CN100514863C - Integrated digital calibration circuit and digital to analog converter (DAC) - Google Patents
Integrated digital calibration circuit and digital to analog converter (DAC) Download PDFInfo
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- CN100514863C CN100514863C CNB03825221XA CN03825221A CN100514863C CN 100514863 C CN100514863 C CN 100514863C CN B03825221X A CNB03825221X A CN B03825221XA CN 03825221 A CN03825221 A CN 03825221A CN 100514863 C CN100514863 C CN 100514863C
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Abstract
An integrated digital calibration circuit and digital to analog converter includes a digital to analog converter (DAC) and a digital calibration circuit including a memory for storing predetermined end point coefficients of the digital to analog converter transfer function; and an arithmetic logic unit for applying the end point coefficients to the DAC input signal to adjust the end points of the DAC and/or analog signal chain.
Description
Technical field
The present invention relates to a kind of integrated digital calibration circuit and digital to analog converter (DAC) that is used for regulating, revise, adjusting or proofread and correct the end points of DAC transfer function (transfer function).
Background technology
All need as a rule to adjust and control DAC end points, as zero graduation (zeroscale), full scale (full scale) or gain and skew.One of them prior application is an end point error correction.That is the correction of zero graduation and full-scale error and gain and offset error.
The transfer function end point errors of digital to analog converter (DAC) as zero graduation, full-scale error, skew and gain error, is exactly the problem of influence (DAC) accuracy all the time.The effort that reduced this error in the past comprises laser trimming, and it only is used for resistance and special hardware and the wafer fabrication of needs, and has significantly increased cost.Mixed signal (analog/digital) calibration is another kind of method, but its result is risky, and performance is limited and unreliable.It has also increased cost.Method in common is the design at optimal nominal desired result.But the precision of expection is high more, and cost is high more: need more high-precision design and production, increased software and/or circuit and more expensive manufacturing technology.In addition, compensate this error in the system that comprises DAC, and their previous reference path adds analog circuit chain (being analogue signal circuit) subsequently, at extra and more accurate integrated circuit connection, perhaps be integrated in the calibration system process aspect in the systems soft ware, need higher complexity and expense.
Summary of the invention
Therefore, an object of the present invention is, provide a kind of improved integrated programmable digital calibration circuit and digital to analog converter (DAC) to regulate the DAC transfer function end point.
Another object of the present invention is, a kind of improved integrated programmable digital calibration circuit and digital to analog converter (DAC) are provided, and it provides accuracy and performance under the situation that keeps low cost and complexity.
Another object of the present invention is, a kind of improved integrated programmable digital calibration circuit is provided, and it uses digital low cost method.
Another object of the present invention is, a kind of improved integrated programmable digital calibration circuit is provided, it not only can regulate among the DAC and also can regulate end points in the associated analog.
Another object of the present invention is, a kind of improved integrated programmable digital calibration circuit is provided, and it has reduced external control circuit, as the requirement of microcontroller, DSP and CPU.
Another object of the present invention is, a kind of improved integrated programmable digital calibration circuit is provided, and it can regulate zero graduation and full scale and gain and skew.
Another object of the present invention is to provide a kind of improved integrated digital calibration circuit and digital to analog converter (DAC), with compensation DAC transfer function end point errors.
Another object of the present invention is, a kind of improved integrated digital calibration circuit and digital to analog converter (DAC) are provided, and it is keeping providing higher accuracy and performance under low-cost and the complexity situation.
Another object of the present invention is, a kind of improved integrated digital calibration circuit is provided, and it uses digital cost effective method.
Another object of the present invention is, a kind of improved integrated digital calibration circuit is provided, it not only can reduce among the DAC and also can reduce error in the associated analog.
Another object of the present invention is, a kind of improved integrated digital calibration circuit is provided, and it has reduced external control circuit, as the requirement of microcontroller, DSP and CPU.
Another object of the present invention is, a kind of improved integrated digital calibration circuit is provided, and it can correct zero scale and full-scale error and gain and offset error.
Result of the present invention comes from, by with alignment unit and the integrated DAC that realizes of DAC, so that DAC transfer function end point coefficient to be provided to the DAC numeral, as gain and offset coefficient, zero graduation and full scale coefficients, these coefficients can be outside or internally be stored in calibration circuit or have held on the chip of calibration circuit and DAC, and can be used to regulate the end points of DAC end points or DAC end points and the analog circuit relevant with DAC, and, memory can be made into the user and can read, with error correction programming after the manufacturing that is used for DAC and/or associated analog.
The invention is characterized in a kind of integrated digital calibration circuit able to programme and digital to analog converter, comprise a digital to analog converter (DAC) and a digital calibration circuit, comprise that the memory of a predetermined end point coefficient that is used to store the digital to analog converter transfer function and one are used for these end point coefficients are applied to the DAC input signal to regulate the ALU of DAC end points.
