CN108649954A - A kind of cursor type high-precision high-speed A/D conversion equipments - Google Patents
A kind of cursor type high-precision high-speed A/D conversion equipments Download PDFInfo
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- CN108649954A CN108649954A CN201810735097.9A CN201810735097A CN108649954A CN 108649954 A CN108649954 A CN 108649954A CN 201810735097 A CN201810735097 A CN 201810735097A CN 108649954 A CN108649954 A CN 108649954A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/1205—Multiplexed conversion systems
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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Abstract
The present invention relates to a kind of cursor type high-precision high-speed A/D conversion equipments.The present invention includes m converting unit, and A/D conversion of each converting unit for one section of continuous digit further includes：1 switching group that rounds up of m, the converting unit of the corresponding position section of input terminal connection for the switching group that each rounds up, the minimum amount of voltage that for exporting the bleeder circuit output bigger than being measured voltage in the converting unit of corresponding position section；The downward rounding switching groups of m 2, the converting unit of the corresponding position section of input terminal connection of each switching group of rounding downwards, the maximum voltage value for exporting the bleeder circuit output smaller than being measured voltage in the converting unit of corresponding position section；Data latches, input terminal step-by-step section are sequentially connected the digital signal of m converting unit output from high to low, are used for the synchronism output of digital signal.Constantly refinement is carried out to voltage to be converted to measure, while ensureing A/D conversion accuracy, improve the speed of conversion using the vernier of different accuracy.
Description
Technical field
The present invention relates to high-precision high-speed A/D switch technologies field, specifically a kind of cursor type high-precision high-speed A/D
Conversion equipment.
Background technology
Analog signal is converted to the important interface that digital signal (analog-to-digital conversion) is all reality systems and information system, is
Information system perceive reality system must be by channel.So modulus conversion technique is the industries such as modern scientist, communication, information
One of basic technology has very important basic meaning.
There are mainly four types of current modulus conversion techniques：Parallel transformation method, successive appraximation method, double integration method, voltage to frequency conversion
Method.Parallel comparison method is exactly to divide equally reference voltage using a resistor network, the equal score value of each voltage and input analog voltage
It is compared, comparison result input decoder is formed number；The advantages of Parallel transformation method is that the speed of analog-to-digital conversion is fast, disadvantage
Be circuit scale with conversion digit increase by geometric progression so that high precision analogue conversion under cannot achieve or realize
It is too big to carry out cost.Successive appraximation method is that digital quantity highest order is set as 1, remaining position is set as 0, is converted to analog quantity, conversion
Analog quantity afterwards is compared with the analog quantity of input, if the analog quantity of input is higher than the analog quantity of conversion, highest order is protected
Hold 1 constant, if the analog quantity of input is lower than the analog quantity of conversion, turning highest order becomes 0, and have thus determined highest orders, then
The advantages of value for determining binary digit below successively, gradually compares, and finally obtains transformation result, successive appraximation method is conversion circuit
Scale and convert the precision of digit as algebraic series, the disadvantage is that convert speed it is slower, need to obtain by multiple conversions
To result.Double integration method is that input analog voltage is converted to time span, then time of measuring length, obtains number to the end
Amount, voltage to frequency conversion method is exactly to convert voltages into frequency, then obtains digital value by measurement frequency；Two methods are converted below
Precision do not influence the scale of circuit, but conversion speed is very slow.
In analog-to-digital conversion, also a kind of more bit Pipeline ADC methods, each conversion links use compared with
Few number of bits is constituted parallel relatively, is encoded more afterwards parallel；On the one hand coding is a part for transformation result, another
Aspect carries out digital-to-analogue conversion to coding, and digital-to-analogue conversion result is subtracted each other with this grade of output signal, then is scaled up, and is sent into next stage
Compared parallel.More bit Pipeline ADCs have theoretic high-precision high-speed, but due to converted
Cheng Zhong needs to do analog subtraction operation and signal enhanced processing step by step, so that is produced during simulation trial and amplification
Raw error can constantly amplify so that in high precision analogue conversion, the error of system is easy to cover the precision measured, institute
It is industrially difficult to realize high-precision conversion with more bit Pipeline ADCs.
By being found to existing modulus conversion technique analysis, cannot get both between the conversion accuracy and speed of analog-to-digital conversion,
Current technology all can not achieve the high-precision and high speed of analog-to-digital conversion, or realize that cost is too high, so that in reality
It can not be born in commercial Application.
Invention content
Place aiming at the above shortcomings existing in the prior art, the technical problem to be solved in the present invention is to provide a kind of verniers
Formula high-precision high-speed A/D conversion equipments.
Present invention technical solution used for the above purpose is：A kind of cursor type high-precision high-speed A/D converting means
It sets, including m converting unit, A/D conversion of each converting unit for one section of continuous digit further includes：
The m-1 switching groups that round up, the converting unit of the corresponding position section of input terminal connection for the switching group that each rounds up,
Minimum amount of voltage that for exporting the bleeder circuit output bigger than being measured voltage in the converting unit of corresponding position section；
The m-2 switching groups of rounding downwards, the converting unit of the corresponding position section of input terminal connection of each switching group of rounding downwards,
Maximum voltage value for exporting the bleeder circuit output smaller than being measured voltage in the converting unit of corresponding position section；
Data latches, input terminal step-by-step section are sequentially connected the digital signal of m converting unit output, are used for from high to low
The synchronism output of digital signal.
The first converting unit of highest order includes in the converting unit：
First equal bleeder circuit, input terminal connect reference voltage Vref, it is used for reference voltage VrefIt is divided into 2n1Equal portions, wherein
N1 for the obtained digital signal of the first converting unit digit；
First comparison circuit, input terminal connects the output end of the first equal bleeder circuit and measured voltage, for that will be tested
Amount voltage is compared with the output voltage of the first equal bleeder circuit respectively, is measured the same mutually defeated of each comparator of control source
Enter end, the inverting input of the corresponding comparator of output voltage input of the first equal voltage division circuit obtains pair according to comparison result
The low and high level answered；
First decoder, input terminal connects the output end of comparison circuit, for the output result of comparison circuit to be compiled as
N1 position digital signals, the ascending high level quantity exported with the first comparison circuit of numerical value for decoding output are right from less to more
It answers.
