CN102868405A - Parallel analog-digital signal conversion device - Google Patents
Parallel analog-digital signal conversion device Download PDFInfo
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- CN102868405A CN102868405A CN2012103365253A CN201210336525A CN102868405A CN 102868405 A CN102868405 A CN 102868405A CN 2012103365253 A CN2012103365253 A CN 2012103365253A CN 201210336525 A CN201210336525 A CN 201210336525A CN 102868405 A CN102868405 A CN 102868405A
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Abstract
The invention relates to a parallel analog-digital signal conversion device, which comprises a power voltage generation module, a cascaded voltage subtractor, a power voltage comparer, an input end and N digital output ends; and all the parts and connecting wires among the parts are arranged on the same PCB (Printed Control Board). The power voltage generation module is used for generating a power voltage; the cascaded voltage subtractor is used for carrying out voltage subtraction on an input analog voltage; and the power voltage comparer is used for generating an output digital comparison signal. Due to adoption of the parallel analog-digital signal conversion device, all the components and the connecting wires among the components are arranged on the PCB, layout modes, connecting wire widths and wiring modes can be freely selected, the conversion precision can be achieved by increasing the levels of the subtractor and the comparer; and the parallel analog-digital signal conversion device can achieve high precision and high speed simultaneously by cooperatively selecting a comparer with strong output drive.
Description
Technical field
The present invention relates to a kind of modulus signal conversion equipment in parallel.
Background technology
Along with developing rapidly of Digital Electronic Technique, the application of various digital devices, particularly digital computer is increasingly extensive, almost is penetrated among all spectra of national economy.Digital computer is merely able to digital signal is processed, result or the digital quantity processed, it is when automatically controlling for the production of process, variable to be dealt with is the continually varying physical quantity often, all be analog quantity such as temperature, pressure, speed etc., the analog quantity of these non-electronic signals will become voltage or current signal through transducer first, 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; Finish analog-to-digital circuit and be called as the A/D transducer, be called for short ADC (Analog to Digital Converter).Analog signal is converted to the signal of telecommunication by transducer, sends into the AD transducer through amplification and is converted to digital quantity, is processed by digital circuit.In order to guarantee the accuracy of data processed result, AD converter must have enough conversion accuracies.Simultaneously, for the control that adapts to Fast Process and the needs of detection, AD converter also must have enough fast conversion speed.Therefore, conversion accuracy and conversion speed are to weigh the outstanding feature of AD converter and DA converter performance quality.
Existing high speed or high precision analogue conversion all are to adopt special-purpose modulus conversion chip, not only expensive, procurement cycle is long, and because the limitation that integrated chip is made, so that these modulus conversion chips are difficult to satisfy simultaneously to possess simultaneously high accuracy and high-speed requirement, 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, and precision is then not high.The area that chip is limited and inner trace width have limited speed and the precision property of modulus conversion chip.
Summary of the invention
Can not satisfy the defective that possesses simultaneously high accuracy and high-speed requirement for overcoming modulus conversion chip, the invention provides a kind of analog-digital commutator in parallel:
Technical scheme of the present invention is as follows: a kind of modulus signal conversion equipment in parallel comprises power and position voltage generating module (2), cascade voltage subtracter (3), power and position voltage comparator (4), input (1) and N digital output end G
1~ G
NEach part mentioned above and the line between them all are arranged on the same PCB;
Power and position voltage generating module (2): generate power and position voltage, comprise the reference voltage generation module that produces reference voltage and the resistor network that the reference voltage dividing potential drop is produced power and position voltage, also comprise N power and position voltage output end A
1~ A
NResistor network is the 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): the aanalogvoltage to input carries out voltage subtraction cascade computing, exports N-1 aanalogvoltage O
1~ O
N-1, O
1For input voltage deducts reference voltage, from O
2Beginning
When
:
When
:
VO wherein
MBe M aanalogvoltage O
MMagnitude of voltage, VP
MBe power and position voltage generating module output terminals A
MThe power and position magnitude of voltage,
Power and position voltage comparator (4): the digital comparison signal D that generates N output
1~ D
N, respectively with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect;
Wherein N is the integer greater than 1, and M is for greater than 1 but be not more than the integer of N.