In a preferred embodiment, end point coefficients can comprise offset coefficient and gain coefficient.ALU can comprise that one has and is used for the mlultiplying circuit that DAC input and gain coefficient are multiplied each other and is used for computing circuit with the add circuit of offset coefficient and input signal addition.End point coefficients can comprise zero graduation and full scale coefficients.ALU can comprise a computing circuit, be used for algebraically and use zero graduation output and desirable output, and least significant bit (LSB) is worth and their is standardized to obtain the zero graduation coefficient relatively, and output of merging full scale and desirable output, and with respect to LSB with their normalization obtaining full scale coefficients, and these coefficients are applied to the input signal of DAC.Digital calibration circuit and DAC can be on same integrated circuit (IC) chip.Memory can be in digital correction circuit.Memory can be in the outside of digital correction circuit.But memory can be user's access programmable storage.
Feature of the present invention also is a kind of programmable digital calibration system, comprises an integrated digital calibration circuit and digital to analog converter, comprises the analogue signal circuit of a digital to analog converter (DAC) and this DAC of response.Digital calibration circuit comprises a memory that is used to store the predetermined end point coefficient of digital to analog converter transfer function, and comprises that one is used for these end point coefficients are applied to the ALU of DAC input signal with the end point coefficients of compensation DAC and analogue signal circuit.
In a preferred embodiment, digital calibration circuit and DAC can be on same integrated circuit (IC) chip.Memory can be in digital calibration circuit, or in the digital calibration circuit outside.
But memory can be a kind of user's access programmable storage.
Feature of the present invention also is a kind of integrated digital calibration circuit able to programme and digital to analog converter, comprise a digital to analog converter and a digital calibration circuit, this circuit comprises that one is used to store the predetermined migration coefficient of digital to analog converter (DAC) and the memory of gain coefficient, with an ALU, this ALU comprises that has a mlultiplying circuit that is used for DAC imports and gain coefficient multiplies each other, with the computing circuit that is used for offset coefficient is added to the add circuit of input signal, to regulate gain and the offset error of DAC.
In a preferred embodiment, digital calibration circuit and DAC can be on same integrated circuit (IC) chip.Memory can be in digital calibration circuit, or in the digital calibration circuit outside.But memory can be user's access programmable storage.
Feature of the present invention also is a kind of programmable digital calibration system, comprises an integrated digital calibration circuit and digital to analog converter, comprises the analogue signal circuit of a digital to analog converter (DAC) and this DAC of response.Digital calibration circuit comprises that one is used to store the predetermined migration coefficient of digital to analog converter (DAC) and the memory of gain coefficient, and comprise an ALU, this ALU comprises that has a mlultiplying circuit that is used for DAC imports and gain coefficient multiplies each other, with the computing circuit that is used for offset coefficient is added to the add circuit of input signal, to regulate the gain and the skew of DAC and analogue signal circuit.
In a preferred embodiment, digital calibration circuit and DAC can be on same integrated circuit (IC) chip.Memory can be in digital calibration circuit, or in the digital calibration circuit outside.But memory can be user's access programmable storage.
Feature of the present invention also is a kind of integrated programmable digital calibration circuit and digital to analog converter, comprise a digital to analog converter (DAC) and a digital calibration circuit, this circuit comprises that one is used to store the predetermined zero graduation of digital to analog converter DAC and the memory of full scale coefficients, with an ALU, this ALU comprises a computing circuit, be used for algebraically and merge zero graduation output and desirable output, and pass through least significant bit (LSB) value their are standardized to obtain the zero graduation coefficient, and output of merging full scale and desirable output, and by LSB with their normalization to obtain full scale coefficients, and these coefficients are applied to the input signal of DAC, with the zero graduation and the full scale of regulating described DAC.
In a preferred embodiment, digital calibration circuit and DAC are on same integrated circuit (IC) chip.Memory can be in digital calibration circuit, also can be outside this circuit, but and this memory can be user's access programmable storage.
Feature of the present invention also is a kind of programmable digital calibration system, and this system comprises an integrated digital calibration circuit and digital to analog converter, comprises the analogue signal circuit of a digital to analog converter (DAC) and this DAC of response.Digital calibration circuit comprises that one is used to store the predetermined zero graduation of this DAC and analogue signal circuit and memory and ALU of full scale coefficients, this unit comprises a computing circuit, be used for that algebraically merges zero graduation output and desirable output and by least significant bit (LSB) value to its normalization with acquisition zero graduation coefficient, and merge full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these coefficients are applied to zero graduation and the full scale skew of input signal of DAC to regulate DAC and analogue signal circuit.
In a preferred embodiment, this digital calibration circuit and DAC are positioned on the same integrated circuit (IC) chip.Memory can be arranged in this digital calibration circuit or outside, but and this memory can be user's access programmable storage.
Feature of the present invention also is a kind of integrated digital calibration circuit and digital to analog converter, comprise a digital to analog converter (DAC) and a digital calibration circuit, this calibration circuit comprises memory and ALU of the predetermined complement (complement) of an end point error that is used to store the digital to analog converter transfer function, and this ALU is used for the complement of end point error is applied to the DAC input signal to compensate the end point error of this DAC.
