can unrestricted choice layout type, line live width and cabling mode, transform precision can be realized by the progression increasing subtracter and comparator, coordinate to select to export and drive strong comparator chip, reaching high-precision while, high speed can be realized.
Description
Technical field
The present invention relates to a kind of parallel analog-digital signal conversion device.
Background technology
Along with developing rapidly of Digital Electronic Technique, the application of various digital device, particularly digital computer is increasingly extensive, among all spectra almost penetrating into national economy.Digital computer is merely able to process digital signal, the result of process or digital quantity, it is when automatically controlling for the production of process, variable to be dealt with is continually varying physical quantity often, if temperature, pressure, speed etc. are all analog quantitys, the analog quantity of these non-electronic signals first will become voltage or current signal through transducer, and then converts digital quantity to, can be sent to computer and process.
The process that analog quantity converts digital quantity to is called as analog-to-digital conversion, is called for short A/D (Analog to Digital) conversion; Complete analog-to-digital circuit and be called as A/D transducer, be called for short ADC (Analog to Digital Converter).Analog signal is converted to the signal of telecommunication by transducer, being converted to digital quantity, being processed by digital circuit through amplifying feeding AD transducer.In order to ensure the accuracy of data processed result, AD converter must have enough conversion accuracies.Meanwhile, in order to the needs of the control and detection that adapt to Fast Process, AD converter also must have enough fast conversion speed.Therefore, conversion accuracy and conversion speed are weigh the outstanding feature of AD converter and D/A converter performance quality.
Existing high speed or high precision analogue conversion are all adopt special modulus conversion chip, not only expensive, procurement cycle is long, and due to integrated chip manufacture limitation, make these modulus conversion chips be difficult to meet the requirement simultaneously possessing high accuracy and high speed simultaneously, the modulus conversion chip that output accuracy is high, driving force and arithmetic speed are all very slow.And arithmetic speed is high, the modulus conversion chip that driving force is strong, precision is then not high.The area that chip is limited and inner trace width limit speed and the precision property of modulus conversion chip.
Summary of the invention
Can not meet for overcoming modulus conversion chip the defect simultaneously possessing high accuracy and high speed requirement, the invention provides a kind of analog-digital commutator in parallel:
Technical scheme of the present invention is as follows: a kind of parallel analog-digital signal conversion device, comprises power and position voltage generating module, cascade voltage subtracter, power and position voltage comparator, input and N number of digital output end G
1~ G
n; Each part mentioned above and the line between them are all arranged on same PCB;
Power and position voltage generating module: generate power and position voltage, comprises the reference voltage generation module producing reference voltage and resistor network reference voltage dividing potential drop being produced power and position voltage, also comprises N number of power and position voltage output end A
1~ A
n; Resistor network by reference voltage dividing potential drop, reference voltage and power and position voltage output end A
1connect, each dividing point V
1~ V
n-1with power and position voltage output end A
2~ A
nconnect;
Cascade voltage subtracter: voltage subtraction computing cascaded operational is carried out to the analog voltage of input, exports N-1 analog voltage O
1~ O
n-1, O
1for input voltage deducts reference voltage, from O
2start
When
:
When
:
Wherein VO
mbe M analog voltage O
mmagnitude of voltage, VP
mfor power and position voltage generating module output terminals A
mpower and position magnitude of voltage,
Power and position voltage comparator: the digital comparison signal D generating N number of output
1~ D
n, respectively with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect;
Wherein N be greater than 1 integer, M is the integer being greater than 1 but being not more than N;
Described power and position voltage comparator comprises N number of comparator, and each comparator comprises with to compare input, anti-phasely compares input and comparison signal output, each with comparing input E
1~ E
nwith the power and position voltage output end A of power and position voltage generating module
1~ A
nconnect, anti-phasely compare input F
1be connected with the input of parallel analog-digital signal conversion device, F
2~ F
nwith the analog voltage output O of cascade voltage subtracter
1~ O
n-1connect, comparison signal output D
1~ D
nalso with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect.