Concrete, 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 I
1~ I
N-1, power and position voltage input end B
1~ B
N-1, comparison signal input C
1~ C
N-1, aanalogvoltage output O
1~ O
N-1Operating state selects circuit that control end (21) is arranged, input (22) and output (23), control end (21) is connected with the comparison signal input, operating state selects the input (22) of circuit to be connected with the 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), the second input (25) and output (26), the second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with the aanalogvoltage output, and subtraction circuit is with two inputs (24), (25) voltage outputs to output after simulating additive operation; The analog voltage input I of first order voltage subtracter
1Be connected with the input (1) of modulus signal conversion equipment in parallel, the analog voltage input of the voltage subtracter that all the other are at different levels links to each other with the aanalogvoltage output of upper level voltage subtracter; Power and position voltage input end B at different levels
1-B
N-1Respectively with the power and position Voltage-output A of power and position voltage generating module
1~ A
N-1End is corresponding to connect 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-1The corresponding connection.
Concrete, described power and position voltage comparator comprises N comparator, each comparator comprises with comparing input E
1~ E
N, anti-phase relatively input F
1~ F
NWith comparison signal output D
1~ D
N, each anti-phase relatively input E
1~ E
NPower and position voltage output end A with the power and position voltage generating module
1~ A
NConnect, with comparing input F
1Be connected F with the input of modulus signal conversion equipment in parallel
2~ F
NAanalogvoltage output O with the cascade voltage subtracter
1~ O
N-1Connect comparison signal output D
1~ D
NAlso with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect.
Concrete, described resistor network is the 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 links to each other 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 that utilizes above-mentioned resistor network structure to obtain is to reduce successively 50% geometric ratio voltage, and 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 voltage follower, the dividing point V of the input of N voltage follower and reference voltage and resistor network
1~ V
N-1Connect N voltage follower output and power and position voltage output end A
1~ A
NConnect.Each power and position voltage driving force that the resistor network dividing potential drop produces is different, and each power and position voltage linked to each other by circuit, easily influences each other.Adopt voltage follower to increase on the one hand power and position voltage driving force, shielded on the one hand influencing each other between each power and position voltage.
Concrete, described subtraction circuit comprises four resistance that operational amplifier is identical with resistance, resistance and operational amplifier are connected into the form of feedback, by feedback two input terminal voltages of operational amplifier are equated, realize the voltage subtraction.
Concrete, it is the NMOS pipe that described operating state is selected circuit, and the grid of NMOS is connected with the comparison signal input, and source electrode is connected with the 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 when being high, carry out subtraction, when the comparison signal input terminal voltage when 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.Draw ability on the raising output.
Preferably, use but described pcb board is multilayer wiring and two-sided layout, the modules of described modulus signal reforming unit in parallel is arranged in two different use faces of pcb board: on the first use face and the second use face, and volume that can reduction means.
Further, the power and position voltage comparator of described modulus signal reforming unit in parallel 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 improve precision and speed.
Adopt analog-digital commutator in parallel of the present invention, each components and parts and between line be arranged on the pcb board, can freely select layout type, line live width and cabling mode, transforming precision can realize by the progression of simple increase subtracter and comparator, cooperate and select output to drive strong comparator chip, can reach the high-precision while, realize high-speed.
Power and position voltage generating module of the present invention is comprised of chip and resistor network, is easy to enlarge the detection range of input analog signal; By selecting comparator and operational amplifier chip can select voltage and the driving force of different work, therefore digital-to-analogue reforming unit in parallel of the present invention can be worked under the supply voltage of relative broad range, and is easy to the output driving force that provides stronger.