The second converting unit to the m-1 converting units of interposition include in the converting unit：
Equal bleeder circuit, the output end and size of the input terminal connection downward rounding switching group of upper level are to be superimposed upon upper level
The equal bleeder circuit of upper level on the output voltage of downward rounding switching group divides equally the reference voltage of voltage value, is used for benchmark
Voltage is divided into 2nsEqual portions, wherein ns are the digit of the obtained digital signal of the converting unit, and s is more than 1 and less than m's
Integer；
It is superimposed equal bleeder circuit, it is that the equal bleeder circuit of upper level divides equally voltage value that input terminal connection, which is measured voltage and size,
Reference voltage, for reference voltage to be divided into 2nsEqual portions, and be superimposed upon on measured voltage；
Comparison circuit, input terminal connection upper level round up the defeated of switching group output end and this grade of equal bleeder circuit of superposition
Outlet, the round up output voltage of switching group output end of upper level input the in-phase input end of each comparator, the superposition of this grade
The output voltage of equal bleeder circuit is input to the inverting input of corresponding comparator, and corresponding height electricity is obtained according to comparison result
It is flat；
Decoder, input terminal connects the output end of comparison circuit, for the output result of comparison circuit to be compiled as ns
Digital signal, the ascending high level quantity exported with comparison circuit of numerical value for decoding output are corresponding from less to more.
The m converting units of lowest order include in the converting unit：
M is superimposed equal bleeder circuit, is measured the benchmark that voltage and size divide equally voltage value for the equal bleeder circuit of upper level
Voltage, for reference voltage to be divided into 2nmEqual portions, and be superimposed upon on measured voltage, wherein nm is the m converting units
The digit of obtained digital signal；
M comparison circuits, input terminal connection m-1 rounds up the output end of switching group and m is superimposed equal bleeder circuit
Output end, m-1 round up switching group output end output voltage input each comparator in-phase input end m it is folded
Add the output voltage of equal bleeder circuit to be input to the inverting input of corresponding comparator, corresponding height is obtained according to comparison result
Level；
M decoders, input terminal connect the output end of m comparison circuits, for compiling the output result of m comparison circuits
Nm position digital signals are translated into, wherein nm is the digit of the obtained digital signal of m converting units, decodes the number of output
It is corresponding from less to more to be worth the ascending high level quantity exported with m comparison circuits.
The switching group that rounds up includes 2n1It switchs and one 2n1The logical unit of position；
Described 2n1The input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the defeated of logical unit
Outlet, output end Parallel opertation；
The output end of the input terminal connection comparison circuit of the logical unit, for control it is described switch on-off,
Make to round up switching group output voltage be the equal bleeder circuit output bigger than measured voltage minimum amount of voltage that.
The switching group that rounds up includes 2nsIt is a to switch and one 2nsThe logical unit of position；
Described 2nsThe input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the defeated of logical unit
Outlet, output end Parallel opertation；
The input terminal of the logical unit connects the output end of equal bleeder circuit, for controlling the logical of the switch
Disconnected, the output voltage for the switching group that makes to round up is the minimum amount of voltage that the equal bleeder circuit bigger than measured voltage exports.
The downward rounding switching group includes 2n1It is a to switch and one 2n1The logical unit of position；
Described 2n1The input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the defeated of logical unit
Outlet, output end Parallel opertation；
The input terminal connection comparison circuit of the logical unit or the output end of equal bleeder circuit, it is described for controlling
It switches on-off, the output voltage for the switching group that makes to round up is the maximum electricity of the equal bleeder circuit output smaller than measured voltage
Pressure value.
The downward rounding switching group includes 2nsIt is a to switch and one 2nsThe logical unit of position, wherein s are more than 1
And the integer less than m-1；
Described 2nsThe input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the defeated of logical unit
Outlet, output end Parallel opertation；
The input terminal connection comparison circuit of the logical unit or the output end of equal bleeder circuit, it is described for controlling
It switches on-off, the output voltage for the switching group that makes to round up is the maximum electricity of the equal bleeder circuit output smaller than measured voltage
Pressure value.
The present invention has the following advantages and beneficial effects：
1, the present invention uses conversion circuit to carry out tested voltage step by step in analog signal is converted to digital signal processes
Refinement measures；Amplifying element is calculated without using digital-to-analogue conversion link, without using simulation, to ensure the same of A/D conversion accuracy
When, the speed of conversion can be improved, the needs of high-precision high-speed analog-to-digital conversion are met, with simple in structure, systematic error is small, turns
Change precision, at high speed it is fast the advantages that, have critically important application value.
2, the present invention carries out voltage conversion using cursor type, and carrying out analog-to-digital conversion to voltage can regard as using with a scale
Voltage scale voltage is measured.
3, difference operation and signal enhanced processing need not be simulated, the systematic error brought by simulation trial is avoided.
4, digital-to-analogue conversion is not needed, conversion speed is improved, simplifies circuit structure, reduces complexity in circuits.
5, in conversion circuit, it is only necessary to it switchs, comparator, the units such as logical operation, these circuit unit stability are good,
Bandwidth, arithmetic speed are fast, accelerate the speed of analog-to-digital conversion, improve the bandwidth of analog-to-digital conversion.
6, circuit scale does not increase with conversion digit in geometric progression, reduces the scale and complexity of circuit.