Concrete, described cascade voltage subtracter comprises the subtracter of N-1 cascade, and each subtracter comprises operating state selection circuit and subtraction circuit, analog voltage input, power and position voltage input end, comparison signal input, analog voltage output; Operating state selection circuit has control end, input and output, control end is connected with comparison signal input, the input of operating state selection circuit is connected with power and position voltage input end, output is connected with the first input end of subtraction circuit, subtraction circuit comprises first input end, the second input and output, second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with analog voltage output, and subtraction circuit outputs to output after the voltage of two inputs is carried out simulation additive operation; The analog voltage input I of first order voltage subtraction device
1be connected with the input of parallel analog-digital signal conversion device, the analog voltage input of all the other voltage subtraction devices at different levels is connected with the analog voltage output of upper level voltage subtraction device; Power and position voltage input end B at different levels
1~ B
n-1respectively with the power and position voltage output end A of power and position voltage generating module
1~ A
n-1corresponding connection, comparison signal input C at different levels
1~ C
n-1respectively with the comparison signal output D of power and position voltage comparator
1~ D
n-1corresponding connection.
Concrete, described power and position voltage comparator comprises N number of comparator, and each comparator comprises with comparing input E
1~ E
n, anti-phasely compare input F
1~ F
nwith comparison signal output D
1~ D
n, respectively anti-phasely compare input E
1~ E
nwith the power and position voltage output end A of power and position voltage generating module
1~ A
nconnect, with comparing input F
1be connected with the input of parallel analog-digital signal conversion device, F
2~ F
nwith the analog voltage output O of cascade voltage subtracter
1~ O
n-1connect, comparison signal output D
1~ D
nalso with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect.
Concrete, described resistor network is R-2R cascade structure, comprises the electric resistance structure R of (N-1) level series connection
1~ R
n-1, electric resistance structure R
1~ R
n-1include the first resistance and second resistance of series connection, the resistance of the first resistance and the second resistance is than being 1:2, and the free end of this first resistance is connected with the tie point of the first and second resistance of upper level electric resistance structure, the free ending grounding of the second resistance; The free end of the first resistance of first order electric resistance structure is connected with the reference voltage output end of reference voltage generation module, each electric resistance structure R
1~ R
n-1the tie point of the first and second resistance be described dividing point V
1~ V
n-1, respectively with described power and position voltage output end A
2~ A
nconnect.Each power and position voltage utilizing above-mentioned resistor network structure to obtain be reduce successively 50% geometric ratio voltage, the reference voltage output end of reference voltage generation module is also connected to power and position voltage output end A
1.
Preferably, described power and position voltage generating module also comprises N number of voltage follower, the dividing point V of the input of N number of voltage follower and reference voltage and resistor network
1~ V
n-1connect, N number of voltage follower output and power and position voltage output end A
1~ A
nconnect.Each power and position voltage driving capability that resistor network dividing potential drop produces is different, and each power and position voltage is connected by circuit, easily influences each other.Adopt voltage follower to increase power and position voltage driving capability on the one hand, shield influencing each other between each power and position voltage on the one hand.
Concrete, described subtraction circuit comprises operational amplifier four resistance identical with resistance, and resistance and operational amplifier are connected into the form of feedback, makes two of operational amplifier input terminal voltages equal, realize voltage subtraction computing by feedback.
Concrete, described operating state selection circuit is NMOS tube, and the grid of NMOS is connected with comparison signal input, and source electrode is connected with power and position voltage input end with substrate, and drain electrode is connected with the first input end of subtraction circuit.When comparison signal input terminal voltage is high, carry out subtraction, when comparison signal input terminal voltage is low, carry out voltage follow.
Concrete, reference voltage generating circuit is accurate voltage source chip TL431.
Concrete, operational amplifier is chip LM2902.
Preferably, described output G
1~ G
nall be connected with a DC positive power by resistance.Improve the pull-up ability of output.
Preferably, described pcb board is multilayer wiring and two-sided layout to use, and the modules of described parallel analog-digital signal reforming unit is arranged in two different use faces of pcb board: first uses on face and the second use face, can the volume of reduction means.
Further, the power and position voltage comparator of described parallel analog-digital signal reforming unit is arranged on the first use face of pcb board, and power and position voltage generating module and cascade voltage subtracter are arranged on the second use face of pcb board.Be conducive to improving precision and speed.
Adopt analog-digital commutator in parallel of the present invention, each components and parts and between line be arranged on pcb board, can unrestricted choice layout type, line live width and cabling mode, transform precision can be realized by the simple progression increasing subtracter and comparator, coordinate to select to export and drive strong comparator chip, reaching high-precision while, high speed can be realized.
Power and position voltage generating module of the present invention is made up of chip and resistor network, is easy to the detection range expanding input analog signal; Can be selected voltage and the driving force of different work by selection and comparison device and operational amplifier chip, therefore digital-to-analogue reforming unit in parallel of the present invention can work under the supply voltage of relative broad range, and is easy to provide stronger output driving force.
