CN103414471B - Improve D/A converter integral nonlinearity and the method for differential nonlinearity measurement stability - Google Patents
Improve D/A converter integral nonlinearity and the method for differential nonlinearity measurement stability Download PDFInfo
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Abstract
The present invention relates to a kind of method improving D/A converter integral nonlinearity and differential nonlinearity measurement stability, including: 1) determine that the output of high-order equal weight current source cell to be measured is combined；2) according to the output combination determined, determine and measure the control signal and logic used；3) according to the control signal logic determined, high-order equal weight current supply switch decoding circuit structure amendment is completed；4) input data encoding and the control signal combination of measurement use are determined；5) measure according to the input data encoding determined and control signal combination, utilize measurement result reconstruct transmission function, calculate D/A converter integral nonlinearity and differential nonlinearity.The inventive method can reduce the output curent change scope during measurement and maximum value, weakens load temperature effect and current source influence of noise, improves and measures stability.The present invention is applied to the parameter measurement field of high-precision current-steering D/A converter integral nonlinearity and differential nonlinearity.
Description
Technical field
The present invention relates to a kind of raising D/A converter integral nonlinearity (DNL) and differential nonlinearity (INL) measures stability
Method, improve high accuracy segmented current-steering D/A converter integral nonlinearity particularly to one and differential nonlinearity measured stable
The method of degree.It directly applies to the parameter measurement field of high-precision current-steering D/A converter.
Background technology
In recent years, non-to integral nonlinearity and differential along with raising day by day and the rear end of high-precision current-steering D/A converter performance
Linearly (DNL/INL) parameter carries out the needs trimmed, and the measurement to DNL/INL parameter requires more and more higher.Turn to calculate
INL and DNL of parallel operation, needs directly or indirectly to go out the whole transmission function of D/A converter.Measure current steer D/A
During converter current output, generally convert electrical current into voltage and measure.
The measuring method of transmission function generally comprises directly to be measured and indirectly measures two kinds.
Directly metering system, for being sequentially output electric current by D/A converter input data encoding collection, directly measures transmission function,
The D/A converter of one n-bit, then have 2nPlant input data coding formal, 2 need to be carried out altogethernSecondary measurement, exports electric current
Persistently changing, excursion is full scale.When measuring high-precision current-steering D/A converter DNL/INL performance, this mode
Pendulous frequency many, require a great deal of time, it is impossible to meet actual application demand.
Indirect measure, only measures the output electric current of D/A converter input data encoding concentrated part input data encoding, profit
By measurement result, by calculating reconstruct transmission function, the indirect measurement method stream of conventional D/A converter DNL/INL parameter
Journey figure is as shown in Figure 1.By measuring the current value specified under input data encoding, calculate D/A converter senior middle school low level independent
The output numerical value of current source cell, by the output numerical value of senior middle school's low level individual current source units, compiles according to normal work input data
The lower current source cell switching sequence of code is linearly sued for peace, i.e. restructural transmission function.This approach reduces pendulous frequency to improve
Measurement efficiency, is widely used in D/A converter DNL/INL parameter measurement.But use the side of measurement indirectly
When formula measures high-precision current-steering D/A converter DNL/INL parameter, still there are the following problems: 1) by input data encoding
Limiting, during measurement, output curent change scope is close to full scale, causes load resistance power consumption unequal, and temperature effect is obvious,
The power consumption of output load resistance causes heating thus changes resistance value, the stability that the change impact of resistance value is measured；2) inputted
Data encoding limits, and during measurement, maximum output current absolute value is close to full scale, owing in D/A converter, current source heat outputting is made an uproar
Acoustoelectric currentElectric current I is exported with current sourceDThere is following proportionate relationship:Output electric current is the least, and noise is minimum, works as output
When electric current is bigger, measured deviation strengthens, and stability is measured in impact.The current steer D/A conversion of current 14 bits and above precision
Device, internal structure generally uses the segmentation implementation that thermometer coding is combined with binary coding, and high-order section is thermometer coding.
As a example by 16 bit 6-10 segmented current-steering D/A converters, use conventional indirect measure, measure output curent change model
Enclosing the 96.9% of about full scale, output electric current maximum value is about the 98.4% of full scale.