Description of drawings
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 typical case of the present invention and uses schematic diagram;
Fig. 5 illustrates the implementation of a kind of voltage follower among the present invention;
In each figure, the 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. duties select circuit control end 22. duties to select circuit input end 23. duties to select circuit output end 24. subtraction circuit first input end 25. subtraction circuit the second input 26. subtraction circuit output 31. first resistance 32. second resistance 33. to be connected in series a little 34. first resistance free end 35. second resistance free end 41. operational amplifier 42 ~ 45. subtraction circuit 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-phase relatively input F
1~ F
N
Digital output end G
1~ G
N
Analog voltage input I
1~ I
N-1
Aanalogvoltage 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 digital output end G
1~ G
NEach part mentioned above and the line between them all are arranged in same PCB(Printed circuit board printed circuit board) on;
Power and position voltage generating module (2): generate power and position voltage, comprise the reference voltage generation module that produces reference voltage and the resistor network that the reference voltage dividing potential drop is produced power and position voltage, also comprise N power and position voltage output end A
1~ A
NResistor network is the 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): the aanalogvoltage to input carries out voltage subtraction cascade computing, exports N-1 aanalogvoltage O
1~ O
N-1, O
1For input voltage deducts reference voltage, from O
2Beginning
When
:
When
:
VO wherein
MBe M aanalogvoltage O
MMagnitude of voltage, VP
MBe power and position voltage generating module output terminals A
MThe power and position magnitude of voltage,
Power and position voltage comparator (4): the digital comparison signal D that generates N output
1~ D
N, respectively with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect;
Wherein N is the integer greater than 1, and M is for greater than 1 but be not more than the integer of N.
Concrete, 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 I
1~ I
N-1, power and position voltage input end B
1~ B
N-1, comparison signal input C
1~ C
N-1, aanalogvoltage output O
1~ O
N-1Operating state selects circuit that control end (21) is arranged, input (22) and output (23), control end (21) is connected with the comparison signal input, operating state selects the input (22) of circuit to be connected with the 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), the second input (25) and output (26), the second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with the aanalogvoltage output, and subtraction circuit is with two inputs (24), (25) voltage outputs to output after simulating additive operation; The analog voltage input I of first order voltage subtracter
1Be connected with the input (1) of modulus signal conversion equipment in parallel, the analog voltage input of the voltage subtracter that all the other are at different levels links to each other with the aanalogvoltage output of upper level voltage subtracter; Power and position voltage input end B at different levels
1-B
N-1Respectively with the power and position Voltage-output A of power and position voltage generating module
1~ A
N-1End is corresponding to connect 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-1The corresponding connection.
Concrete, described power and position voltage comparator comprises N comparator, each comparator comprises with comparing input E
1~ E
N, anti-phase relatively input F
1~ F
NWith comparison signal output D
1~ D
N, each anti-phase relatively input E
1~ E
NPower and position voltage output end A with the power and position voltage generating module
1~ A
NConnect, with comparing input F
1Be connected F with the input of modulus signal conversion equipment in parallel
2~ F
NAanalogvoltage output O with the cascade voltage subtracter
1~ O
N-1Connect comparison signal output D
1~ D
NAlso with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect.
As shown in Figure 1, be power and position cascade voltage subtracter in the left side dotted line frame among the figure, comprise the subtracter of a plurality of cascades, be the power and position voltage comparator in the dotted line frame of the right, comprise a plurality of comparators, each subtracter is connected with comparator corresponding the connection.
Analog-digital commutator in parallel of the present invention is used for analog-to-digital conversion, have an input end of analog signal and a plurality of digital signal output end, the aanalogvoltage XIN of an input is converted into the long number output of output, the digital signal of each output output includes only 0 and 1 two states, each output characterizes a power and position voltage, and the digital signal by output can calculate the aanalogvoltage XO that output signal characterizes at last:
GO wherein
NCharacterize the digital signal output valve of each output, VP
NCharacterize power and position magnitude of voltage corresponding to each output, each power and position voltage is defined by the power and position voltage generating module in the described analog-to-digital conversion device in parallel, N is positive integer, the precision of aanalogvoltage is that the difference of input value XIN and XO is determined by N, N is larger, and difference is less, and precision is higher, power and position voltage is the different aanalogvoltages of a series of values, and the relation between them is determined by the resistor network of power and position voltage generating module.
A kind of implementation that the 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 the 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 electronics 31 and second resistance 32 of series connection, the resistance of the first resistance 31 and the second resistance 32 is than being 1:2,31 and 32 be connected in series a little is 33, another free end of 31 and 32 is respectively 34 and 35,35 ground connection wherein, 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 link to each other with the reference voltage output end of reference voltage generation module, each electric resistance structure R
1~ R
N-133 ends 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
1Above-mentioned resistance is little to realizing function effect of the present invention, from cost and convenient welding and the compromise consideration of power consumption aspect, can select the Chip-R of 20K.