Accompanying drawing explanation
Fig. 1 illustrates each module of analog-digital commutator in parallel of the present invention and connected mode schematic diagram;
Fig. 2 illustrates the schematic diagram of a kind of embodiment of cascade voltage subtracter of the present invention;
Fig. 3 illustrates the schematic diagram of a kind of embodiment of power and position voltage generating module of the present invention;
Fig. 4 illustrates that typical case of the present invention uses schematic diagram;
Fig. 5 illustrates the implementation of a kind of voltage follower in the present invention;
In each figure, Reference numeral name is called: 1. input 2. power and position voltage generating module 3. cascade voltage subtracter 4. power and position voltage comparator 21. operating state selection circuit control end 22. operating state selection circuit input 23. operating state selection circuit output 24. subtraction circuit first input end 25. subtraction circuit second input 26. subtraction circuit output 31. first resistance 32. second resistance 33. is connected in series a little 34. first resistance free end 35. second resistance free end 41. operational amplifier 42. the 3rd resistance 43. the 4th resistance 44. the 5th resistance 45. the 6th resistance;
Power and position voltage output end A
1~ A
n
Power and position voltage input end B
1~ B
n-1
Comparison signal input C
1~ C
n-1
Comparison signal output D
1~ D
n
With comparing input E
1~ E
n,
Anti-phasely compare input F
1~ F
n
Digital output end G
1~ G
n
Analog voltage input I
1~ I
n-1
Analog voltage output O
1~ O
n-1
Electric resistance structure R
1~ R
n-1
Dividing point V
1~ V
n-1
Reference voltage V REF
Ground GND
Input analog voltage value XIN
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The invention provides a kind of digiverter in parallel, comprise power and position voltage generating module 2, cascade voltage subtracter 3, power and position voltage comparator 4, input 1 and N number of digital output end G
1~ G
n; Each part mentioned above and the line between them are all arranged in same PCB(Printed circuit board printed circuit board) on;
Power and position voltage generating module 2: generate power and position voltage, comprises the reference voltage generation module producing reference voltage and resistor network reference voltage dividing potential drop being produced power and position voltage, also comprises N number of power and position voltage output end A
1~ A
n; Resistor network by reference voltage dividing potential drop, reference voltage and power and position voltage output end A
1connect, each dividing point V
1~ V
n-1with power and position voltage output end A
2~ A
n-connect;
Cascade voltage subtracter (3): voltage subtraction computing cascaded operational is carried out to the analog voltage of input, exports N-1 analog voltage O
1~ O
n-1, O
1for input voltage deducts reference voltage, from O
2start
When
:
When
:
Wherein VO
mbe M analog voltage O
mmagnitude of voltage, VP
mfor power and position voltage generating module output terminals A
mpower and position magnitude of voltage,
Power and position voltage comparator (4): the digital comparison signal D generating N number of output
1~ D
n, respectively with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect;
Wherein N be greater than 1 integer, M is the integer being greater than 1 but being not more than N.
Concrete, described cascade voltage subtracter (3) comprises the subtracter of N-1 cascade, and each subtracter comprises operating state selection circuit and subtraction circuit, analog voltage input I
1~ I
n-1, power and position voltage input end B
1~ B
n-1, comparison signal input C
1~ C
n-1, analog voltage output O
1~ O
n-1, operating state selection circuit has control end 21, input 22 and output 23, control end 21 is connected with comparison signal input, the input 22 of operating state selection circuit is connected with power and position voltage input end, output 23 is connected with the first input end 24 of subtraction circuit, subtraction circuit comprises first input end 24, second input 25 and output 26, second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with analog voltage output, subtraction circuit is by two inputs 24, output is outputted to after the voltage of 25 carries out simulation additive operation, the analog voltage input I of first order voltage subtraction device
1be connected with the input 1 of parallel analog-digital signal conversion device, the analog voltage input of all the other voltage subtraction devices at different levels is connected with the analog voltage output of upper level voltage subtraction device, power and position voltage input end B at different levels
1-B
n-1a is exported respectively with the power and position voltage of power and position voltage generating module
1~ A
n-1end is corresponding to be connected, comparison signal input C at different levels
1~ C
n-1respectively with the comparison signal output D of power and position voltage comparator
1~ D
n-1corresponding connection.