The most conventional high-precision current-steering D/A converter structure, is only controlled output size of current by input data encoding, the most logical
Cross the decoding output control individual current source units switch of input data encoding, individual current source units output combination under this structure
It is completely fixed, it is impossible to reduce excursion and the maximum value of indirect measure output electric current.
Accordingly, it would be desirable to existing conventional indirect measure is improved, simultaneously targetedly to high-precision current-steering D/A
Converter inside separate current source switch decoding circuit is modified, and reduces the excursion and exporting electric current during measuring
Big absolute value.
Summary of the invention
For overcoming above-mentioned conventional indirect measure stability when high-precision current-steering D/A converter DNL/INL parameter measurement
Inadequate problem, the present invention improves D/A converter integral nonlinearity and the method for differential nonlinearity measurement stability, by having
The control signal design of effect and the amendment of high-order equal weight current supply switch control structure, it is achieved measure the self-defining high-order power such as independent
Weight current source cell output combination, breaks through the restriction of D/A converter self input data encoding, reduces output electric current when measuring
Excursion and maximum value, reduce temperature effect and current source influence of noise, thus reach to improve D/A converter DNL/INL
The purpose of the stability measured.
For achieving the above object, the present invention a kind of improves D/A converter integral nonlinearity and differential nonlinearity measures stability
Method, is applied to n-bit current steer segmental structure D/A converter, and the segmental structure of this D/A converter is am-am-1-…-a1,
Amount to m section, wherein am+am-1+…+a1=n, m >=2, a high position for this D/A converter amounts to amBit, its internal employing temperature
Degree meter coded system decoding, controlsIndividual orthogonal independent switch, each independent switch controls an independent high position
Equal weight current source cell, in D/A converter, low bit architecture is am-1-am-2-…-a1Amount to n-amBit, its internal employing temperature
Degree meter coding or binary coding mode realization of decoding, the independence that in each, low level individual current source units is all controlled with one
Switch one_to_one corresponding, it is characterised in that improve described D/A converter integral nonlinearity and the side of differential nonlinearity measurement stability
Method comprises the following steps:
(1) high-order equal weight current source cell output combination to be measured is determined；
(2) according to equal weight current source cell output combination high-order described in step (1), determine and measure the control signal used；
(3) according to measuring the control signal of use described in step (2), amendment high-order equal weight current source cell switch decoding
Circuit structure；
(4) according to measuring the control signal of use described in step (2), determine and measure the input data encoding and control used
Signal coding combines；
(5) according to measuring input data encoding and the control signal coded combination of use described in step (4), measure,
Reconstruct transmission function, calculates integral nonlinearity and the differential nonlinearity of described D/A converter.
In described step (1), determine high-order equal weight current source to be measured according to the way of output that D/A converter uses
Unit output combination, the way of output has two kinds and is respectively difference output mode and Single-end output mode, and output combination comprises all
High-order equal weight current source cell information.
In described step (2), the output combination determined according to step (1), determine the effective control corresponding with output combination
Signal coding and control signal decoding logic, effective control signal coding and output combination one_to_one corresponding.
In described step (3), the control signal determined according to step (2), to high-order equal weight current supply switch decoding circuit
Structure is modified so that under control signal effect, turns on inductive switch, and high-order output electric current is the electricity determining output combination
Flow valuve, the high-order equal weight current source cell of work is the current source cell specified in output combination；To high-order equal weight current source
The structural modification of switch control rule decoding circuit, also includes adding to measure enabling signal, is measuring or under normal operation, point
Shi Neng control signal or high-order input data encoding.
In described step (4), the effective control signal coding and the D/A converter input data encoding that step (2) are determined enter
Row combination, makes to comprise all high positions of D/A converter and middle low level individual current source units information in measurement output signal, measures
Time, high-order individual current source units output current value is determined by control signal coding, low level individual current source units output in other
Current value is determined by low level input data encoding in correspondence.
In described step (5), the input data encoding and the control signal coded combination that determine according to step (4) measure,
According to measurement result, calculate that D/A converter is high-order and middle low level individual current source units numerical value, normal according to D/A converter
Current source cell switching sequence under work input data encoding, linearly sues for peace, reconstruct transmission function, calculates described D/A and turns
The integral nonlinearity of parallel operation and differential nonlinearity.