In a preferred embodiment, the complement of this end point error can comprise offset error and gain error.This ALU can comprise a computing circuit, and this computing circuit has and is used for the mlultiplying circuit of the input of DAC and gain error multiplication and offset error coefficient added to the add circuit of input signal.The complement of end point error can comprise zero graduation and full-scale error coefficient.This ALU can comprise a computing circuit, be used for algebraically count of zero scale output and desirable output and by least significant bit (LSB) value to its normalization with acquisition zero graduation error, and merge full scale output and desirable output and by LSB value to its normalization with acquisition full-scale error coefficient, and these coefficients are applied to the input signal of DAC.This digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can be in digital calibration circuit.This memory can be positioned at outside the digital calibration circuit.But this memory can be user's access programmable storage.
Feature of the present invention also is a kind of digital calibration system, comprises an integrated digital calibration circuit and digital to analog converter, comprises a digital to analog converter (DAC) and the analogue signal circuit in response to this DAC.Digital calibration circuit comprises the memory of the predetermined complement of the end point error that is used to store the digital to analog converter transfer function, and comprise that an ALU, this ALU are used for the complement of end point error is applied to the end point error of the input signal of this DAC with compensation DAC and analogue signal circuit.
In a preferred embodiment, this digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can among the digital calibration circuit or outside.But this memory can be user's access programmable storage.
Feature of the present invention also is a kind of integrated digital calibration circuit and digital to analog converter, comprise a digital to analog converter and a digital calibration circuit, this digital calibration circuit comprises that one is used to store the predetermined migration error coefficient of digital to analog converter (DAC) and memory and ALU of gain error coefficient, this ALU comprises a computing circuit, this computing circuit has one and is used for the mlultiplying circuit of the input of DAC and gain error multiplication and one are added to the add circuit of input signal with offset error coefficient, with gain and the offset error of compensation DAC.
In a preferred embodiment, this digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can among the digital calibration circuit or outside.But this memory can be user's access programmable storage.
Feature of the present invention also is a kind of digital calibration system, comprises an integrated digital calibration circuit and digital to analog converter, comprises a digital to analog converter (DAC) and the analogue signal circuit in response to this DAC.Digital calibration circuit comprises that one is used to store the predetermined migration error coefficient of DAC and analogue signal circuit and the memory of gain error coefficient, and comprise an ALU, this ALU comprises a computing circuit, this computing circuit has one and is used for the mlultiplying circuit of the input of DAC and gain error multiplication and one are added to the add circuit of input signal with offset error coefficient, with the gain and the offset error of compensation DAC and analogue signal circuit.
In a preferred embodiment, this digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can among the digital calibration circuit or outside.But this memory can be user's access programmable storage.
Feature of the present invention also is a kind of integrated digital calibration circuit and digital to analog converter, comprise a digital to analog converter (DAC) and a digital calibration circuit, this digital calibration circuit comprises and is used to store the predetermined zero graduation of DAC and memory and ALU of full-scale error coefficient, this ALU comprises a computing circuit, be used for that algebraically merges zero graduation output and desirable output and by least significant bit (LSB) value to its normalization with acquisition zero graduation error coefficient, and merge full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these error coefficients are applied to zero graduation and the full-scale error of input signal of DAC to compensate described DAC.
In a preferred embodiment, this digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can among the digital calibration circuit or outside.But this memory can be user's access programmable storage.
Feature of the present invention also is a kind of digital calibration system, and this system comprises an integrated digital calibration circuit and digital to analog converter, comprises the analogue signal circuit of a digital to analog converter (DAC) and this DAC of response.Digital calibration circuit comprises that one is used to store the predetermined zero graduation of DAC and analogue signal circuit and memory and ALU of full-scale error coefficient, this unit comprises a computing circuit, be used for that algebraically merges zero graduation output and desirable output and by least significant bit (LSB) value to its normalization with acquisition zero graduation error coefficient, and merge full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these error coefficients are applied to zero graduation and the full scale offset error of the input signal of DAC with compensation DAC and analogue signal circuit.
In a preferred embodiment, this digital calibration circuit and DAC can be on same integrated circuit (IC) chip.This memory can among the digital calibration circuit or outside, but and this memory can be user's access programmable storage.
Description of drawings
Other purpose of the present invention, feature and advantage those skilled in the art are according to becoming apparent below in conjunction with the description of accompanying drawing to a preferred embodiment.Wherein:
Fig. 1 illustrates the figure of end point error as digital to analog converter (DAC) transfer function of gain and offset error.
Fig. 2 illustrates the figure of end point error as the digital to analog converter transfer function of zero graduation and full-scale error.
Fig. 3 is according to the integrated digital calibration circuit of use gain of the present invention and offset coefficient and the simplified schematic block diagram of DAC.
To be using gain come the more detailed schematic block diagram of a part of three different embodiment of the digital calibration circuit of compensating gain and offset error with offset coefficient to Fig. 4 A-C.
Fig. 5 is according to the integrated digital calibration circuit of the employing zero graduation of the Fig. 3 of being similar to of the present invention and full scale coefficients and the view of DAC.
Fig. 6 is according to the integrated digital calibration circuit of the employing software-driven calibration system of the Fig. 3 of being similar to of the present invention and the view of DAC.
Fig. 7 is the flow chart of software of the calibration system of application drawing 6.