Concrete, described power and position voltage comparator comprises N number of comparator, and each comparator comprises with comparing input E
1~ E
n, anti-phasely compare input F
1~ F
nwith comparison signal output D
1~ D
n, each with comparing input E
1~ E
nwith the power and position voltage output end A of power and position voltage generating module
1~ A
nconnect, anti-phasely compare input F
1be connected with the input of parallel analog-digital signal conversion device, F
2~ F
nwith the analog voltage output O of cascade voltage subtracter
1~ O
n-1connect, comparison signal output D
1~ D
nalso with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect.
As shown in Figure 1, be power and position cascade voltage subtracter, comprise the subtracter of multiple cascade, be power and position voltage comparator, comprise multiple comparator in the dotted line frame of the right in figure in left side dotted line frame, each subtracter and comparator are corresponding to be as mentioned before connected.
Analog-digital commutator in parallel of the present invention is used for analog-to-digital conversion, there is an input end of analog signal and multiple digital signal output end, the long number analog voltage XIN that inputs being converted into output exports, the digital signal that each output exports only includes 0 and 1 two states, each output characterizes a power and position voltage, finally can be calculated the analog voltage XO of output signal sign by the digital signal exported:
------①
Wherein GO
ncharacterize the digital signal output valve of each output, VP
ncharacterize the power and position magnitude of voltage that each output is corresponding, each power and position voltage is defined by the power and position voltage generating module in described analog-digital commutator in parallel, N is positive integer, the precision of analog voltage and the difference of input value XIN and XO are determined by N, N is larger, and difference is less, and precision is higher, power and position voltage is the analog voltage that a series of value is different, and the relation between them is determined by the resistor network of power and position voltage generating module.
A kind of implementation that power and position voltage generating module is concrete, as shown in Figure 3, the resistor network of described power and position voltage generating module 2 is R-2R cascade structure, comprises the electric resistance structure R of N-1 level series connection
1~ R
n-1electric resistance structure R
1~ R
n-1include the first resistance 31 and the second resistance 32 of series connection, the resistance of the first resistance 31 and the second resistance 32 is than being 1:2,31 and 32 be connected in series a little for being connected in series a little 33, another free end of 31 and 32 is respectively the first resistance free end 34 and the second resistance free end 35, wherein 35 ground connection, 34 ends of every grade of electric resistance structure are connected with 33 ends of upper level electric resistance structure, and 34 ends of first order electric resistance structure are connected with the reference voltage output end of reference voltage generation module, each electric resistance structure R
1~ R
n-1a little 33 ends that are connected in series be described dividing point V
1~ V
n-1, respectively with described power and position voltage output end A
2~ A
nconnect, the reference voltage output end of reference voltage generation module is also connected to power and position voltage output end A
1.Above-mentioned resistance is little to realizing function effect of the present invention, considers, can select the Chip-R of 20K from cost and convenient welding and the compromise of power consumption aspect.
When the reference voltage that the reference voltage generation module of power and position voltage generating module produces is VREF, those of ordinary skill in the art, need not creative work according to Fig. 3 and mentioned above, easily calculates N number of power and position voltage output end A
1-A
nvoltage be followed successively by VREF, VREF/2, VREF/4 ... VREF/2
n-1.
Preferably, the reference voltage generation module of described power and position voltage generating module selects chip TL431.The TL431 that TIX produces is the three end adjustable shunt reference sources having good thermal stability.Its output voltage two resistance just can be set to any value from 2.5V to 36V in scope arbitrarily.
Preferably, described power and position voltage generating module 2 also comprises N number of voltage follower, the input of N number of voltage follower respectively with the dividing point V of reference voltage and resistor network
1~ V
n-1connect, N number of voltage follower output respectively with power and position voltage output end A
1~ A
nconnect.The principle that realizes of voltage follower is exactly the operational amplifier that a negative feedback connects, various negative feedback mode can be adopted, the present invention illustrates a kind of implementation of resistor network feedback as shown in Figure 5, output is connected with the inverting input of operational amplifier by resistance, and input is connected to the positive output end of operational amplifier.Each power and position voltage driving capability produced due to resistor network dividing potential drop is different, and each power and position voltage is connected by circuit, easily influences each other.Adopt voltage follower to increase power and position voltage driving capability on the one hand, shield influencing each other between each power and position voltage on the one hand.
Described cascade voltage subtracter 3 comprises multiple subtracter, the input value XIN of input 1 and reference voltage V REF is subtracted each other rear output by first order subtracter, from the second level, the output voltage of upper level subtracter subtracts each other with corresponding power and position magnitude of voltage by every grade of subtracter, and such as K level subtracter is by the output voltage of K-1 level subtracter and power and position voltage output end A
kthe voltage of end subtracts each other rear output.