If position or low level in described D/A converter existence, also realized by equal weight current source cell, internal employing thermometer
Coded system decodes, and controls orthogonal independent switch, and each independent switch controls an independent equal weight current source list
Unit, in the most described step (1), (2), (3), the output combination that carries out for high-order equal weight current source cell, control signal
Design and the amendment mode carrying out high-order equal weight current source cell switch decoding circuit, be equally applicable to inside D/A converter
This kind of middle low level equal weight current source cell；The input data encoding determined in described step (4) is with control signal coded combination also
Modifying according to same design mode, control signal makes energy range be expanded as low level in a high position and correspondence by a high position.
Beneficial effect
The method improving D/A converter integral nonlinearity and differential nonlinearity measurement stability and the conventional D/A conversion of the present invention
Device parameter indirect measurement method is compared, and has the following characteristics that
Output curent change scope when 1, significantly reducing measurement.As a example by 16 bit 6-10 segmented current-steering D/A converters, if
Conventional indirect measure, the combination of measurable individual current source units is used to be limited by input data encoding, output electricity during measurement
Stream excursion is about the 96.9% of full scale, and according to this method, enters high-order independent equal weight current supply switch control structure
Row amendment, it is possible to measure self-defining high-order equal weight current source cell output combination, export curent change scope during measurement minimum
It is about the 0.8% of full scale, temperature effect impact when therefore can weaken measurement, improves the stability measured.
Output electric current maximum value when 2, significantly reducing measurement.As a example by 16 bit 6-10 segmented current-steering D/A converters,
According to conventional indirect measure, export electric current maximum value during measurement and be about the 98.4% of full scale, and according to this method,
Export electric current maximum value minimum during measurement and be about the 2.3% of full scale, current source influence of noise when therefore can weaken measurement,
Improve the stability measured.
3, the present invention proposes first equal weight individual current source units power control structure is modified, it is possible to measure and make by oneself
The D/A converter equal weight individual current source units output combination of justice, and in the indirect measure of routine, input can only be measured
The D/A converter equal weight individual current source units output combination that data encoding is corresponding.For 14 bits and above current steer thereof
Structure D/A converter, uses the inventive method, and the stability of its DNL/INL parameter measurement can improve 0.1LSB-1LSB,
Increase rate is the 10%-100% of D/A converter minimum resolution.
Accompanying drawing explanation
Fig. 1 is the indirect measurement method flow chart of conventional D/A converter DNL/INL parameter；
Fig. 2 is the method flow diagram that the present invention improves D/A converter DNL/INL parameter measurement stability；
Fig. 3 is the current supply switch control structure schematic diagram of a kind of high-order equal weight D/A converter of the embodiment of the present invention.
Fig. 4 is the current supply switch control structure schematic diagram of the another kind of high-order equal weight D/A converter of the embodiment of the present invention.
Detailed description of the invention
The detailed description of the invention of the present invention is not limited only to explained below, is further illustrated with in conjunction with accompanying drawing.
A kind of method improving D/A converter integral nonlinearity and differential nonlinearity measurement stability of the present invention, the n of its application
Bit current rudder segmental structure D/A converter, segmental structure is am-am-1-…-a1, am+am-1+…+a1=n, altogether m section；
Wherein a high position for D/A converter amounts to amBit, internal employing thermometer coding mode decodes, and controlsIndividual orthogonal
Independent switch, each independent switch control an independent high-order equal weight current source cell；Its flowchart such as Fig. 2
Shown in, key step includes:
1) way of output used according to D/A converter, self-defined determines that high-order equal weight current source cell to be measured is defeated
Go out combination；The way of output has two kinds and is respectively difference output mode and Single-end output mode.Under difference output mode, high-order etc.
Weight current source cell each output combination byArriveIndividual high-order equal weight current source cell composition；Arbitrarily
Export current absolute value deviation between two combinations and be about 2IMSB, IMSBFor high-order equal weight current source cell reference current,
Under all output combined situation, the output curent change scope of measurement is less than or equal to 2IMSB, measure the maximum exhausted of output electric current
To value less than or equal to IMSB.Under Single-end output mode, each output combination of high-order equal weight current source cell is often
One high position independent equal weight current source cell itself, during measurement, electric current is identical is I in all combination outputsMSB, all output groups
In the case of conjunction, the output curent change scope of measurement is 0, measures the maximum of output electric current less than or equal to IMSB.Two kinds
Under the way of output, determine the output combined number of measurement at leastIndividual, comprise all high-order equal weight current source cell letters
Breath.