Embodiment
Except the preferred embodiment or each preferred embodiment that describes below, the present invention can also have other embodiment and implement in every way.Therefore, be appreciated that the present invention is not limited in the arrangement that is applied to following description or shown concrete structure of accompanying drawing and element.
For the purpose of any control or adjusting, the present invention attempts to regulate the DAC end points or DAC adds the analog signal current link end points.But one of them prior application is correct end point errors such as zero graduation, full-scale error and gain and offset error.This error correction application is the disclosed theme of specific embodiment, but limits the scope of the invention anything but, and scope of the present invention comprises the end points adjusting of carrying out for any reason.
Digital to analog converter (DAC) transfer function end point errors can be counted as gain and offset error or regard zero graduation as and full-scale error.Fig. 1 shows the view of gain and offset error approach.A desirable DAC transfer function 10 starts from 0. 12, and has a predetermined slope or gain.The deviation post 16 that actual transfer function 14 starts from being offset zero point usually, this introduces offset error and will have one and is different from the slope of ideal dumping function 10 or the slope or the gain of gain.The deviation that this gain error and offset error cause forms gain and offset error 18 altogether.Usually the coefficient of proofreading and correct offset error is represented as c, and the coefficient of correct for gain error is represented as m.
In another view 2, end point error is considered to zero graduation error 20 and full-scale error 22.The appearance of this zero graduation error is because the dead-center position of transfer function 24 is inconsistent with desirable dead-center position 26, and the appearance of full-scale error is because this full scale point changes also error owing to zero position 23 with the error of gain that influence transfer function 24 or slope.
According to another embodiment of the invention, among Fig. 3, DAC30 and digital calibration circuit 32 are integrated on the chip 34.Calibration system 36 reads the output of DAC30 at 38 places, or reads if desired from the output at output 42 places of the output of DAC30 and analogue signal circuit subsequently or analog signal link 40.Can compensate the error of the whole analog link that comprises DAC by this way.Perhaps, signal is coupled to calibration system 36 by circuit 44, and transmission offset error coefficient c of this system and gain error Coefficient m are to digital calibration circuit 32, and these values are used to calculate y there, and wherein x is an input signal, and y is an output signal.Simple table is shown:
y＝mx+c (1)
Wherein y is output, and m is gain or slope error coefficient, and c is an offset coefficient, and x is input.
Equation 1 is a typical general specification linear algebra expression formula, and this expression formula acquiescence is used real number.Under the situation of digital to analog converter, the input of the numeral of this DAC has the resolution of limited quantification.Therefore, the finite resolving power numeral of quantification is suitable in the expression formula of DAC.For this reason, use a kind of modification of this expression formula in the reality:
y＝((m+c2)/d)＊x+c (2)
Wherein, c2 is the second constant numeric item, and d is a divisor factor that is used to dwindle the output number.
A specific preferred embodiment is:
y＝((m+1)/2＾N)＊x+c (3)
If gain factor (m) has N significance bit of resolution, then maximum (or full scale) m value=2^N-1.In formula (2), during full scale m (m=2^N-1), this actual gain=(2^N-1+1)/2^N=1.
For the purpose of implementing, in formula (2), select the factor "+1 ".M=2^N-1=〉gain=1.Can use any numeric constant except+1.Similarly, be equal to from the output of digital multiplier divided by the computing of 2^N and locate tap,, and also can select different divisor factor as known in those skilled in the art.
For greater than 1 gain, the scope of m+1 is greater than divisor factor d.
The value of m and c can be stored in the memory 50, this memory can be positioned on the chip 3, but outside digital calibration circuit 32, perhaps they are comprised in the memory 50 ' of digital calibration circuit 32, perhaps are arranged in outside DAC30 and digital calibration circuit 32 and the chip 34 and are shown memory 50 ".When memory 50 is provided outside chip 34 " time; it can be configured to can be by user access and programming; make and to be not only input signal x, and offset coefficient c and gain coefficient m also can be selected to compensate the error that DAC error or compensation DAC sum of errors are produced by the one or more follow-up analogue signal circuit in the link 40.
Among Fig. 3, be included in the digital calibration circuit 32 be an ALU 33 as computing circuit 52, it comprises a multiplier 54 and adder 56, as shown in Figure 4, thereby computing circuit 52 is carried out formula y=mx+c.Multiplier 54 receives the x input, and multiply by Coefficient m, then in adder 56 with coefficient c addition, produce output y.Perhaps, among Fig. 4 B, arithmetical unit 32a can comprise an additional divider 55, to obtain exporting y=mx/d+c.That is to say that the product p that divider 55 is imported x and gain skew m with DAC obtains a merchant q divided by d, this merchant then with skew c addition in adder 56, wherein d is a divisor factor that is used to dwindle the output numeral.Or as among Fig. 4 C as shown in the 52b, can have an adder 57, its merge coefficient c2 59 is to obtain exporting y=(m+c2) * x/d+c.That is to say, gain skew m and DAC input x multiply each other obtain product p before, this gain skew and one second constant c2,59 merging.