When the reference voltage that produces when the reference voltage generation module of power and position voltage generating module was VREF, those of ordinary skills were according to Fig. 3 and mentioned above, need not creative work, easily calculate N 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 is selected chip TL431.The TL431 that TIX produces is the three end adjustable shunt reference sources that good thermal stability is arranged.Any value in its output voltage just can be set to from 2.5V to the 36V scope with two resistance arbitrarily.
Preferably, described power and position voltage generating module 2 also comprises N voltage follower, the input of N voltage follower respectively with the dividing point V of reference voltage and resistor network
1~ V
N-1Connect, N voltage follower output respectively with power and position voltage output end A
1~ A
NConnect.The realization principle of voltage follower is exactly the operational amplifier that a negative feedback connects, can adopt various negative feedback modes, 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.Because each power and position voltage driving force that the resistor network dividing potential drop produces is different, and each power and position voltage linked to each other by circuit, easily influences each other.Adopt voltage follower to increase on the one hand power and position voltage driving force, shielded on the one hand influencing each other between each power and position voltage.
Described cascade voltage subtracter 3 comprises a plurality of subtracters, first order subtracter subtracts each other rear output with input value XIN and the reference voltage V REF of input 1, from the second level, every grade of subtracter subtracts each other the output voltage of upper level subtracter with corresponding power and position magnitude of voltage, for example K level subtracter is output voltage and the power and position voltage output end A with K-1 level subtracter
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: the voltage of analog voltage input and power and position voltage input end is subtracted each other, and resulting value is exported at the aanalogvoltage output; The described operating state of following is: directly with the Voltage-output of analog voltage input to the aanalogvoltage output; The subtraction mode of operation is when the mode of operation of analog voltage input voltage greater than the voltage of power and position voltage input end; When the input voltage of analog voltage input during less than the power and position magnitude of voltage of input, because the subtracter output valve can not be for negative, the output voltage values that obtains is not equal to the difference of the two, at this moment subtracter enters and follows mode of operation, described operating state selects circuit to close, subtracter is follower, and directly the input voltage with analog voltage input outputs to the output of subtracter output.
Concrete a kind of implementation, as shown in Figure 2, described subtraction circuit comprises operational amplifier 41, the resistance 42 ~ 45 that resistance is identical, operational amplifier comprises in-phase input end, inverting input and output, resistance 42 is connected with 43, series connection point is connected with inverting input, and 42 free end is connected with the first input end of subtraction circuit, and 43 free end is connected with the output of operational amplifier, resistance 44 is connected with 45, series connection point is connected with in-phase input end, and 44 free end is connected 45 free ending grounding with the second input of subtraction circuit.Resistance 42,43 consists of feedback networks, makes that two input operating voltages equate under the operational amplifier stable state.Operational amplifier can be selected with low cost, and higher LM2902 gains.
Preferably, it is the NMOS pipe that described operating state is selected circuit, and the grid of NMOS is connected with the comparison signal input, and source electrode is connected with the power and position voltage input end with substrate, and drain electrode is connected with the first input end of subtraction circuit.When the comparison signal input high level, NMOS opens, and subtracter enters the subtraction mode of operation, and when comparison signal was input as low level, NMOS closed, and subtracter enters follows mode of operation.Use the NMOS pipe, transfer overvoltage loss value 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 skills can draw by simple computation, to M level subtracter,
Under the subtraction mode of operation:
--------2.
Following under the mode of operation:
---------3.
VO wherein
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, the power and position voltage VP that its value is exported for the power and position voltage generating module
M, VO
M-1Output voltage for the upper level subtracter.Here M is the positive integer greater than 1, to the situation of M=1, and the 2. above-mentioned and 3. VO in the formula
M-1The aanalogvoltage XIN that equals to input.
The power and position voltage comparator is last output stage of the present invention, voltage and the rear output digit signals of power and position voltage ratio with each subtracter output, the digital signal of output is exported as analog-to-digital data, and the operating state that also outputs to simultaneously subtracter selects circuit to be used for the operating state of control subtracter.