2) control signal and the decoding logic of measurement use are determined.Control signal bit number is at least am, according to the output determined
Combined number determines control signal efficient coding number, each corresponding unique control signal efficient coding of output combination,
According to step 1) determine that the high-order equal weight current source cell of measurement exports Combination Design control signal decoding logic, defeated during measurement
Entering control signal, high-order equal weight current switch, according to decoding logic action, measures the current value of corresponding output combination.
3) according to the control signal decoding logic of design, high-order equal weight current source cell switch control rule decoding circuit structure is carried out
Amendment so that under control signal effect, the corresponding high-order equal weight current source cell switch of conducting, high-order output electric current is for making by oneself
The current value of justice output combination, the high-order equal weight current source cell of work is the current source cell specified in output combination.To height
Position equal weight current supply switch control decoding circuit structural modification also include add measure enable signal, this signal measure or
Under normal operation, enable control signal or high-order input data encoding respectively.Under measuring state, measuring enable signal is
High level, shielding high position input data encoding, control signal control the output of high side current source unit；Under normal operating conditions,
Measuring and enabling signal is low level, shields control signal, D/A converter high position input data encoding control high side current source single
Unit's output.
4) determine input data encoding and the control signal coded combination of measurement use, make that measurement output signal comprises D/A and turn
The all high positions of parallel operation and middle low level individual current source units information, during measurement, high-order individual current source units output current value by
Control signal determines, middle low level individual current source units output current value is determined by low level input data encoding in correspondence.In measurement
During low level individual current source units, a high position for the input data encoding of selection is 0, and middle low level is independent for comprising low level in difference
The brevity code value of current source cell, the control signal of selection is encoded to effective control signal coding that any one is fixing.Measure height
During the equal weight individual current source units of position, the input data encoding of selection is 0, and the control signal of selection is encoded to all designs
Effective control signal coding.
5) according to step 4) in the input data encoding that determines and control signal coded combination measure, by measurement result, meter
Calculating that D/A converter is high-order and middle low level individual current source units numerical value, normally work input data encoding according to D/A converter
Lower individual current source units switching sequence, linearly sues for peace, and reconstruct transmission function, the integration calculating described D/A converter is non-
Linear and differential nonlinearity.
Especially, if position or low level also realize for thermometer coding in D/A converter existence, such as middle position am-1Bit, interior
Portion is also adopted by thermometer coding mode and decodes, and controlsIndividual orthogonal independent switch, each independent switch controls one
Individual independent equal weight current source cell；Then step (1), (2), in (3) for high-order equal weight current source cell carry out defeated
Go out to combine self-defined, control signal design and the amendment mode that high-order equal weight current source cell switch decoding circuit is carried out,
It is equally applicable to equal weight current source cell in position in this, can be added in the implementation, add the output of position in rear high-lying and correspondence
Electric current, is determined by control signal during measurement；In step (4), input data encoding and the design of control signal coded combination are also carried out
Corresponding amendment, during measurement, high-order and middle position individual current source units output current value is determined by control signal, and remaining low level is independent
Current source cell output current value is determined by corresponding low level input data encoding.
As a example by 16 bit 6-10 segmented current-steering D/A converters, illustrate that the present invention implements step.D/A converter is defeated
Going out electric current to be converted to voltage (I/V conversion) and measure, measurement result is magnitude of voltage and output electric current linearly corresponding relation, should
A D/A converter high position is 6 bits, and internal employing thermometer coding mode decodes, and controls 63 orthogonal independent switches,
Each independent switch controls a corresponding high-order equal weight current source cell, high-order altogether by 63 independent equal weight current sources
Unit is constituted；Low level 10 bit uses binary coding mode to realize, and it is single that every 1 bit controls a corresponding binary current source
Unit's independent switch, low level is made up of 10 independent binary current source units altogether, and current source cell output size of current subtracts successively
Half.
Embodiment 1:
When D/A converter uses Single-end output mode, the Single-end output of measurement is the individual current source units electric current sum of conducting
Carry out the magnitude of voltage after I/V conversion.Measure voltage linear with output electric current.