Description of the drawings
Fig. 1 is the overall structure block diagram of the present invention；
Fig. 2 is the circuit diagram of the A/D conversion portions of the present invention；
Fig. 3 is the circuit diagram of the data latch section of the present invention；
Fig. 4 is the first circuit diagram for rounding up switching group S11 in the embodiment of the present invention；
Fig. 5 is the circuit diagram of the first downward rounding switching group S12 in the embodiment of the present invention；
Fig. 6 is the second circuit diagram for rounding up switching group S21 in the embodiment of the present invention；
Fig. 7 is the circuit diagram of the second downward rounding switching group S22 in the embodiment of the present invention；
Fig. 8 is that the cursor type of the present invention carries out the schematic diagram of voltage conversion.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
The mentality of designing of A/D conversion equipments of the present invention is：Input voltage is carried out using the voltage scale of different accuracy
Directly or indirectly hybrid measurement obtains analog-digital conversion result.
Reference data voltage is divided equally by resistor network, using the voltage divided equally compared with input voltage, the number converted
Value value.It is voltage scale by the voltage that resistor network is divided equally, the equal component voltage of resistor network is relatively to defeated with input voltage
Enter voltage to measure.
First order voltage scale directly measures input voltage, remaining voltage scale is to voltage input signal into the ranks
Connect measurement.
In addition to first order voltage scale, remaining voltage scale is superimposed upon on input voltage.
In addition to first order voltage scale, the equal component voltage of remaining voltage scale is relatively fixed constant (scale relative value), but
Absolute value changes with the variation of input voltage, shape such as vernier.
In addition to first order voltage scale, the length per voltage order one scale is upper level voltage scale minimum scale value.
Per the scale of voltage order one scale, if the level conversion number of bits is N, which should
The length of step voltage scale divided by 2N。
Result per voltage order one tape measure is only to give up the analog-to-digital conversion not entered.
In addition to first order voltage scale measures, remaining voltage scale value measured directly is only given up during all grades of front measures
The voltage value not entered adds the voltage value of a previous stage voltage scale scale again after being added；By the voltage value and it is superimposed upon input
Vernier on voltage is compared, and obtains this grade of measurement result indirectly.
As shown in Figure 1, a kind of cursor type high-precision high-speed A/D conversion equipments proposed by the present invention, including m conversion are single
Member, A/D conversion of each converting unit for one section of continuous digit further include：
The m-1 switching groups that round up, the converting unit of the corresponding position section of input terminal connection for the switching group that each rounds up,
Minimum amount of voltage that for exporting the bleeder circuit output bigger than being measured voltage in the converting unit of corresponding position section；
The m-2 switching groups of rounding downwards, the converting unit of the corresponding position section of input terminal connection of each switching group of rounding downwards,
Maximum voltage value for exporting the bleeder circuit output smaller than being measured voltage in the converting unit of corresponding position section；
Data latches, input terminal step-by-step section are sequentially connected the digital signal of m converting unit output, are used for from high to low
The synchronism output of digital signal.
The first converting unit of highest order includes in the converting unit：First equal bleeder circuit, input terminal connect benchmark
Voltage Vref, it is used for reference voltage VrefIt is divided into 2n1Equal portions, wherein n1 are the obtained number letter of first converting unit
Number digit；First comparison circuit, input terminal connects the output end of the first equal bleeder circuit and measured voltage, for that will be tested
Amount voltage is compared with the output voltage of the first equal bleeder circuit respectively, is measured the same mutually defeated of each comparator of control source
Enter end, the inverting input of the corresponding comparator of output voltage input of the first equal voltage division circuit obtains pair according to comparison result
The low and high level answered；First decoder, input terminal connect the output end of comparison circuit, for compiling the output result of comparison circuit
N1 position digital signals are translated into, decode the ascending high level quantity exported with the first comparison circuit of numerical value of output from less to more
It is corresponding.
The second converting unit to the m-1 converting units of interposition include in the converting unit：Equal bleeder circuit, it is defeated
It is the benchmark that the equal bleeder circuit of upper level divides equally voltage value to enter to hold the output end for connecting the downward rounding switching group of upper level and size
Voltage (reference voltage is superimposed upon on the output voltage of the downward rounding switching group of upper level), for reference voltage to be divided into 2nsDeng
Part, wherein ns is the digit of the obtained digital signal of the converting unit, and s is the integer more than 1 and less than m；Superposition is equal
Bleeder circuit, input terminal connection are measured the reference voltage that voltage and size divide equally voltage value for the equal bleeder circuit of upper level, use
In reference voltage is divided into 2nsEqual portions, and be superimposed upon on measured voltage；Comparison circuit, input terminal connection upper level take upwards
The output end of whole switching group output end and this grade of equal bleeder circuit of superposition, upper level round up the output electricity of switching group output end
Pressure inputs the in-phase input end of each comparator, and the output voltage of this grade of equal bleeder circuit of superposition is input to the anti-of corresponding comparator
Phase input terminal obtains corresponding low and high level according to comparison result；Decoder, input terminal connect the output end of comparison circuit, use
In the output result of comparison circuit is compiled as ns position digital signals, the numerical value for decoding output ascending is exported with comparison circuit
High level quantity correspond to from less to more.
The m converting units of lowest order include in the converting unit：M is superimposed equal bleeder circuit, be measured voltage and
Size is the reference voltage that the equal bleeder circuit of upper level divides equally voltage value, for reference voltage to be divided into 2nmEqual portions, and be superimposed upon
Be measured voltage on, wherein nm for the obtained digital signal of m converting units digit；M comparison circuits, it is defeated
Enter that end connection m-1 rounds up the output end of switching group and m is superimposed the output end of equal bleeder circuit, m-1 rounds up
The in-phase input end m that the output voltage of the output end of switching group inputs each comparator is superimposed the output voltage of equal bleeder circuit
It is input to the inverting input of corresponding comparator, corresponding low and high level is obtained according to comparison result；M decoders, input terminal
The output end for connecting m comparison circuits, for the output result of m comparison circuits to be compiled as nm position digital signals, wherein nm
For the digit of the obtained digital signal of m converting units, the numerical value for decoding output is ascending with m comparison circuits
The high level quantity of output corresponds to from less to more.