Comparators at different levels also provide the driving force of output signal simultaneously except possessing above-mentioned functions, by selecting the strong comparator chip of driving force, select the routing line width of comparator output terminal, and strong driving force easily is provided, and realize high speed analog-to-digital conversion.
Preferably, the comparator chip is selected LM2901.LM2901 is with low cost, and driving force is strong.
Reduction along with power and position voltage, the magnitude of voltage that comparator will compare constantly reduces, in order to satisfy the comparator normal operation, can select the low comparator of common-mode input range, also can be at the very low comparators at different levels of these input voltages, for example input voltage is lower than the preposition increase level displacement circuit of 0.1V comparator input terminals at different levels, two triodes for example, input voltage is connected to the base stage of triode, emitter is connected to the input of comparator, the triode bias state rationally is set, for example to the NPN pipe, make grounded collector, emitter connects dc positive power by a resistance, make triode be in amplification region work, the whole VBE voltage of lifting (emitter-collector voltage of triode) of the voltage that will compare.
Because the weak phenomenon of the strong P of common N, namely because the NMOS carrier mobility is better than PMOS, therefore general output-stage circuit presents and draws a little less than the ability, and pull-down capability is strong.Preferably, described output G
1~ G
NAll be connected with a dc positive power by resistance, for example a 10K Chip-R to draw ability on the raising output, namely improves the maximum voltage value that the speed of output end voltage from low toward High variation can reach.
For operation principle of the present invention better is described, with 8 conversion accuracy, 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.
The power and position voltage generating module adopts as mentioned before R-2R network, 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 it is the NMOS pipe that the operating state of subtraction circuit is selected circuit; Described power and position voltage comparator comprises 8 comparators.
First order comparator is input voltage XIN and power and position voltage VREF relatively, output comparison signal GO
1
First order subtracter subtracts each other input voltage XIN and power and position voltage VREF, output aanalogvoltage VO
1
As XIN〉during VREF, GO
1=1
---------4.
During XIN＜VREF, GO
1=0
---------5.
Analyze and 4. and 5. can comprehensively draw:
Described from the second level according to preamble, 3. each subtracter is operated in that 2. the subtraction operating state expresses formulas with the different output voltages of following operating state and:
Comprehensive 2. and 3. formula can draw:
Then the aanalogvoltage of first to seven grade of subtracter output is followed successively by:
First to eight grade of comparator compares respectively VO
MWith VREF/2
M-1, export respectively comparison signal GO
M, M=1 ~ 7 wherein.
Utilize above-mentioned 8 analog to digital conversion circuits, can realize the analog-to-digital conversion of aanalogvoltage and export eight-digit number word signal, for example when XIN=2.355V, VREF=1.28V, utilize above-mentioned various, the eight-digit number word signal that can finally be exported is G=11101011, and the figure place from high to low of G equals respectively above-mentioned GO
1~ GO
8
According to G=11101011, and formula 1.
N=1 ~ 8 wherein, VP
NBe power voltages at different levels, here
Can obtain XO=2.35V, relative XIN=2.355V, theoretical error
Δ=5 millivolt/2.355V=0.21%.
According to simple mathematical derivation, easily draw the above-mentioned theory error relevant with reference voltage value with analog-to-digital design accuracy figure place.
The resolution of relative input voltage XIN:
As seen by increasing progression N, can obtain higher resolution, reach higher A/D conversion accuracy.
Analog-digital commutator in parallel of the present invention, can be applied to city or field data collection field, Fig. 4 is that typical case of the present invention uses schematic diagram, detecting and signal to aanalogvoltage sign amounts such as temperature, air-flow, electromagnetic radiation in above-mentioned field transmit, volume and power consumption requirement to device are all not high, because extraneous factor is fast changing, wish signal energy Real-time Collection and transmission, although chip circuit has been realized small size and low-power consumption, analog-to-digital speed and precision have been sacrificed.And under above-mentioned applied environment, analog-digital commutator emphasizes to realize simultaneously high accuracy and high-speed.This is not that general integrated circuit analog-to-digital conversion chip is easily realized.