Implement step as follows:
1. a high position independent equal weight current source cell output that design is to be measured is combined as each independent high-order equal weight current source
Unit itself, 63 altogether, the output electric current of each combination is a high-order equal weight current source cell benchmark IMSB。
2. use the high-order equal weight current source cell output combination that 6 control signal realization of decoding gatings are to be measured, effectively control
Coding changes to 0x3F from 0x01,63 kinds altogether, and its decoding logic is the high-order equal weight current source cell of gating reference numeral
Switch, remaining high-order equal weight current source cell switch is turned off；Such as 0x01 gates the 1st high-order equal weight current source cell
Switch, remaining 62 high-order equal weight current source cell switch closedowns, 0x02 gates the 2nd high-order equal weight current source cell
Switch, remaining 62 high-order equal weight current source cell switches cut out, by that analogy.
3., according to the control signal decoding logic of design, high-order equal weight current supply switch control structure is modified, after improvement
Structure is as it is shown on figure 3, [a in Fig. 315 a14 … a11 a10] it is corresponding high-order input coded data signal, [b5 b4 … b1 b0] it is
Control signal, S enables signal for measuring.As S=1, by control signal [b5 b4 … b1 b0] decoding output, control the power such as high-order
Weight current source cell switch, high-order input data encoding [a15 a14 … a11 a10] shielded, [b5 b4 … b1 b0] decoding output logic be
The control signal logic of design in step 2.As S=0, a high position input data encoding [a15 a14 … a11 a10] press thermometer volume
Code mode decodes output, controls high-order equal weight current source cell switch, now performs D/A converter and normally works input data
Coded logical operations, control signal [b5 b4 … b1 b0] shielded.
4. the control signal determined coding is combined with D/A converter input data encoding, in order to make measurement output signal
In comprise all high positions of D/A converter and low level individual current source units information, this combination is as shown in table 1.Table 1 comprise defeated
Entering data encoding and control signal encodes two parts, S=1 during measurement, high-order equal weight current source cell switches on-off only by controlling
Signal deciding processed, and unrelated with corresponding high-order input data encoding, and low level individual current source units switches on-off still by correspondence
Low level input data encoding determine.In table 1, the 1-10 time measure output electric current be respectively low level input data encoding corresponding
Output when low level binary current source unit and first high-order equal weight current source cell simultaneously turn on.Measure for the 11-73 time
Output electric current is respectively output during 63 reference numeral high position equal weight current source cell conductings.
5. measure according to input data encoding and control signal combination, utilize the 1-10 time measurement result to deduct the 11st survey
Amount is as a result, it is possible to obtain the current value information of 10 low level binaryweight ladder unit.Utilize the 11-73 time measurement result,
The current value information of 63 high-order equal weight current source cells can be obtained.By the high-order equal weight current source cell measured and low level
Binaryweight ladder cell current value, is carried out according to individual current source units switching sequence under normal work input data encoding
Linear summation, can complete the reconstruct of D/A converter transfer function, then calculate D/A converter DNL/INL parameter.
In the present embodiment, in measurement, maximum output current is 1.5IMSB, about the 2.3% of full scale, indirectly measure much smaller than conventional
63I it is about under modeMSB, about the 98.4% of full scale；Output curent change scope is about 0.499IMSB, about full scale
0.8%, it is about 62I much smaller than under conventional indirect measureMSB, about the 96.9% of full scale.
Table 1 measures the input data encoding used and control signal coding
Embodiment 2:
When D/A converter uses difference output mode, electric current has P end, and N end two-way exports, and P end output electric current is conducting
Individual current source units electric current sum, N end output electric current be Full-span output electric current deduct P end output electric current, the difference of measurement
Point be output as the magnitude of voltage after P end output electric current carries out I/V conversion and N end output electric current carry out the magnitude of voltage after I/V conversion it
Difference, has positive and negative both direction.Measure voltage linear with output electric current, it is achieved step describes defeated with current absolute value
Go out curent change scope and maximum.