Described subtracter comprises two kinds of mode of operations: subtraction mode of operation and follow mode of operation, and described subtraction mode of operation is: subtracted each other by the voltage of analog voltage input and power and position voltage input end, and the value obtained exports at analog voltage output; Described operating state of following is: directly the voltage of analog voltage input is outputted to analog voltage output; Subtraction mode of operation is when analog voltage input voltage is greater than the mode of operation of the voltage of power and position voltage input end; When the input voltage of analog voltage input is less than the power and position magnitude of voltage of input, because subtracter output valve can not be negative, the output voltage values obtained is not equal to the two difference, at this moment subtracter enters and follows mode of operation, described operating state selection circuit is closed, subtracter is follower, directly the input voltage of analog voltage input is outputted to subtractor outputs and exports.
Concrete a kind of implementation, as shown in Figure 2, described subtraction circuit comprises operational amplifier 41, the 3rd resistance 42 that resistance is identical, the 4th resistance 43, the 5th resistance 44, the 6th resistance 45, operational amplifier comprises in-phase input end, inverting input and output, 3rd resistance 42 is connected with the 4th resistance 43, series connection point is connected with inverting input, the free end of the 3rd resistance 42 is connected with the first input end 24 of subtraction circuit, and the free end of the 4th resistance 43 is connected with the output of operational amplifier; 5th resistance 44 is connected with the 6th resistance 45, and series connection point is connected with in-phase input end, and the free end of the 5th resistance 44 is connected with the second input 25 of subtraction circuit, the free ending grounding of the 6th resistance 45.3rd resistance 42, the 4th resistance 43 form feedback network, and under making operational amplifier stable state, two input operating voltages are equal.Operational amplifier can be selected with low cost, the LM2902 that gain is higher.
Preferably, described operating state selection circuit is NMOS tube, and the grid of NMOS is connected with comparison signal input, and source electrode is connected with power and position voltage input end with substrate, and drain electrode is connected with the first input end of subtraction circuit.When comparison signal input high level, NMOS opens, and subtracter enters subtraction mode of operation, and when comparison signal is input as low level, NMOS closes, and subtracter enters follows mode of operation.Use NMOS tube, transfer overvoltage penalty values is little, and circuit structure is simple, and device is few, only uses the output signal of follow-up comparator, need not all the other signal lead.
Those of ordinary skill in the art can be drawn by simple computation, to M level subtracter,
Under subtraction mode of operation:
--------2.
Following under mode of operation:
---------3.
Wherein VO
mbe the output voltage of M level subtracter, VP
mbe the power and position voltage input end B of M level subtracter
minput voltage value, according to annexation mentioned above, its value be power and position voltage generating module export power and position voltage VP
m, VO
m-1for the output voltage of upper level subtracter.Here M be greater than 1 positive integer, to the situation of M=1,2. above-mentioned and VO 3. in formula
m-1equal the analog voltage XIN inputted.
Power and position voltage comparator is last output stage of the present invention, output digit signals after the voltage that each subtracter is exported and power and position voltage compare, the digital signal exported exports as analog-to-digital data, also outputs to the operating state selection circuit of subtracter for controlling the operating state of subtracter simultaneously.
Comparator at different levels, except possessing above-mentioned functions, also provides the driving force of output signal simultaneously, and by selecting the comparator chip that driving force is strong, the routing line width of selection and comparison device output, easily provides strong driving force, realize high speed analog-to-digital conversion.
Preferably, comparator chip selects LM2901.LM2901 is with low cost, and driving force is strong.
Along with the reduction of power and position voltage, the magnitude of voltage that comparator will compare constantly reduces, normally work to meet comparator, the comparator that common-mode input range is low can be selected, also can at the very low comparators at different levels of these input voltages, such as input voltage is lower than the preposition increase level displacement circuit of 0.1V comparator input terminal at different levels, such as two triodes, input voltage is connected to the base stage of triode, emitter is connected to the input of comparator, triode bias state is rationally set, such as NPN is managed, make grounded collector, emitter connects DC positive power by a resistance, triode is made to be in amplification region work, an overall lifting VBE voltage (emitter-collector voltage of triode) of the voltage that will compare.
Due to the weak phenomenon of the strong P of common N, namely because NMOS carrier mobility is better than PMOS, therefore to present pull-up ability weak for general output-stage circuit, and pull-down capability is strong.Preferably, described output G
1~ G
nall be connected with a DC positive power by resistance, such as a 10K Chip-R, to improve the pull-up ability of output, namely improve output end voltage from the low maximum voltage value that can reach toward the speed of High variation.