The size of reference voltage in Fig. 1 is the scale value of upper level, and exactly equal bleeder circuit divides equally voltage value, by benchmark
Voltage source circuit provides, and each reference voltage is mutual indepedent.
The switching group that rounds up includes 2n1It switchs and one 2n1The logical unit of position；Described 2n1A switch
Input terminal connects the output end of equal bleeder circuit, and control terminal connects the output end of logical unit, output end Parallel opertation；Institute
The output end for stating the input terminal connection comparison circuit of logical unit, for control it is described switch on-off, make to round up
The output voltage of switching group is the minimum amount of voltage that of the equal bleeder circuit output bigger than measured voltage.
The switching group that rounds up includes 2nsIt is a to switch and one 2nsThe logical unit of position；Described 2nsA switch
Input terminal connect the output end of equal bleeder circuit, control terminal connects the output end of logical unit, output end Parallel opertation；
The input terminal of the logical unit connects the output end of equal bleeder circuit, for control it is described switch on-off, make upwards
The output voltage of rounding switching group is the minimum amount of voltage that of the equal bleeder circuit output bigger than measured voltage.
The downward rounding switching group includes 2n1It is a to switch and one 2n1The logical unit of position；Described 2n1A switch
Input terminal connect the output end of equal bleeder circuit, control terminal connects the output end of logical unit, output end Parallel opertation；
The input terminal connection comparison circuit of the logical unit or the output end of equal bleeder circuit, for controlling the logical of the switch
Disconnected, the output voltage for the switching group that makes to round up is the maximum voltage value that the equal bleeder circuit smaller than measured voltage exports.
The downward rounding switching group includes 2nsIt is a to switch and one 2nsThe logical unit of position, wherein s are more than 1
And the integer less than m-1；Described 2nsThe input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects logical operation
The output end of unit, output end Parallel opertation；The input terminal connection comparison circuit of the logical unit or equal bleeder circuit
Output end, for control it is described switch on-off, the output voltage for the switching group that makes to round up is smaller than measured voltage
The maximum voltage value of equal bleeder circuit output.
As shown in Fig. 2, in order to illustrate the technology contents of the present invention, the present invention provides one embodiment, is turned with 16 moduluses
Example is changed to be illustrated.
The binary number of the output of 16 analog-to-digital conversions can be expressed as a sequence：(D15 D14 D13 D12 D11
D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0), this sequence indicates 16 binary digits from a high position to low from left to right
Position.16 bit positions section is grouped.(D15 D14 D13 D12) is first section group, and (D11 D10 D9 D8) is
Second section group, (D7 D6 D5 D4) are third position section group, and (D3 D2 D1 D0) is the 4th section group.Each position section group is parallel
Conversion.U10 pairs of first section group of converting unit carries out Parallel transformation, and converting unit U20 carries out Parallel transformation to second section group,
Converting unit U30 carries out Parallel transformation to third position section group, and the 4th section group of U40 pairs of converting unit carries out Parallel transformation, data
Output unit U50 collect each converting unit as a result, output data.
In converting unit U10, the first equal bleeder circuit is constituted by resistor network R101-R116, normal voltage E101's
Voltage V on the basis of valueref, 16 equal portions are divided into, V can be exported successively from resistor network R101-R116ref/16、2Vref/16、
3Vref/16、4Vref/16、5Vref/16、6Vref/16、7Vref/16、8Vref/16、9Vref/16、10Vref/16、11Vref/16、
12Vref/16、13Vref/16、14Vref/16、15Vref/ 16 equal voltages.Input voltage (being labeled as u) passes through voltage comparator
A101-A115 is compared with the voltage of resistor network R101-R116 outputs successively.When the voltage specific resistance network converted
When the voltage of R101-R116 outputs is high, comparator just exports high level (being indicated with logic 1), when the voltage specific resistance converted
When the voltage of network R101-R116 outputs is low, comparator just exports low level (being indicated with logical zero), in this way, 15 voltages compare
Device just has 15 logic voltage outputs.This 15 logic voltage inputs decoder DECODER10, decoder DECODER10 outputs four
Bit binary number value (D15 D14 D13 D12).The truth table of decoder is as follows：
The truth table of 1 decoder of table
Since in converting unit U10, resistor network divides equally reference voltage, so converting unit U10 constitutes one four
Bit only gives up the analog-digital converter not entered.Converting unit U20 continues to convert to the part given up.
In converting unit U20, resistor network R221-R236 and comparator A201-A215 constitute partial pressure comparison circuit.Electricity
It hinders network R221-R236 and constitutes bleeder circuit, respectively normal voltage E202.E201 and E202 is that size is identical, but independently of one another
Reference voltage.Voltage V on the basis of the value of normal voltage E202ref/ 16, it is divided into 16 equal portions.The reference of normal voltage E202
Zero potential is the input voltage converted.Then the resistor network of converting unit U20 can export V successivelyref/256+u、2Vref/
256+u、3Vref/256+u、4Vref/256+u、5Vref/256+u、6Vref/256+u、7Vref/256+u、8Vref/256+u、9Vref/
256+u、10Vref/256+u、11Vref/256+u、12Vref/256+u、13Vref/256+u、14Vref/256+u、15Vref/256+u
Equal voltages.The resistor network R221-R236 output voltages of converting unit U20 are sequentially ingressed into the same of voltage comparator A201-A215
Phase input terminal；The voltage that the anti-phase input termination switching group S11 of voltage comparator A201-A215 is transmitted, size is to turn
Changing the big minimum amount of voltage that of input voltage u that the ratio of the resistor network R221-R236 output of unit U10 is converted, (i.e. S11's is defeated
Go out voltage).When the voltage for the voltage specific resistance network R221-R236 outputs converted is low, comparator just exports high level and (uses
Logic 1 indicates), when the voltage for the voltage specific resistance network R221-R236 outputs converted is high, comparator just exports low level
(being indicated with logical zero), in this way, 15 voltage comparators just have 15 logic voltage outputs, this 15 logic voltage to input decoder
DECODER20, decoder DECODER20 output tetrad number values (D11 D10 D9 D8).Decoder DECODER20
Truth table it is identical as decoder DECODER10 truth tables.