For dwindling described analog-digital commutator in parallel, can adopt the double-sided PCB board layout modules of multilayer cabling.The modules of described analog-digital commutator in parallel is arranged on two use faces of pcb board.Can dwindle the area of pcb board.Utilize the multilayer cabling, can strengthen the signal transmission strength between the module.
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 modulus signal reforming unit in parallel 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, power and position voltage is directly inputted to the input of the higher cascade voltage subtracter of required precision like this, reduced transmission error on the line, the double power and position voltage comparator of doing output stage is arranged on the second use face simultaneously, digital signal and the power and position voltage of output, the analog signals such as voltage of subtracter output are isolated by pcb board, have reduced interfering with each other between the digital and analogue signals.Only have the power and position voltage comparator on the second use face, more than the relative rich of space, being conducive to improve increases driving stage, adds wide power and signal lead, strengthens driving force, promotes output speed.
Adopt analog-digital commutator in parallel of the present invention, each components and parts and between line be arranged on the pcb board, can freely select layout type, line live width and cabling mode, transforming precision can realize by the progression of simple increase subtracter and comparator, cooperate and select output to drive strong comparator chip, can reach the high-precision while, realize high-speed.
Power and position voltage generating module of the present invention is comprised of chip and resistor network, is easy to enlarge the detection range of input analog signal; By selecting comparator can select different operating voltages and driving force with the operational amplifier chip, therefore digital-to-analogue reforming unit in parallel of the present invention can be worked under the supply voltage of relative broad range, and is easy to the output driving force that provides stronger.
Previously described is the preferred embodiments of the present invention, and the design parameter among described embodiment and the embodiment only is for clear statement inventor's invention proof procedure, and realization principle of the present invention is described; Be not to limit scope of patent protection of the present invention; scope of patent protection of the present invention still is as the criterion with its claims; the equivalent structure that every utilization specification of the present invention and accompanying drawing content are done changes, and in like manner all should be included in protection scope of the present invention.
Claims (10)
1. a modulus signal conversion equipment in parallel comprises power and position voltage generating module (2), cascade voltage subtracter (3), power and position voltage comparator (4), input (1) and N digital output end G
1~ G
NEach part mentioned above and the line between them all are arranged on the same PCB;
Power and position voltage generating module (2): generate power and position voltage, comprise the reference voltage generation module that produces reference voltage and the resistor network that the reference voltage dividing potential drop is produced power and position voltage, also comprise N power and position voltage output end A
1~ A
NResistor network is the 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): the aanalogvoltage to input carries out voltage subtraction cascade computing, exports N-1 aanalogvoltage O
1~ O
N-1, O
1For input voltage deducts reference voltage, from O
2Beginning
When
:
When
:
VO wherein
MBe M aanalogvoltage O
MMagnitude of voltage, VP
MBe power and position voltage generating module output terminals A
MThe power and position magnitude of voltage,
Power and position voltage comparator (4): the digital comparison signal D that generates N output
1~ D
N, respectively with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect;
Wherein N is the integer greater than 1, and M is for greater than 1 but be not more than the integer of N.
2. a kind of modulus signal conversion equipment in parallel 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 that operating state selects 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, aanalogvoltage output O
1~ O
N-1Operating state selects circuit that control end (21) is arranged, input (22) and output (23), control end (21) is connected with the comparison signal input, operating state selects the input (22) of circuit to be connected with the 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), the second input (25) and output (26), the second input of subtraction circuit is connected with analog voltage input, the output of subtraction circuit is connected with the aanalogvoltage output, and subtraction circuit is with two inputs (24), (25) voltage outputs to output after simulating additive operation; The analog voltage input I of first order voltage subtracter
1Be connected with the input (1) of modulus signal conversion equipment in parallel, the analog voltage input of the voltage subtracter that all the other are at different levels links to each other with the aanalogvoltage output of upper level voltage subtracter; Power and position voltage input end B at different levels
1-B
N-1Respectively with the power and position Voltage-output A of power and position voltage generating module
1~ A
N-1End is corresponding to connect 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-1The corresponding connection.
3. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: described power and position voltage comparator comprises N comparator, each comparator comprises with comparing input E
1~ E
N, anti-phase relatively input F
1~ F
NWith comparison signal output D
1~ D
N, each anti-phase relatively input E
1~ E
NPower and position voltage output end A with the power and position voltage generating module
1~ A
NConnect, with comparing input F
1Be connected F with the input of modulus signal conversion equipment in parallel
2~ F
NAanalogvoltage output O with the cascade voltage subtracter
1~ O
N-1Connect comparison signal output D
1~ D
NAlso with the digital output end G of described modulus signal conversion equipment in parallel
1~ G
NConnect.
4. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: described resistor network is the 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, (31) and being connected in series a little of (32) be (33), (31) and another free end of (32) be respectively (34) and (35), (35) ground connection, (34) end of every grade of electric resistance structure is connected with (33) end of upper level electric resistance structure, (34) end of first order electric resistance structure links to each other each electric resistance structure R with the reference voltage output end of reference voltage generation module
1~ R
N-1(33) end 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
5. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: described power and position voltage generating module also comprises N voltage follower, the input of N voltage follower respectively with the dividing point V of reference voltage and resistor network
1~ V
N-1Connect, N voltage follower output respectively with power and position voltage output end A
1~ A
NConnect.
6. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: described subtraction circuit comprises operational amplifier (41), the resistance that resistance is identical (42) ~ (45), operational amplifier comprises in-phase input end, inverting input and output, resistance (42) is connected with (43), series connection point is connected with inverting input, and the free end of (42) is connected with the first input end of subtraction circuit (24), and the free end of (43) is connected with the output of operational amplifier; Resistance (44) is connected with (45), and series connection point is connected with in-phase input end, and the free end of (44) is connected the free ending grounding of (45) with second input (25) of subtraction circuit.
7. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: it is a NMOS pipe that described operating state is selected circuit, the grid of NMOS is connected with the comparison signal input, source electrode is connected with the power and position voltage input end with substrate, and drain electrode is connected with the first input end (24) of subtraction circuit.
8. a kind of modulus signal conversion equipment in parallel as claimed in claim 1 is characterized in that: described output G
1~ G
NAll be connected with a dc positive power by resistance.
9. a kind of modulus signal conversion equipment in parallel as claimed in claim 1, it is characterized in that: use but described PCB is multilayer wiring and two-sided layout, the modules of described modulus signal reforming unit in parallel is arranged in two different use faces of pcb board: on the first use face and the second use face.
10. a kind of modulus signal conversion equipment in parallel as claimed in claim 9, it is characterized in that: the power and position voltage comparator of described modulus signal reforming unit in parallel and digital output end are arranged on the first use face of pcb board, and 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210336525.3A CN102868405B (en) | 2012-09-13 | 2012-09-13 | A kind of parallel analog-digital signal conversion device |
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| Publication Number | Publication Date |
|---|---|
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| CN102868405B CN102868405B (en) | 2015-07-29 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089758A1 (en) * | 2013-12-18 | 2015-06-25 | 海能达通信股份有限公司 | Voltage regulation circuit system |
| CN108880551A (en) * | 2018-07-02 | 2018-11-23 | 京东方科技集团股份有限公司 | Motherboard circuit, display module and display device |
Citations (4)
| 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 |
| CN202750073U (en) * | 2012-09-13 | 2013-02-20 | 成都驰通数码系统有限公司 | Parallel analog-to-digital signal conversion apparatus |
-
2012
- 2012-09-13 CN CN201210336525.3A patent/CN102868405B/en active Active
Patent Citations (4)
| 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 |
| CN202750073U (en) * | 2012-09-13 | 2013-02-20 | 成都驰通数码系统有限公司 | Parallel analog-to-digital signal conversion apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 唐政媛等: "流水线结构模数转换器的分析与设计", 《电子世界》, no. 14, 31 July 2012 (2012-07-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089758A1 (en) * | 2013-12-18 | 2015-06-25 | 海能达通信股份有限公司 | Voltage regulation circuit system |
| CN108880551A (en) * | 2018-07-02 | 2018-11-23 | 京东方科技集团股份有限公司 | Motherboard circuit, display module and display device |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102868405B (en) | 2015-07-29 |
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