Perhaps as shown in Figure 5, the computing circuit 52a among the ALU 33a among the digital calibration circuit 32a can produce a zero graduation error coefficient zs and full scale coefficients fs, perhaps they is offered digital calibration circuit 32a together with input signal x.With with identical before mode, memory 50a, 50a ', 50a " carry out in a similar fashion just for full scale coefficients fs and zero graduation coefficient zs.Calibration system 36 can comprise the combination of hardware circuit or hardware circuit and software, reads the output of zero graduation and full scale in calculating zs and fs coefficient or m and c coefficient process.Among Fig. 6, calibration system 36b comprises an ADC at its input, 37 ' of ADC37 or inside, and the conversion of signals that this ADC is used for the analogue signal circuit chain at 42b place is that digital form is to be used for design factor in arithmetical operation.Analogue signal circuit (chain) 40b also can comprise Vref+ circuit 51 and Vref-circuit 53, also can be realized by software fully in calibration system 36b.Among Fig. 6, can calculate zs and fs coefficient or m and c coefficient at three phases 1,2 and 3.Shown in the software flow of Fig. 7.
Among Fig. 7, calibration cycle is measured the voltage/current output of DAC or analogue signal circuit chain 40 then from the input of step 100 at reset DAC in step 102.In step 104, this DAC is set to full scale and measures output once more then.In step 106, the output of DAC30 or analogue signal circuit chain 40 is used to design factor m and c.In step 108, calculate the size of LSB.In step 110, calculate the c/zs item, calculate m in step 112 afterwards.Calculate dfs in step 114.In step 116, c/zs and m are quantized then, and in step 118, c/zs and fs are quantized.In step 120, calculate fs.In step 122, c/zs and fs are quantized.
In order to utilize zero graduation zs coefficient and full scale fs coefficient to come correct end point errors, can deduct the desirable voltage output of zero graduation by the voltage output of algebraic addition zero graduation and obtain coefficient zs with its normalization or divided by the least significant bit size.
Can pass through algebraic addition V
OutFull scale deducts V
OutThe full scale ideal is also standardized with the least significant bit size and is obtained full scale correction coefficient fs.
Notice that calibration system 36 can comprise that software, DSP or microcontroller or miscellaneous equipment are to determine m and c or zs and fs.
Example 1: calculate m and c coefficient with correcting gain and offset error
Vref+＝4.096v
Vref-＝0v
DAC resolution, N=12
Therefore, desirable LSB=4.096-0/2
11=1mv
Step 100=〉102=〉Voutzs=-10mv
Step 100X106=〉Voutfs=4.115v
New step: calculating LSB size=(Voutfs-Voutzs)/(2
11-1)=(4.115-0.01)/4095=1.002442mv
Calculating c/zs=-(Voutzs-Voutzsideal)/LSB size=-(0.01-0)/LSB size=9.9756
Quantize c/zs to required resolution (12b)=10
Calculate (4.115-0.010)=0.997564 of the desirable output area of m=/(Voutfs-Voutzs)=4.095/
Quantize m to required level (12b)=4086
Example 2: calculate zs and fs coefficient to eliminate zero graduation and full-scale error
We can extension examples 1 and use the new coefficient of the following calculating of identical data:
Be provided with dfs=-(Voutfs-Voutfs-ideal)/LSB size=-(4.115v-4.096)/1.002442mv=18.954=18.954LSB
Quantize dfs to 12b (LSB) level: dfs → 19LSB
Fs=Voutfs/LSB size=4.115/1.002442mv=4104.97565 is set
Quantize fs to 12b (LSB) grade: fs → 4105
Though special characteristic of the present invention illustrates in some drawings not in other accompanying drawing, this just for convenience because each feature can with of the present invention arbitrarily or all further features merge.Word used herein " comprises ", " comprising ", " having " reach " with " should explain widely and understand, should not be limited to and anyly physically interconnect.And any embodiment disclosed in the application should not be considered to unique possible embodiment.
Those skilled in the art expect other embodiment easily and comprise in the following claims.
Claims (58)
1. an integrated programmable digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC); With
Digital calibration circuit, the memory that comprises the predetermined end point coefficient that is used to store described digital to analog converter transfer function, with being used for end point coefficients is applied to the ALU of DAC input signal with the end points of regulating described DAC, described end point coefficients comprises zero graduation and full scale coefficients.
2. integrated programmable digital calibration circuit and digital to analog converter as claimed in claim 1, wherein, described ALU comprises a computing circuit, be used for output of algebraically count of zero scale and desirable output, and by least significant bit (LSB) value with their normalization to obtain the zero graduation coefficient, and the merging full scale is exported and desirable output, and by LSB their is standardized with the acquisition full scale coefficients, and these coefficients is applied to the input signal of DAC.
3. integrated programmable digital calibration circuit and digital to analog converter as claimed in claim 1, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
4. integrated programmable digital calibration circuit and digital to analog converter as claimed in claim 3, wherein, described memory is in described digital calibration circuit.
5. integrated programmable digital calibration circuit and digital to analog converter as claimed in claim 3, wherein, described memory is in the outside of described digital correction circuit.