In converting unit U20, the circuit of respectively normal voltage E201 is made of resistor network R201-R216.Standard electric
Voltage V on the basis of the value of pressure E201ref/ 16, it is divided into 16 equal portions.The reference zero potential of normal voltage E201 is switching group S12
Output voltage.
In converting unit U30, the circuit of respectively normal voltage E302 is made of resistor network R321-R326.Standard electric
Voltage V on the basis of the value of pressure E302ref/ 256, it is divided into 16 equal portions.The reference zero potential of normal voltage E302 is converted
Input voltage u.Then the resistor network of converting unit U30 can export V successivelyref/4096+u、2Vref/4096+u、3Vref/4096
+u、4Vref/4096+u、5Vref/4096+u、6Vref/4096+u、7Vref/4096+u、8Vref/4096+u、9Vref/4096+u、
10Vref/4096+u、11Vref/4096+u、12Vref/4096+u、13Vref/4096+u、14Vref/4096+V10、15Vref/4096
The voltages such as+u.The resistor network R321-R326 output voltages of converting unit U30 are sequentially ingressed into voltage comparator A301-A315's
In-phase input end；The voltage that the anti-phase input termination switching group S21 of voltage comparator A301-A315 is transmitted, size are
Minimum amount of voltage that big input voltage u that the ratio of the resistor network R321-R326 output of converting unit U20 is converted.When being turned
When the voltage for the voltage specific resistance network R321-R326 outputs changed is low, comparator just exports high level (being indicated with logic 1), when
When the voltage for the voltage specific resistance network R321-R326 outputs converted is high, comparator just exports low level and (uses logical zero table
Show), in this way, 15 voltage comparators just have 15 logic voltage outputs, this 15 logic voltage to input decoder DECODER30,
Decoder DECODER30 output tetrad number values (D7 D6 D5 D4).The truth table of decoder DECODER30 with translate
Code device DECODER10 truth tables are identical.
In converting unit U30, the circuit of respectively normal voltage E301 is made of resistor network R301-R316.Standard electric
Voltage V on the basis of the value of pressure E301ref/ 256, it is divided into 16 equal portions.The reference zero potential of normal voltage E301 is switching group
The output voltage of S22.
In converting unit U40, the circuit of respectively normal voltage E401 is made of resistor network R401-R416.Standard electric
Voltage V on the basis of the value of pressure E401ref/ 4096, it is divided into 16 equal portions.The reference zero potential of normal voltage E401 is to be converted
Input voltage u.Then the resistor network R401-R416 of converting unit U40 can export V successivelyref/65536+u、2Vref/
65536+u、3Vref/65536+u、4Vref/65536+u、5Vref/65536+u、6Vref/65536+u、7Vref/65536+u、
8Vref/65536+u、9Vref/65536+u、10Vref/65536+u、11Vref/65536+u、12Vref/65536+u、13Vref/
65536+u、14Vref/65536+V10、15VrefThe voltages such as/65536+u.The resistor network R401-R416 of converting unit U40 is defeated
Go out the in-phase input end that voltage is sequentially ingressed into voltage comparator A401-A415；The inverting input of voltage comparator A401-A415
The voltage that switching group S301 is transmitted is connect, the ratio for the resistor network R401-R416 outputs that size is converting unit U30 is turned
Minimum amount of voltage that big the input voltage u that changes.When the voltage for the voltage specific resistance network R401-R416 outputs converted is low,
Comparator just exports high level (being indicated with logic 1), when the voltage for the voltage specific resistance network R401-R416 outputs converted is high
When, comparator just exports low level (being indicated with logical zero), in this way, 15 voltage comparators just have 15 logic voltage outputs, this
15 logic voltages input decoder DECODER40, decoder DECODER40 output tetrad number values (D3 D2 D1
D0).The truth table of decoder DECODER40 is identical as decoder DECODER10 truth tables.
As shown in figure 3, after converting unit U10, U20, U30, U40 conversion is stablized, converting unit U10, U20, U30,
The tetrad of each outputs of U40 is arranged from a high position to low level to get to the transformation result of needs successively.At above-mentioned 16
In analog-to-digital conversion, position section is divided into four positions section groups successively from high to low, and indeed according to needs, the digit of each position section can be with
Variation, minimum number of bits can be one, and maximum number of digits is limited by circuit scale realization.Position section group also not necessarily decile, Mei Gewei
The digit of section can be different.
In switching group, voltage is measured to the voltage at each resistance both ends in resistor voltage divider network and this converting unit and is carried out
Voltage compares, and forms logical value, by carrying out logical operation to logical value, controls the switch in switching group, makes to be more than this conversion
The minimum resistance net output voltage of the measured voltage of unit is transferred to the output end of switching group.
