CN106209107A - The domain structure of current-steering digital-to-analog converter current source array - Google Patents
The domain structure of current-steering digital-to-analog converter current source array Download PDFInfo
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- CN106209107A CN106209107A CN201610607050.5A CN201610607050A CN106209107A CN 106209107 A CN106209107 A CN 106209107A CN 201610607050 A CN201610607050 A CN 201610607050A CN 106209107 A CN106209107 A CN 106209107A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
- H03M1/0845—Continuously compensating for, or preventing, undesired influence of physical parameters of noise of power supply variations, e.g. ripple
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Abstract
The invention discloses the domain structure of the current source array of a kind of current-steering digital-to-analog converter, the high n position of this digital to analog converter input signal is thermometer coding, and the domain structure of described current source array includes by 2nIndividual thermometer type current source cell I1～I2 nThe current source array constituted, each described thermometer type current source cell has M electron current source in parallel, and described current source array includes that M region, each described region include 2nIndividual described electron current source.For arbitrary described thermometer type current source cell, its centre of form is positioned in the geometric center of described current source array and the electron current source of its M parallel connection at least 4 sub-current sources and is evenly distributed in two described regions.The present invention can improve the precision of digital to analog converter.
Description
Technical field
The present invention relates to CMOS Analogical Circuit Technique field, particularly to a kind of current-steering digital-to-analog converter current source array
Domain structure.
Background technology
The thermometer coding of current steer type digital analog converter is a kind of 1 scale coding form, each only " 0 " or
Person " 1 " two states, and " 1 " can only occur in low level continuously, and " 0 " can not occur in the middle of " 1 ", and " 1 " can not occur in
In the middle of " 0 ".Shown in Fig. 1 15 thermometer yardage mode converter structure sketch.It can be seen that it has 15 electric current numbers
Value is all 4I mutually0Current source parallel connection constitute, the path that each current source is corresponding has bi-directional digital switch in order to control
Make the current direction of this current source.This circuit has two-pass DINSAR output, and output electric current is: Ioutput-A=(T15+T14+
T13+…+T2+T1)×(4I0)
Realizing the 4I shown in Fig. 10During current source array, due to process deviation and the impact of thermograde, each electric current
The output of source unit has deviation, therefore requires the highest to the coupling of current source array.The four-quadrant being widely used is random
Swimming type switch (Quad-Quadratic Random Walk Switching, Q2-RW) is commonly used to carry out current source array
Layout.It is illustrated in figure 2 one to have 16 current source cells (current source cell is I1、I2…I16) array structure, by electric current
Source unit distance quantifies and after normalization, as it is shown on figure 3,
Assume that technological parameter and thermograde function are: f (x, y)=a+bx+cx2+dx3+…+ey+gy2+hy3+…+ixy
+ ... (wherein a, b, c, d, e, g, h, i are not all 0), with current source cell I1、I2As a example by, its technological parameter and thermograde are absolute
Value is:
f(I1)=f (1,4)=a+b+c+d+ ...+4e+16g+64h+ ...+4i+ ...
f(I2)=f (4,2)=a+4b+16c+64d+ ...+2e+4g+8h+ ...+8i+ ...
Then I1、I2Because technique and not mating of thermograde are between current source cell:
Δ=f (I1)-f (I2)=-3b-15c-63c+ ...+2e+12g+56h+ ...-4i+ ... ≠ 0
From above formula, I1And I2The mismatch of current source cell comprises single order, second order and higher order term, and numerical value is relatively big, i.e. loses
Joining more serious, this can cause each current source cell to have unequal output absolute value under identical input, makes the essence of transducer
Degree reduces.
Summary of the invention
The main object of the present invention aims to provide a kind of current steering digital-to-analog converter electric current with second order mismatch compensation
Source array domain structure, to improve the precision of digital to analog converter.