Implement step:
1, as shown in table 2,65 groups export combination altogether in a high position independent equal weight current source cell output combination that design is to be measured,
Being represented to sequence number 65 by sequence number 1, the differential output current order of magnitude of each combination is about | 2IMSB| or 0, each is defeated
Go out combination corresponding current source numbering.In table 2, current source numbering refers to the high-order equal weight current source comprised in output combination
Element number, such as current source numbering 1-31 refer to that this output is combined as the 1 to 31st high-order equal weight current source cell and leads simultaneously
Logical output；Current source numbering 1-31,32 refer to that this output is combined as the 1 to 31st and the 32nd high-order equal weight current source list
Unit simultaneously turns on output, by that analogy.
Table 2 high-order equal weight current source cell output combination and corresponding control signal coding
2, use the high-order equal weight current source cell output combination that 7 control signal realization of decoding gatings are to be measured, effectively control
Signal coding changes to 0x40 from 0x00,65 kinds altogether, and switch number and corresponding control signal coding as shown in table 2, control
Signal interpretation logic is the high-order equal weight current source cell switch of the corresponding switch number of gating, remaining high-order equal weight current source list
Unit's switch is turned off；Such as control signal 0x00, corresponding switch number 1-31, when referring to input control signal 0x00, after decoding
Turn on No. 1-31 high-order equal weight current supply switch；Control signal 0x01, corresponding switch number 1-31,32, refer to input control
During signal 0x01 processed, after decoding, turn on No. 1-31 and No. 32 high-order equal weight current supply switch；Remaining situation is by that analogy.
3, according to the control signal decoding logic of design, high-order equal weight current supply switch control structure is modified, after improvement
Structure as shown in Figure 4, [a in Fig. 415 a14 … a11 a10] it is corresponding high-order input coded data signal, [b6 b5 b4 … b1 b0]
For control signal, S enables signal for measuring.As S=1, by control signal [b6 b5 b4 … b1 b0] decoding output, control a high position
Equal weight current source cell switchs, high-order input data encoding [a15 a14 … a11 a10] shielded, [b6 b5 b4 … b1 b0] decoding output
Logic is the control signal logic of design in step 2.As S=0, a high position input data encoding [a15 a14 … a11 a10] by temperature
Degree meter coded system decoding output, controls high-order equal weight current source cell switch, now performs D/A converter and normally work defeated
Enter data encoding logical operation, control signal [b6 b5 b4 … b1 b0] shielded.
4, the control signal determined is combined with D/A converter input data encoding, in order to make measurement output signal is wrapped
Containing all high positions of D/A converter and low level individual current source units information, this combination is as shown in table 3, comprises input number in table 3
Encoding two parts according to coding and control signal, S=1 during measurement, high-order equal weight current source cell switches on-off only to be believed by control
Number determining, and unrelated with corresponding high-order input data encoding, low level individual current source units switches on-off still low by correspondence
Position input data encoding determines.In table 3, measure output electric current for the 1-10 time and be respectively the low level that low level input data encoding is corresponding
Output when binary current source unit and the 1-31 high-order equal weight current source cell simultaneously turn on.The 11-75 time measurement is defeated
Going out electric current is the output combination current that control signal coding is corresponding, as shown in table 2, and such as the 11st time measuring control signal coding
For 0x00, the corresponding output measured when No. 1-31 high-order equal weight current source cell simultaneously turns on, measure for the 12nd time and control letter
Number it is encoded to 0x01, corresponding measures No. 1-31 and output time No. 32 high-order equal weight current source cell simultaneously turns on, the
13 measuring control signals are encoded to 0x02, and corresponding measurement the 1-31st and No. 33 high-order equal weight current source cell are led simultaneously
Output time logical, by that analogy.
Table 3 measures the input data encoding used and control signal coding
5, input data encoding and control signal coded combination according to determining measure, and utilize the 1-10 time measurement result to subtract
Go the 12nd measurement result, the current value information of 10 low level binaryweight ladder unit can be obtained.Utilize 12-43
Secondary measurement result deducts the 11st measurement result, respectively obtains the current value information of No. 32-63 high-order equal weight current source cell.
Utilize the 45-74 time measurement result to deduct the 44th measurement result, respectively obtain No. 1-31 high-order equal weight current source cell
Current value information.By the high-order equal weight current source cell measured and low level binaryweight ladder cell current value information,
Linearly sue for peace according to individual current source units switching sequence under normal work input data encoding, D/A converter can be completed
The reconstruct of transfer function, then calculates D/A converter DNL/INL parameter.