6. integrated programmable digital calibration circuit and digital to analog converter as claimed in claim 3, wherein, described memory is the accessible programmable storage of user.
7. programmable digital calibration system that comprises integrated digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC);
Respond the analogue signal circuit of described DAC; And
Digital calibration circuit comprises the memory of the predetermined end point coefficient that is used to store the digital to analog converter transfer function; With being used for these end point coefficients are applied to the ALU of DAC input signal with the end points of regulating described DAC and described analogue signal circuit, described end point coefficients comprises zero graduation and full scale coefficients.
8. the integrated digital calibration circuit and the system of digital to analog converter of comprising as claimed in claim 7, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
9. the integrated digital calibration circuit and the system of digital to analog converter of comprising as claimed in claim 8, wherein, described memory is in digital calibration circuit.
10. the integrated digital calibration circuit and the system of digital to analog converter of comprising as claimed in claim 8, wherein, described memory is in the outside of digital calibration circuit.
11. the integrated digital calibration circuit and the system of digital to analog converter of comprising as claimed in claim 8, wherein, described memory is the accessible programmable storage of user.
12. integrated digital calibration circuit able to programme and digital to analog converter comprise:
Digital to analog converter; With
Digital calibration circuit, comprise and be used to store the predetermined migration coefficient of described digital to analog converter (DAC) and the memory of gain coefficient, and ALU, this ALU comprises having and is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient, with be used for the add circuit of offset coefficient and described input signal addition with the gain of regulating described DAC and the computing circuit of skew, described computing circuit comprise be used for before the product of DAC input and gain coefficient and the offset coefficient addition except that the division circuit of this product.
13. integrated digital calibration circuit able to programme as claimed in claim 12 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
14. integrated digital calibration circuit able to programme as claimed in claim 12 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
15. integrated digital calibration circuit able to programme as claimed in claim 12 and digital to analog converter, wherein, described memory is in the outside of described digital calibration circuit.
16. integrated digital calibration circuit able to programme as claimed in claim 12 and digital to analog converter, wherein, described memory is the accessible programmable storage of a kind of user.
17. a programmable digital calibration system that comprises integrated digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC);
Respond the analogue signal circuit of this DAC; And
Digital calibration circuit, comprise and be used to store the predetermined migration coefficient of described DAC and described analogue signal circuit and the memory of gain coefficient, and ALU, this ALU comprises having and is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient, with be used for the add circuit of offset coefficient and described input signal addition with the gain of regulating described DAC and described analogue signal circuit and the computing circuit of skew, described computing circuit comprise be used for before the product of DAC input and gain coefficient and the offset coefficient addition except that the division circuit of described product.
18. integrated digital calibration circuit able to programme as claimed in claim 17 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
19. integrated digital calibration circuit able to programme as claimed in claim 17 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
20. integrated digital calibration circuit able to programme as claimed in claim 17 and digital to analog converter, wherein, described memory is in the outside of described digital calibration circuit.
21. integrated digital calibration circuit able to programme as claimed in claim 17 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
22. integrated digital calibration circuit able to programme and digital to analog converter comprise:
Digital to analog converter (DAC); With
Digital calibration circuit, comprise and be used to store the predetermined zero graduation of this DAC and the memory of full scale coefficients, with the ALU that comprises computing circuit, described computing circuit is used for the output of algebraically merging zero graduation and with desirable output and by least significant bit (LSB) value it is standardized to obtain the zero graduation coefficient, and merge full scale output and desirable output and by LSB value to its normalization with the acquisition full scale coefficients, and these coefficients are applied to zero graduation and the full scale of input signal of DAC to regulate described DAC.
23. integrated digital calibration circuit able to programme as claimed in claim 22 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
24. integrated digital calibration circuit able to programme as claimed in claim 23 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
25. integrated digital calibration circuit able to programme as claimed in claim 23 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
26. integrated digital calibration circuit able to programme as claimed in claim 23 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
27. a programmable digital calibration system that comprises integrated digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC);
Simulation or mixed signal circuit in response to this DAC; And
Digital calibration circuit, comprise and be used to store the predetermined zero graduation of this DAC and analogue signal circuit and the memory and the ALU of full scale coefficients, this ALU comprises a computing circuit, being used for the output of algebraically merging zero graduation standardizes to obtain the zero graduation coefficient to it with desirable output and by least significant bit (LSB) value, and merge full scale output and desirable output and by LSB value to its normalization obtaining full scale coefficients, and these coefficients be applied to the DAC input signal be offset with the zero graduation and the full scale of regulating DAC and analogue signal circuit.
28. integrated digital calibration circuit able to programme as claimed in claim 27 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
29. integrated digital calibration circuit able to programme as claimed in claim 27 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
30. integrated digital calibration circuit able to programme as claimed in claim 28 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
31. integrated digital calibration circuit able to programme as claimed in claim 28 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
32. integrated digital calibration circuit and digital to analog converter comprise:
Digital to analog converter (DAC); With
Digital calibration circuit, the memory and the ALU that comprise the predetermined complement of the end point error that is used to store described digital to analog converter transfer function, this ALU is used for the complement of end point error is applied to this DAC input signal to compensate the end point error of described DAC, and the complement of described end point error comprises zero graduation and full-scale error coefficient.