As shown in figure 4, for switching group S11, on logical value output line logical value C101-C115 with switch on-off it is true
It is as follows to be worth table (logical value 1 indicates that switch conduction, logical value 0 indicate switch OFF).Logic value sequence on logic output line is
(C115 C114 C113 C112 C111 C110 C109 C108 C107 C106 C105 C104 C103 C102 C101),
Switching logic sequence in switching group is (S115 S114 S113 S112 S111 S110 S109 S108 S107 S106
S105 S104 S103 S102 S101)。
Table 2 rounds up the switching logic of switching group S11
| Switching group S11 input logic values | Switching group S11 on off states |
| 000 0000 0000 0000 | 0000 0000 0000 0001 |
| 000 0000 0000 0001 | 0000 0000 0000 0010 |
| 000 0000 0000 0011 | 0000 0000 0000 0100 |
| 000 0000 0000 0111 | 0000 0000 0000 1000 |
| 000 0000 0000 1111 | 0000 0000 0001 0000 |
| 000 0000 0001 1111 | 0000 0000 0010 0000 |
| 000 0000 0011 1111 | 0000 0000 0100 0000 |
| 000 0000 0111 1111 | 0000 0000 1000 0000 |
| 000 0000 1111 1111 | 0000 0001 0000 0000 |
| 000 0001 1111 1111 | 0000 0010 0000 0000 |
| 000 0011 1111 1111 | 0000 0100 0000 0000 |
| 000 0111 1111 1111 | 0000 1000 0000 0000 |
| 000 1111 1111 1111 | 0001 0000 0000 0000 |
| 001 1111 1111 1111 | 0010 0000 0000 0000 |
| 011 1111 1111 1111 | 0100 0000 0000 0000 |
| 111 1111 1111 1111 | 1000 0000 0000 0000 |
The voltage output line B101-B116 of the resistor network of converting unit U10 is corresponding with the input terminal of switch S101-S116
Connection, exports after the output end parallel connection of switch S101-S116.Switching group S11 output voltages are than quilt in converting unit U10 in this way
Measure the big minimum amount of voltage that of voltage.
As shown in figure 5, for switching group S12, on logical value output line logical value C101-C115 with switch on-off it is true
It is as follows to be worth table (logical value 1 indicates that switch conduction, logical value 0 indicate switch OFF).Logic value sequence on logic output line is
(C115 C114 C113 C112 C111 C110 C109 C108 C107 C106 C105 C104 C103 C102 C101),
Switching logic sequence in switching group is (S135 S134 S133 S132 S131 S130 S129 S128 S127 S126
S125 S124 S123 S122 S121)。
The switching logic of 3 downward rounding switching group S12 of table
| Switching group S12 input logic values | Switching group S12 on off states |
| 000 0000 0000 0000 | 0000 0000 0000 0000 |
| 000 0000 0000 0001 | 0000 0000 0000 0001 |
| 000 0000 0000 0011 | 0000 0000 0000 0010 |
| 000 0000 0000 0111 | 0000 0000 0000 0100 |
| 000 0000 0000 1111 | 0000 0000 0000 1000 |
| 000 0000 0001 1111 | 0000 0000 0001 0000 |
| 000 0000 0011 1111 | 0000 0000 0010 0000 |
| 000 0000 0111 1111 | 0000 0000 0100 0000 |
| 000 0000 1111 1111 | 0000 0000 1000 0000 |
| 000 0001 1111 1111 | 0000 0001 0000 0000 |
| 000 0011 1111 1111 | 0000 0010 0000 0000 |
| 000 0111 1111 1111 | 0000 0100 0000 0000 |
| 000 1111 1111 1111 | 0000 1000 0000 0000 |
| 001 1111 1111 1111 | 0001 0000 0000 0000 |
| 011 1111 1111 1111 | 0010 0000 0000 0000 |
| 111 1111 1111 1111 | 0100 0000 0000 0000 |
The voltage output line B101-B116 of the resistor network of converting unit U10 is corresponding with the input terminal of switch S121-S136
Connection, exports after the output end parallel connection of switch S121-S136.Switching group S12 output voltages are than quilt in converting unit U10 in this way
Measure the small maximum voltage value of voltage.
As shown in fig. 6, for switching group S21, on logical value output line logical value C201-C215 with switch on-off it is true
It is as follows to be worth table (logical value 1 indicates that switch conduction, logical value 0 indicate switch OFF).Logic value sequence on logic output line is
(C215 C214 C213 C212 C211 C210 C209 C208 C207 C206 C205 C204 C203 C202 C201),
Switching logic sequence in switching group is (S215 S214 S213 S212 S211 S210 S209 S208 S207 S206
S205 S204 S203 S202 S201)。
Table 4 rounds up the switching logic of switching group S21
| Switching group S2 input logic values | It is not related to a group S2 on off states |
| 000 0000 0000 0000 | 0000 0000 0000 0001 |
| 100 0000 0000 0000 | 0000 0000 0000 0010 |
| 110 0000 0000 0000 | 0000 0000 0000 0100 |
| 111 0000 0000 0000 | 0000 0000 0000 1000 |
| 111 1000 0000 0000 | 0000 0000 0001 0000 |
| 111 1100 0000 0000 | 0000 0000 0010 0000 |
| 111 1110 0000 0000 | 0000 0000 0100 0000 |
| 111 1111 0000 0000 | 0000 0000 1000 0000 |
| 111 1111 1000 0000 | 0000 0001 0000 0000 |
| 111 1111 1100 0000 | 0000 0010 0000 0000 |
| 111 1111 1110 0000 | 0000 0100 0000 0000 |
| 111 1111 1111 0000 | 0000 1000 0000 0000 |
| 111 1111 1111 1000 | 0001 0000 0000 0000 |
| 111 1111 1111 1100 | 0010 0000 0000 0000 |
| 111 1111 1111 1110 | 0100 0000 0000 0000 |
| 111 1111 1111 1111 | 1000 0000 0000 0000 |
The voltage output line B201-B216 of the resistor network of converting unit U20 is corresponding with the input terminal of switch S201-S216
Connection, exports after the output end parallel connection of switch S201-S216.Switching group S21 output voltages are than quilt in converting unit U20 in this way
Measure the big minimum amount of voltage that of voltage.