For reaching above-mentioned purpose, the present invention provides the domain structure of the current source array of a kind of current-steering digital-to-analog converter,
The high n position of described digital to analog converter input signal is thermometer coding, and the domain structure of described current source array includes by 2nIndividual
Thermometer type current source cell I1～I2 nThe current source array constituted, each described thermometer type current source cell has M also
The electron current source of connection, described current source array includes that M region, each described region include 2nIndividual described electron current source, n is big
In the positive integer equal to 1, M is the even number more than or equal to 4；For arbitrary described thermometer type current source cell, its centre of form is positioned at
In the geometric center of described current source array and its M electron current source in parallel, at least 4 sub-current sources are evenly distributed in two
In individual described region.
Preferably, in described current source array, at least two thermometer type current source cells, it is in described current source battle array
Projected position on the first direction of row domain structure is identical, and projected position in a second direction is the most identical,
Wherein said second direction is vertical with described first direction.
Preferably, the domain structure of described current source array includes 16 thermometer type current source cells, each described temperature
Degree meter type current source cell has 4 electron current sources in parallel, and described current source array includes that 4 are arranged as square region,
Each described region includes that 16 are arranged as square electron current source, and it is several that 4 described regions are formed with described current source array
What center is four quadrants of initial point.
Preferably, four sub-current sources of each described thermometer type current source cell, be evenly distributed with the first, the 3rd as
Limit or second, in fourth quadrant.
Preferably, each described thermometer type current source cell is in the projected position of described first direction and/or second party
To projected position the most misaligned.
Preferably for arbitrary described thermometer type current source cell, its 4 sub-current sources are in the throwing of described first direction
Shadow arranges in the way of X-0-0-X-0-X-X-0 or 0-X-X-0-X-0-0-X, in the throwing of the second direction of described current source array
Shadow arranges in the way of Y-0-0-Y-0-Y-Y-0 or 0-Y-Y-0-Y-0-0-Y, and wherein X, Y represent electron current source, and 0 represents sky.
Preferably, described thermometer type current source cell is controlled to open and close by thermometer-code signal.
The beneficial effects of the present invention is, by the current source array that linear thermometer type current source cell is constituted is turned
It is changed to multiple region being made up of electron current source, and each electron current source is arranged according to certain rules, make each thermometer type electricity
The centre of form of stream source unit is positioned at the geometric center of current source array, can reduce the difference caused by process deviation and thermograde
Mismatch between current source cell, thus improve the precision of digital to analog converter.Additionally, for any one thermometer line current source list
Unit, its electron current source is not to be thoroughly dispersed in different regions, but at least four sub-current sources are evenly distributed in two
In individual region, it is possible to the complexity reducing layout design reduces the parasitic parameter between signal, improves the overall performance of chip.
Accompanying drawing explanation
Fig. 1 is 15 thermometer yardage mode converter structure schematic diagrams of prior art；
Fig. 2 is the structure chart of the four-quadrant random walk formula switch in prior art with 16 current source cells；
Fig. 3 show the schematic diagram after range normalization of the structure shown in Fig. 2；
Fig. 4 is a preferred embodiment of the present invention current source array schematic layout pattern after range normalization.
Detailed description of the invention
For making present disclosure more clear understandable, below in conjunction with Figure of description, present disclosure is made into one
Step explanation.Certainly the invention is not limited in this specific embodiment, the general replacement known to those skilled in the art is also
Contain within the scope of the present invention.
The current-steering digital-to-analog converter of the present invention can be thermometer-code current-steering digital-to-analog converter or stagewise current steer
Digital to analog converter.This enforcement is as a example by the current steering digital-to-analog converter applying 10 in 55nm CMOS technology, to this
Bright it is illustrated.High 4 of this digital to analog converter use thermometer coding form, are converted to linearly by these high 4 binary codes
15 thermometer-codes, thermometer-code signal Ti/TiB (i=1～15, Ti and TiB are complementary signal) controls have electric current respectively
The current source cell of I.