33. integrated digital calibration circuit as claimed in claim 32 and digital to analog converter, wherein, described ALU comprises computing circuit, being used for the output of algebraically count of zero scale standardizes to obtain the zero graduation error coefficient to it with desirable output and by least significant bit (LSB) value, and and close full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these error coefficients are applied to the input signal of DAC.
34. integrated digital calibration circuit as claimed in claim 32 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
35. integrated digital calibration circuit as claimed in claim 34 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
36. integrated digital calibration circuit as claimed in claim 34 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
37. integrated digital calibration circuit as claimed in claim 34 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
38. a digital calibration system comprises integrated digital calibration circuit and digital to analog converter, comprising:
Digital to analog converter (DAC);
Analogue signal circuit in response to this DAC; And
Digital calibration circuit, memory and an ALU of comprising the predetermined complement of the end point error that is used to store described DAC transfer function, this ALU is used for input signal that the complement with end point error is applied to described DAC to compensate the end point error of described DAC and described analogue signal circuit, and the complement of described end point error comprises zero graduation and full-scale error coefficient.
39. the digital calibration system of integrated digital calibration circuit as claimed in claim 38 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
40. the digital calibration system of integrated digital calibration circuit as claimed in claim 39 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
41. the digital calibration system of integrated digital calibration circuit as claimed in claim 39 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
42. the digital calibration system of integrated digital calibration circuit as claimed in claim 39 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
43. integrated digital calibration circuit and digital to analog converter comprise:
Digital to analog converter (DAC); With
Digital calibration circuit, comprise and be used to store the predetermined zero graduation of this DAC and memory and ALU of full-scale error coefficient, this ALU comprises a computing circuit, being used for the output of algebraically merging zero graduation standardizes to obtain the zero graduation error coefficient to it with desirable output and by least significant bit (LSB) value, and and close full scale output and desirable output and by LSB value to its normalization with acquisition full-scale error coefficient, and these error coefficients are applied to zero graduation and the full-scale error of input signal of DAC to compensate described DAC.
44. integrated digital calibration circuit as claimed in claim 43 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
45. integrated digital calibration circuit as claimed in claim 44 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
46. integrated digital calibration circuit as claimed in claim 44 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
47. integrated digital calibration circuit as claimed in claim 44 and digital to analog converter, wherein, described memory is the accessible programmable storage of user.
48. a digital calibration system that comprises integrated digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC);
Simulation or mixed signal circuit in response to described DAC; And
Digital calibration circuit, comprise and be used to store the predetermined zero graduation of described DAC and analogue signal circuit and memory and ALU of full-scale error coefficient, this unit comprises a computing circuit, being used for the output of algebraically merging zero graduation standardizes to obtain the zero graduation error coefficient to it with desirable output and by least significant bit (LSB) value, and merge full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these coefficients are applied to zero graduation and the full scale offset error of input signal of DAC to compensate this DAC and analogue signal circuit.
49. integrated digital calibration circuit as claimed in claim 48 and digital to analog converter, wherein, described digital calibration circuit and DAC are on same integrated circuit (IC) chip.
50. integrated digital calibration circuit as claimed in claim 49 and digital to analog converter, wherein, described memory is in described digital calibration circuit.
51. integrated digital calibration circuit as claimed in claim 49 and digital to analog converter, wherein, described memory is outside described digital calibration circuit.
52. integrated digital calibration circuit as claimed in claim 49 and digital to analog converter, wherein said memory are the accessible programmable storages of user.
53. an integrated programmable digital calibration circuit and a digital to analog converter comprises:
Digital to analog converter (DAC); With
Digital calibration circuit, the memory that comprises the predetermined end point coefficient that is used to store described digital to analog converter transfer function, with being used for end point coefficients is applied to the ALU of DAC input signal with the end points of regulating described DAC, described end point coefficients comprises offset coefficient and gain coefficient, and described ALU comprises:
Have the computing circuit that is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient,
Be used for offset coefficient add to described input signal add circuit and
Division circuit is used for removing this product before the product with DAC input and gain coefficient adds to offset coefficient.
54. an integrated programmable digital calibration circuit and a digital to analog converter comprises:
Digital to analog converter (DAC); With
Digital calibration circuit, the memory that comprises the predetermined end point coefficient that is used to store described digital to analog converter transfer function, with being used for end point coefficients is applied to the ALU of DAC input signal with the end points of regulating described DAC, described end point coefficients comprises offset coefficient and gain coefficient, and described ALU comprises:
Have the computing circuit that is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient,
Be used for offset coefficient add to described input signal add circuit and
Be used for before gain coefficient and DAC input is multiplied each other, merging the second adder of second constant and gain coefficient.