As shown in fig. 7, for switching group S22, on logical value output line logical value C201-C215 with switch on-off it is true
It is as follows to be worth table (logical value 1 indicates that switch conduction, logical value 0 indicate switch OFF).Logic value sequence on logic output line is
(C215 C214 C213 C212 C211 C210 C209 C208 C207 C206 C205 C204 C203 C202 C201),
Switching logic sequence in switching group is (S235 S234 S233 S232 S231 S230 S229 S228 S227 S226
S225 S224 S223 S222 S221)。
The switching logic of 5 downward rounding switching group S22 of table
| Switching group S2 input logic values | Switching group S2 on off states |
| 000 0000 0000 0000 | 0000 0000 0000 0000 |
| 100 0000 0000 0000 | 0000 0000 0000 0001 |
| 110 0000 0000 0000 | 0000 0000 0000 0010 |
| 111 0000 0000 0000 | 0000 0000 0000 0100 |
| 111 1000 0000 0000 | 0000 0000 0000 1000 |
| 111 1100 0000 0000 | 0000 0000 0001 0000 |
| 111 1110 0000 0000 | 0000 0000 0010 0000 |
| 111 1111 0000 0000 | 0000 0000 0100 0000 |
| 111 1111 1000 0000 | 0000 0000 1000 0000 |
| 111 1111 1100 0000 | 0000 0001 0000 0000 |
| 111 1111 1110 0000 | 0000 0010 0000 0000 |
| 111 1111 1111 0000 | 0000 0100 0000 0000 |
| 111 1111 1111 1000 | 0000 1000 0000 0000 |
| 111 1111 1111 1100 | 0001 0000 0000 0000 |
| 111 1111 1111 1110 | 0010 0000 0000 0000 |
| 111 1111 1111 1111 | 0100 0000 0000 0000 |
The voltage output line B201-B216 of the resistor network of converting unit U20 is corresponding with the input terminal of switch S221-S236
Connection, exports after the output end parallel connection of switch S221-S236.Switching group S22 output voltages are than quilt in converting unit U20 in this way
Measure the small maximum voltage value of voltage.
The structure of switching group S31 is consistent with the structure of switching group S21.
The present invention carries out voltage conversion using cursor type, and carrying out analog-to-digital conversion to voltage can regard as using with a scale
Voltage scale measures voltage.As shown in figure 8, in converting unit U10, using coarse scale voltage scale to voltage into
Row measures, if the precision of voltage scale is Vref/16 (length of L3), the result to voltage measurement is to measure voltage ratio
NVref/16 is big, but smaller than (N+1) Vref/16 voltages, measures voltage and falls in voltage scale scale NVref/M and (N+1) Vref/
Between 16.NVref/16 may be considered the result of first time bigness scale amount.In order to improve the precision of measurement, need using scale more
Small voltage scale, so, it is that (length of L4 is equal to Vref/16 that voltage scale L4, length have been used in the second level measures
L3), divide equally voltage scale measurement of length voltage scale, precision Vref/256 using 15 scales.Due to voltage scale
L4 be superimposed upon on measured voltage.So upper level scale voltage calibration (N+1) Vref/16 is fallen voltage scale L4's
In meter full scale, the tops voltage scale L4 and upper level scale voltage calibration (N+1) Vref/16 distances and measured voltage u with
The distance of upper level scale voltage calibration (N+1) Vref/16 has equality, so, it can be by measuring the tops voltage scale L4
The distance with upper level scale voltage calibration (N+1) Vref/16 distances is held to obtain measured value.Voltage scale L4 is due to being superimposed upon
It is measured on voltage u, always voltage scale L4 floats with the variation of measured voltage u, but upper level Measurement scales quilt
It is measured the big minimum amount of voltage that of voltage u always to fall in the meter full scale of voltage scale L4, can be measured to.Later
Voltage measurement in, need the measurement result of front to be first overlapped, form the new object being indirectly measured.
Claims (8)
1. a kind of cursor type high-precision high-speed A/D conversion equipments, which is characterized in that including m converting unit, each converting unit
For the A/D conversions of one section of continuous digit, further include：
The m-1 switching groups that round up, the converting unit of the corresponding position section of input terminal connection for the switching group that each rounds up, are used for
Export the minimum amount of voltage that of the bleeder circuit output bigger than being measured voltage in the converting unit of corresponding position section；
The m-2 switching groups of rounding downwards, the converting unit of the corresponding position section of input terminal connection of each switching group of rounding downwards, are used for
Export the maximum voltage value of the bleeder circuit output smaller than being measured voltage in the converting unit of corresponding position section；
Data latches, input terminal step-by-step section are sequentially connected the digital signal of m converting unit output from high to low, for number
The synchronism output of signal.
2. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 1, which is characterized in that the conversion
The first converting unit of highest order includes in unit：
First equal bleeder circuit, input terminal connect reference voltage Vref, it is used for reference voltage VrefIt is divided into 2n1Equal portions, wherein n1 are
The digit of the obtained digital signal of first converting unit；
First comparison circuit, input terminal connect the output end of the first equal bleeder circuit and measured voltage, are used for measured electricity
Pressure is compared with the output voltage of the first equal bleeder circuit respectively, is measured the homophase input of each comparator of control source
End, the inverting input of the corresponding comparator of output voltage input of the first equal voltage division circuit, is corresponded to according to comparison result
Low and high level；
First decoder, input terminal connects the output end of comparison circuit, for the output result of comparison circuit to be compiled as n1
Digital signal, the ascending high level quantity exported with the first comparison circuit of numerical value for decoding output are corresponding from less to more.
3. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 1, which is characterized in that the conversion
The second converting unit to the m-1 converting units of interposition include in unit：
Equal bleeder circuit, the output end and size of the input terminal connection downward rounding switching group of upper level are downward to be superimposed upon upper level
The equal bleeder circuit of upper level on the output voltage of rounding switching group divides equally the reference voltage of voltage value, is used for reference voltage
It is divided into 2nsEqual portions, wherein ns are the digit of the obtained digital signal of the converting unit, and s is more than 1 and whole less than m
Number；
It is superimposed equal bleeder circuit, input terminal connection is measured the base that voltage and size divide equally voltage value for the equal bleeder circuit of upper level
Quasi- voltage, for reference voltage to be divided into 2nsEqual portions, and be superimposed upon on measured voltage；
Comparison circuit, input terminal connection upper level round up the output of switching group output end and this grade of equal bleeder circuit of superposition
End, the round up output voltage of switching group output end of upper level input the in-phase input end of each comparator, and the superposition of this grade is equal
The output voltage of bleeder circuit is input to the inverting input of corresponding comparator, and corresponding height electricity is obtained according to comparison result
It is flat；
Decoder, input terminal connects the output end of comparison circuit, for the output result of comparison circuit to be compiled as ns bit digitals
Signal, the ascending high level quantity exported with comparison circuit of numerical value for decoding output are corresponding from less to more.
4. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 1, which is characterized in that the conversion
The m converting units of lowest order include in unit：
M is superimposed equal bleeder circuit, is measured the reference voltage that voltage and size divide equally voltage value for the equal bleeder circuit of upper level,
For reference voltage to be divided into 2nmEqual portions, and be superimposed upon on measured voltage, wherein nm to be obtained for the m converting units
The digit of the digital signal arrived；
M comparison circuits, input terminal connection m-1 rounds up the output end of switching group and m is superimposed the defeated of equal bleeder circuit
Outlet, m-1 round up switching group output end output voltage input each comparator in-phase input end m superposition it is equal
The output voltage of bleeder circuit is input to the inverting input of corresponding comparator, and corresponding height electricity is obtained according to comparison result
It is flat；
M decoders, input terminal connects the output end of m comparison circuits, for the output result of m comparison circuits to be compiled as
Nm position digital signals, wherein nm for the obtained digital signal of m converting units digit, decode the numerical value of output by
It is small corresponding from less to more to the high level quantity exported with m comparison circuits greatly.
5. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 2, which is characterized in that described upward
Rounding switching group includes 2n1It switchs and one 2n1The logical unit of position；
Described 2n1The input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the output of logical unit
End, output end Parallel opertation；
The output end of the input terminal connection comparison circuit of the logical unit, for control it is described switch on-off, make to
The output voltage of upper rounding switching group is the minimum amount of voltage that of the equal bleeder circuit output bigger than measured voltage.
6. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 3, which is characterized in that described upward
Rounding switching group includes 2nsIt is a to switch and one 2nsThe logical unit of position；
Described 2nsThe input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the output of logical unit
End, output end Parallel opertation；
The input terminal of the logical unit connects the output end of equal bleeder circuit, for control it is described switch on-off, make
The output voltage for the switching group that rounds up is the minimum amount of voltage that of the equal bleeder circuit output bigger than measured voltage.
7. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 1, which is characterized in that described downward
Rounding switching group includes 2n1It is a to switch and one 2n1The logical unit of position；
Described 2n1The input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the output of logical unit
End, output end Parallel opertation；
The input terminal connection comparison circuit of the logical unit or the output end of equal bleeder circuit, for controlling the switch
Break-make, the output voltage for the switching group that makes to round up is the maximum voltage of the equal bleeder circuit output smaller than measured voltage
Value.
8. a kind of cursor type high-precision high-speed A/D conversion equipments according to claim 1, which is characterized in that described downward
Rounding switching group includes 2nsIt is a to switch and one 2nsThe logical unit of position, wherein s are the integer more than 1 and less than m-1；
Described 2nsThe input terminal of a switch connects the output end of equal bleeder circuit, and control terminal connects the output of logical unit
End, output end Parallel opertation；
The input terminal connection comparison circuit of the logical unit or the output end of equal bleeder circuit, for controlling the switch
Break-make, the output voltage for the switching group that makes to round up is the maximum voltage of the equal bleeder circuit output smaller than measured voltage
Value.
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| CN201810735097.9A CN108649954B (en) | 2018-07-05 | 2018-07-05 | Vernier type high-precision high-speed A/D conversion device |
| PCT/CN2019/082649 WO2020007092A1 (en) | 2018-07-05 | 2019-04-15 | Cursor-type high-accuracy and high-speed a/d conversion apparatus |
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Cited By (3)
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| CN110048719A (en) * | 2019-03-25 | 2019-07-23 | 湖州师范学院 | A kind of parallel comparison A/D C of segmentation |
| WO2020007092A1 (en) * | 2018-07-05 | 2020-01-09 | 成都信息工程大学 | Cursor-type high-accuracy and high-speed a/d conversion apparatus |
| WO2022241698A1 (en) * | 2021-05-19 | 2022-11-24 | 京东方科技集团股份有限公司 | Analog-to-digital conversion circuit, integrated chip, display device, and analog-to-digital conversion method |
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| CN1232321A (en) * | 1998-04-13 | 1999-10-20 | 中国科学院半导体研究所 | High speed and high-accuracy A/D converter |
| US20100001891A1 (en) * | 2008-07-01 | 2010-01-07 | Kabushiki Kaisha Toshiba | A/d converter |
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| CN208369562U (en) * | 2018-07-05 | 2019-01-11 | 成都信息工程大学 | A kind of cursor type high-precision high-speed A/D conversion equipment |
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| CN108649954B (en) * | 2018-07-05 | 2020-04-07 | 成都信息工程大学 | Vernier type high-precision high-speed A/D conversion device |
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| CN1166726A (en) * | 1997-01-17 | 1997-12-03 | 张葭 | New-type parallel A/D converter circuit |
| CN1232321A (en) * | 1998-04-13 | 1999-10-20 | 中国科学院半导体研究所 | High speed and high-accuracy A/D converter |
| US20100001891A1 (en) * | 2008-07-01 | 2010-01-07 | Kabushiki Kaisha Toshiba | A/d converter |
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| WO2020007092A1 (en) * | 2018-07-05 | 2020-01-09 | 成都信息工程大学 | Cursor-type high-accuracy and high-speed a/d conversion apparatus |
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| WO2022241698A1 (en) * | 2021-05-19 | 2022-11-24 | 京东方科技集团股份有限公司 | Analog-to-digital conversion circuit, integrated chip, display device, and analog-to-digital conversion method |
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