In the present embodiment, in measurement, maximum output current is | 2IMSB|, about the 3.1% of full scale, indirectly measure much smaller than conventional
It is about under mode | 62IMSB|, about the 96.9% of full scale；Exporting current absolute value excursion is | 2IMSB|, about full scale
3.1%, be about much smaller than under conventional indirect measure | 62IMSB|, about the 96.9% of full scale.
Claims (6)
1. improve D/A converter integral nonlinearity and a method for differential nonlinearity measurement stability, be applied to n-bit current steer
Segmental structure D/A converter, it is characterised in that in measurement mode, uses specific coding signal to control high-order equal weight electric current
Source unit switchs, and measures the output information of specific currents source unit combination, and then calculate the integral nonlinearity of D/A converter and micro-
Divide non-linear；
The method improving described D/A converter integral nonlinearity and differential nonlinearity measurement stability comprises the following steps:
(1) design is in measurement mode, specific high-order equal weight current source cell combination to be measured；
(2) according to the specific high-order equal weight current source cell combination described in step (1), needed for this combination is measured in design
Specific coding signal and decoding logic；
(3) according to the specific coding signal described in step (2) and decoding logic, it is achieved corresponding high-order equal weight electricity
Stream source unit switch decoding circuit；
(4) normally work the input data encoding used according to specific coding signal described in step (2) and D/A converter,
The particular measurement input signal collectively constituted with specific coding signal by input data encoding that design uses in measurement mode；
(5) in measurement mode, particular measurement input signal described in input step (4), measure successively, according to survey
Amount result, calculates integral nonlinearity and the differential nonlinearity of described D/A converter.
The method that raising D/A converter integral nonlinearity the most according to claim 1 and differential nonlinearity measure stability,
It is characterized in that, in described step (1), the way of output used according to D/A converter designs the power such as a high position to be measured
Weight current source cell output combination, the way of output has two kinds and is respectively difference output mode and Single-end output mode, output combination
Comprise all high-order equal weight current source cell information.
The method that raising D/A converter integral nonlinearity the most according to claim 1 and differential nonlinearity measure stability,
It is characterized in that, in described step (1), design is in measurement mode, specific high-order equal weight current source cell combination to be measured,
Follow following principle, by measuring the output of all combinations, it is possible to the reality calculating all high-order equal weight current source cells is defeated
Go out current information；The specific coding signal designed in described step (2) and the combination one of decoding logic design middle with step (1)
One is corresponding.
The method that raising D/A converter integral nonlinearity the most according to claim 1 and differential nonlinearity measure stability,
It is characterized in that, the particular measurement input signal that in described step (4), design uses in measurement mode, it then follows following principle,
1), during input particular measurement input signal, high-order equal weight current source cell is by particular measurement input signal described in step (4)
In specific coding signal section control, in, low level current source cell is by particular measurement input signal described in step (4)
Input data encoding portion controls；2) by measure all particular measurement input signals output, it is possible to calculate all height,
In, the actual output current information of low level current source cell.
The method that raising D/A converter integral nonlinearity the most according to claim 1 and differential nonlinearity measure stability,
It is characterized in that, D/A converter also needs to additionally add control signal, for realizing measurement pattern and normal mode of operation
Switching, under measurement pattern, high-order equal weight current source cell switch is controlled by specific coding signal, high-order under normal mode of operation
Equal weight current source cell switch is controlled by input coded data signal.
The method that raising D/A converter integral nonlinearity the most according to claim 1 and differential nonlinearity measure stability,
It is characterized in that, if the middle position of described D/A converter or low level, also realized by equal weight current source cell, the most described step
(1), (2), in (3), in measurement mode, for the high-order equal weight to be measured of high-order equal weight current source cell design
The reality of the current source cell switch decoding circuit structure of the combination of specific currents source unit, specific coding signal and decoding logic and correspondence
Existing method, is equally applicable to position or low level equal weight current source cell in D/A converter；In this case, described step (4)
In the particular measurement input signal that uses in measurement mode be also carried out amendment, the specific specific coding in particular measurement input signal
Signal control range is expanded as high-order equal weight current source cell and the middle position equal weight of correspondence by high-order equal weight current source cell
Current source cell or low level equal weight current source cell, and the input data encoding in particular measurement input signal controls remainder
Divide current source cell.
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