For operation principle of the present invention is better described, with the conversion accuracy of 8, power voltage successively decreases with 50% ratio geometric ratio and is set to example, and the course of work of the present invention is described in detail in detail.
Power and position voltage generating module adopts R-2R network as mentioned before, and the power and position voltage of output is respectively:
VREF、VREF/2、VREF/4、 VREF/8、 VREF/16、VREF/32、VREF/64、VREF/128;
Described cascade voltage subtracter comprises 7 subtracters, and the operating state selection circuit of subtraction circuit is NMOS tube; Described power and position voltage comparator comprises 8 comparators.
First order comparator compares input voltage XIN and power and position voltage VREF, exports comparison signal GO
1
Input voltage XIN and power and position voltage VREF subtracts each other by first order subtracter, exports analog voltage VO
1
As XIN>VREF, GO
1=1
---------4.
During XIN<VREF, GO
1=0
---------5.
Analyze and 4. and 5. can comprehensively draw:
--------⑥
2. and 3. according to described from the second level above, the different output voltages that each subtracter is operated in subtraction operating state and follows operating state express formulas:
--------②
---------③
Comprehensive 2. and 3. formula, can draw:
----------⑦
Then the analog voltage of the first to seven grade of subtracter output is followed successively by:
wherein M=2 ~ 7
The first to eight grade of comparator compares VO respectively
mwith VREF/2
m-1, export comparison signal GO respectively
m, wherein M=1 ~ 7.
Utilize above-mentioned 8 analog to digital conversion circuits, can realize the analog-to-digital conversion of analog voltage and export eight-digit number word signal, such as XIN=2.355V, VREF=1.28V, utilize above-mentioned various, the eight-digit number word signal that can obtain finally exporting is that the figure place from high to low of G=11101011, G equals above-mentioned GO respectively
1~ GO
8.
According to G=11101011, and formula 1.
------①
Wherein N=1 ~ 8, VP
nfor power voltage at different levels, here
.
XO=2.35V can be obtained, relative XIN=2.355V, theoretical error
Δ=5 millivolt/2.355V=0.21%.
According to simple mathematical derivation, easily show that above-mentioned theory error is relevant with reference voltage value with analog-to-digital design accuracy figure place.
The resolution of relative input voltage XIN:
Visible by increasing progression N, higher resolution can be obtained, reach higher A/D conversion accuracy.
Analog-digital commutator in parallel of the present invention, city or field data collection field can be applied to, Fig. 4 is that typical case of the present invention uses schematic diagram, to the detecting of the analog voltage token state such as temperature, air-flow, electromagnetic radiation and signal transmission in above-mentioned field, to the volume of device and power consumption requirements all not high, because extraneous factor is fast changing, wish signal energy Real-time Collection and transmission, although chip circuit achieves small size and low-power consumption, sacrifice analog-to-digital speed and precision.And under above-mentioned applied environment, analog-digital commutator is emphasized to realize high accuracy and high speed simultaneously.This is not that general integrated circuit analog-to-digital conversion chip easily realizes.
For reducing described analog-digital commutator in parallel, the double-sided PCB board layout modules of multilayer cabling can be adopted.The modules of described analog-digital commutator in parallel is arranged on two use faces of pcb board.The area of pcb board can be reduced.Utilize multilayer cabling, the signal transmission strength between module can be strengthened.
A kind ofly based on the preferred implementation on the double-sided PCB board of above-mentioned multilayer cabling be, described pcb board comprises the first use face and the second use face, the power and position voltage comparator of described parallel analog-digital signal reforming unit is arranged on the first use face of pcb board, power and position voltage generating module and cascade voltage subtracter are arranged on the second use face of pcb board, such power and position voltage is directly inputted to the input of the higher cascade voltage subtracter of required precision, reduce transmission error on line, the double power and position voltage comparator doing output stage is arranged on the second use face simultaneously, the digital signal exported and power and position voltage, the analog signals such as the voltage that subtracter exports are isolated by pcb board, reduce interfering with each other between digital and analogue signals.Second use face only has power and position voltage comparator, more than the relative rich of space, being conducive to improving increases driving stage, adds wide power and signal lead, strengthens driving force, promote output speed.