55. an integrated programmable digital calibration circuit and a digital to analog converter comprises:
Digital to analog converter (DAC); With
Digital calibration circuit comprises the memory of the predetermined end point coefficient that is used to store described digital to analog converter transfer function, and described end point coefficients comprises zero graduation and full scale coefficients; And
Be used for end point coefficients is applied to the ALU of DAC input signal with the end points of regulating described DAC, described ALU comprises a computing circuit, be used for output of algebraically count of zero scale and desirable output, and by least significant bit (LSB) value with their normalization to obtain the zero graduation coefficient, and output of merging full scale and desirable output, and by LSB with their normalization obtaining full scale coefficients, and these coefficients are applied to the input signal of DAC.
56. an integrated programmable digital calibration circuit and a digital to analog converter comprises:
Digital to analog converter; With
Digital calibration circuit, comprise and be used to store the predetermined migration coefficient of described digital to analog converter (DAC) and the memory of gain coefficient, and ALU, this ALU comprises having and is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient, with be used for the add circuit of offset coefficient and described input signal addition with the gain of regulating described DAC and the computing circuit of skew, described computing circuit comprises the second adder that is used for merging second constant and gain coefficient before gain coefficient and DAC input are multiplied each other.
57. a programmable digital calibration system that comprises integrated digital calibration circuit and digital to analog converter comprises:
Digital to analog converter (DAC);
Respond the analogue signal circuit of this DAC;
Digital calibration circuit comprises being used to store the predetermined migration coefficient of described DAC and described analogue signal circuit and the memory of gain coefficient; And
ALU, this ALU comprises having and is used for DAC is imported the mlultiplying circuit that multiplies each other with gain coefficient, with be used for the add circuit of offset coefficient and described input signal addition with the gain of regulating described DAC and described analogue signal circuit and the computing circuit of skew, described computing circuit comprises the second adder that is used for merging second constant and gain coefficient before gain coefficient and DAC input are multiplied each other.
58. integrated digital calibration circuit and digital to analog converter comprise:
Digital to analog converter (DAC); With
Digital calibration circuit comprises the memory of the predetermined complement of the end point error that is used to store described digital to analog converter transfer function, and the complement of described end point error comprises zero graduation and full-scale error coefficient; And
ALU, this ALU is used for the complement of end point error is applied to this DAC input signal to compensate the end point error of described DAC, described ALU comprises computing circuit, being used for the output of algebraically count of zero scale standardizes to obtain the zero graduation error coefficient to it with desirable output and by least significant bit (LSB) value, and and close full scale output and desirable output and by LSB to its normalization obtaining the full-scale error coefficient, and these error coefficients are applied to the input signal of DAC.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US41390902P | 2002-09-26 | 2002-09-26 | |
| US60/413,909 | 2002-09-26 | ||
| US60/414,166 | 2002-09-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1703831A CN1703831A (en) | 2005-11-30 |
| CN100514863C true CN100514863C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB03825221XA Expired - Fee Related CN100514863C (en) | 2002-09-26 | 2003-08-07 | Integrated digital calibration circuit and digital to analog converter (DAC) |
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| Country | Link |
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| CN (1) | CN100514863C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010093683A (en) * | 2008-10-10 | 2010-04-22 | Nec Electronics Corp | Digital/analog conversion circuit and method for correcting output data of the same |
| CN102025374B (en) * | 2010-12-24 | 2013-10-16 | 北京东方计量测试研究所 | Automatic calibration circuit for correcting differential nonlinear error of digital-to-analog converter in real time |
| CN104363390A (en) * | 2014-11-11 | 2015-02-18 | 广东中星电子有限公司 | Lens vignetting compensation method and system |
| CN104734709B (en) * | 2015-01-28 | 2018-06-08 | 广东美的制冷设备有限公司 | The deviation calibration method and device of AD conversion |
| KR102373545B1 (en) * | 2015-11-23 | 2022-03-11 | 삼성전자주식회사 | Circuit and method for generating reference voltage based on temperature coefficient |
| TWI597477B (en) * | 2016-12-29 | 2017-09-01 | 財團法人工業技術研究院 | Microelectromechanical apparatus having a measuring range selector |
| CN111263958B (en) * | 2017-10-30 | 2022-05-27 | 开利公司 | Compensator in detector device |
| CN107846222B (en) * | 2017-11-16 | 2021-02-12 | 上海华虹集成电路有限责任公司 | Gain self-calibration circuit of digital-analog converter |
| CN111983954A (en) * | 2020-08-20 | 2020-11-24 | 济南浪潮高新科技投资发展有限公司 | System and method for synchronizing output waveforms of multi-channel signal generator based on FPGA |
| CN112217517A (en) * | 2020-10-09 | 2021-01-12 | 珠海零边界集成电路有限公司 | Method for adjusting digital-to-analog converter and related equipment |
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| US4829236A (en) * | 1987-10-30 | 1989-05-09 | Teradyne, Inc. | Digital-to-analog calibration system |
| CN1341292A (en) * | 1999-10-27 | 2002-03-20 | 皇家菲利浦电子有限公司 | Digital to analog converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4829236A (en) * | 1987-10-30 | 1989-05-09 | Teradyne, Inc. | Digital-to-analog calibration system |
| CN1341292A (en) * | 1999-10-27 | 2002-03-20 | 皇家菲利浦电子有限公司 | Digital to analog converter |
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| CN1703831A (en) | 2005-11-30 |
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