Adopt analog-digital commutator in parallel of the present invention, each components and parts and between line be arranged on pcb board, can unrestricted choice layout type, line live width and cabling mode, transform precision can be realized by the simple progression increasing subtracter and comparator, coordinate to select to export and drive strong comparator chip, reaching high-precision while, high speed can be realized.
Power and position voltage generating module of the present invention is made up of chip and resistor network, is easy to the detection range expanding input analog signal; Can select different operating voltages and driving force by selection and comparison device and operational amplifier chip, therefore digital-to-analogue reforming unit in parallel of the present invention can work under the supply voltage of relative broad range, and is easy to provide stronger output driving force.
Previously described is the preferred embodiments of the present invention, and the design parameter in described embodiment and embodiment is only the invention proof procedure in order to clear statement inventor, illustrates of the present inventionly to realize principle; And be not used to limit scope of patent protection of the present invention; scope of patent protection of the present invention is still as the criterion with its claims; the equivalent structure change that every utilization specification of the present invention and accompanying drawing content are done, in like manner all should be included in protection scope of the present invention.
Claims (9)
1. a parallel analog-digital signal conversion device, comprises power and position voltage generating module (2), cascade voltage subtracter (3), power and position voltage comparator (4), input (1) and N number of digital output end G
1~ G
n; Each part mentioned above and the line between them are all arranged on same PCB;
Power and position voltage generating module (2): generate power and position voltage, comprises the reference voltage generation module producing reference voltage and resistor network reference voltage dividing potential drop being produced power and position voltage, also comprises N number of power and position voltage output end A
1~ A
n; Resistor network by reference voltage dividing potential drop, reference voltage and power and position voltage output end A
1connect, each dividing point V
1~ V
n-1respectively with power and position voltage output end A
2~ A
nconnect;
Cascade voltage subtracter (3): voltage subtraction computing cascaded operational is carried out to the analog voltage of input, exports N-1 analog voltage O
1~ O
n-1, O
1for input voltage deducts reference voltage, from O
2start
When
:
When
:
Wherein VO
mbe M analog voltage O
mmagnitude of voltage, VP
mfor power and position voltage generating module output terminals A
mpower and position magnitude of voltage,
Power and position voltage comparator (4): the digital comparison signal D generating N number of output
1~ D
n, respectively with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect;
Wherein N be greater than 1 integer, M is the integer being greater than 1 but being not more than N;
Described power and position voltage comparator comprises N number of comparator, and each comparator comprises with to compare input, anti-phasely compares input and comparison signal output, respectively
with compare input E
1~ E
nrespectively with the power and position voltage output end A of power and position voltage generating module
1~ A
nconnect,
instead compare input F
1be connected with the input of parallel analog-digital signal conversion device, respectively anti-phasely compare input F
2~ F
nrespectively with the analog voltage output O of cascade voltage subtracter
1~ O
n-1connect, comparison signal output D
1~ D
nalso respectively with the digital output end G of described parallel analog-digital signal conversion device
1~ G
nconnect.
2. a kind of parallel analog-digital signal conversion device as claimed in claim 1, it is characterized in that: described cascade voltage subtracter (3) comprises the subtracter of N-1 cascade, each subtracter comprises operating state selection circuit and subtraction circuit, analog voltage input, power and position voltage input end, comparison signal input, analog voltage output, operating state selection circuit has control end (21), input (22) and output (23), control end (21) is connected with comparison signal input, the input (22) of operating state selection circuit is connected with power and position voltage input end, output (23) is connected with the first input end (24) of subtraction circuit, subtraction circuit comprises first input end (24), second input (25) and output (26), second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with analog voltage output, subtraction circuit is by two inputs (24, 25) voltage outputs to output after carrying out simulation additive operation, the analog voltage input I of first order voltage subtraction device
1be connected with the input (1) of parallel analog-digital signal conversion device, the analog voltage input of all the other voltage subtraction devices at different levels is connected with the analog voltage output of upper level voltage subtraction device, power and position voltage input end B at different levels
1~ B
n-1respectively with the power and position voltage output end A of power and position voltage generating module
1~ A
n-1corresponding connection, comparison signal input C at different levels
1~ C
n-1respectively with the comparison signal output D of power and position voltage comparator
1~ D
n-1corresponding connection.
3. a kind of parallel analog-digital signal conversion device as claimed in claim 1, is characterized in that: described resistor network is R-2R cascade structure, comprises the electric resistance structure R of N-1 level series connection
1~ R
n-1, electric resistance structure R
1~ R
n-1include the first resistance (31) and second resistance (32) of series connection, the resistance of the first resistance (31) and the second resistance (32) is than being 1:2, first resistance (31) and the second resistance (32) be connected in series a little for being connected in series point (33), another free end of first resistance (31) and the second resistance (32) is respectively the first resistance free end (34) and the second resistance free end (35), second resistance free end (35) ground connection, first resistance free end (34) of every grade of electric resistance structure is connected with the point (33) that is connected in series of upper level electric resistance structure, first resistance free end (34) of first order electric resistance structure is connected with the reference voltage output end of reference voltage generation module, each electric resistance structure R
1~ R
n-1the point (33) that is connected in series be described dividing point V
1~ V
n-1, respectively with described power and position voltage output end A
2~ A
nconnect, the reference voltage output end of reference voltage generation module is also connected to power and position voltage output end A
1.
4. a kind of parallel analog-digital signal conversion device as claimed in claim 1, is characterized in that: described power and position voltage generating module also comprises N number of voltage follower, the input of N number of voltage follower respectively with the dividing point V of reference voltage and resistor network
1~ V
n-1connect, N number of voltage follower output respectively with power and position voltage output end A
1~ A
nconnect.
5. a kind of parallel analog-digital signal conversion device as claimed in claim 2, it is characterized in that: described subtraction circuit comprises operational amplifier (41), the 3rd resistance (42) that resistance is identical, 4th resistance (43), 5th resistance (44), 6th resistance (45), operational amplifier comprises in-phase input end, inverting input and output, 3rd resistance (42) is connected with the 4th resistance (43), series connection point is connected with inverting input, the free end of the 3rd resistance (42) is connected with the first input end (24) of subtraction circuit, the free end of the 4th resistance (43) is connected with the output of operational amplifier, 5th resistance (44) is connected with the 6th resistance (45), and series connection point is connected with in-phase input end, and the free end of the 5th resistance (44) is connected with second input (25) of subtraction circuit, the free ending grounding of the 6th resistance (45).
6. a kind of parallel analog-digital signal conversion device as claimed in claim 2, it is characterized in that: described operating state selection circuit is a NMOS tube, the grid of NMOS is connected with comparison signal input, source electrode is connected with power and position voltage input end with substrate, and drain electrode is connected with the first input end (24) of subtraction circuit.
7. a kind of parallel analog-digital signal conversion device as claimed in claim 1, is characterized in that: described output G
1~ G
nall be connected with a DC positive power by resistance.
8. a kind of parallel analog-digital signal conversion device as claimed in claim 1, it is characterized in that: described PCB can multilayer wiring and two-sided layout use, and the modules of described parallel analog-digital signal conversion device is arranged in two different use faces of pcb board: first uses on face and the second use face.
9. a kind of parallel analog-digital signal conversion device as claimed in claim 8, it is characterized in that: the power and position voltage comparator of described parallel analog-digital signal conversion device and digital output end are arranged on the first use face of pcb board, input, power and position voltage generating module and cascade voltage subtracter are arranged on the second use face of pcb board.
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| CN201210336525.3A CN102868405B (en) | 2012-09-13 | 2012-09-13 | A kind of parallel analog-digital signal conversion device |
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| CN102868405B true CN102868405B (en) | 2015-07-29 |
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| CN108880551B (en) * | 2018-07-02 | 2022-05-24 | 京东方科技集团股份有限公司 | Mainboard circuit, display module assembly and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2348752A (en) * | 1999-04-07 | 2000-10-11 | Poramaste Jinupun | Analog to digital converter |
| CN1487672A (en) * | 2002-09-30 | 2004-04-07 | 陈启星 | Direct staging parallel A/D conversion method |
| CN101179273A (en) * | 2006-11-08 | 2008-05-14 | 索尼株式会社 | Analog-digital convertor |
Family Cites Families (1)
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|---|---|---|---|---|
| CN202750073U (en) * | 2012-09-13 | 2013-02-20 | 成都驰通数码***有限公司 | Parallel analog-to-digital signal conversion apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2348752A (en) * | 1999-04-07 | 2000-10-11 | Poramaste Jinupun | Analog to digital converter |
| CN1487672A (en) * | 2002-09-30 | 2004-04-07 | 陈启星 | Direct staging parallel A/D conversion method |
| CN101179273A (en) * | 2006-11-08 | 2008-05-14 | 索尼株式会社 | Analog-digital convertor |
Non-Patent Citations (1)
| Title |
|---|
| 流水线结构模数转换器的分析与设计;唐政媛等;《电子世界》;20120731(第14期);第113-116页 * |
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