The present invention is when realizing 15 thermometer code current rudder D/A converters, by 16 thermometer type current source cell I1
～I16Constituting current source array, each current source cell is then by 4 sub-current source I'i(i=1～16) is in parallel to be constituted, because of
The size of current of this each electron current source I' is kept to the electric current 1/4th of current source cell I, therefore each thermometer-code letter
4 the sub-current sources of current source cell number controlling its correspondence open or close simultaneously.As shown in Figure 4, current source array includes 4
Individual region (in thick present situation), and each region is made up of 16 sub-current sources, thus by thermometer type current source cell I1
～I16The current source array constituted is laid out in 4 regions, and each region have that size of current is original 1/4th 16
Individual sub-current source, in figure, same numbers is merely representative of the electron current source Simultaneous Switching of same numbers, and numerical order is in no particular order.Need
It should be noted that in the present invention, the electron current source in the same area is not belonging respectively to different thermometer type current source cells.
It practice, the electron current source of at least two parallel connection of same thermometer type current source cell is positioned in the same area.Such as exist
In the present embodiment, the region in bold box just includes 16 electron currents being belonging respectively to 8 different temperatures meter type current source cells
Source is constituted.For any one thermometer type current source cell, its centre of form (i.e. 4 sub-current source I'iThe centre of form) be positioned at electric current
There is certain mirror image relationship in the geometric center of source array, i.e. its electron current source, therefore for any one thermometer type current source
Unit, at least 4 sub-current sources are evenly distributed in two regions.As shown in Figure 4,4 area square arrangements, and often
One region is made up of the electron current sources of 16 square arrangements, and therefore to be positioned at this foursquare for the geometric center of current source array
Center.The most in other embodiments, also can arrange in other shape, such as rectangle or circle etc. in subarray or electron current source.
Owing to current source cell is realized by MOS transistor, and the specification of each MOS transistor is identical, logical in the present embodiment
Cross current source cell is carried out in distance quantify normalizing to X-axis and the two dimensional surface of Y-axis, current source array is corresponded to this two
To facilitate explanation in the X-axis of dimensional plane and the coordinate system of Y-axis.Current source array after assuming with the range normalization shown in Fig. 4
The lower left corner be initial point, then coordinate (the x of the geometric center of current source array0, y0), Geometric center coordinates is in the present embodiment
(4.5,4.5), for 4 sub-current source I' of arbitrary thermometer type current uniti1, I'i2, I'i3, I'i4At this two dimensional surface also
There is its corresponding coordinate, and the coordinate of its X-axis respectively with Geometric center coordinates x0Between difference DELTA xiAnd ∑ Δ xi1
～xi4It is 0, same, in the coordinate of Y-axis difference DELTA y respectively and between Geometric center coordinates y0iAnd ∑ yi1~i4It is 0,
The centre of form that thus can realize thermometer type current source cell overlaps with the geometric center of current source array.In Fig. 4 array
Digitized representation corresponding electron current source, with electron current source I'1As a example by, it is respectively Isosorbide-5-Nitrae at the coordinate of X-axis, and 6, in 7, with geometry
Heart coordinate projection is-3.5 in the difference of the coordinate x0 of X-axis ,-0.5,1.5 and 2.5, itself and be 0.Same, it is projected in Y-axis
Coordinate be respectively 8,5,3 and 2, the difference of the coordinate y0 being projected in Y-axis with Geometric center coordinates is 3.5,0.5 and-1.5 ,-
2.5, itself and be similarly 0.
The centre of form of each thermometer type current source cell is positioned at the geometric center of current source array, it is meant that thermometer current
The projection on X (Y) axle of the coordinate in the electron current source of source unit and Geometric center coordinates projection difference sum on X (Y) axle
Being 0, in other words, the coordinate sum of the electron current source of each thermometer current source unit projection on X (Y) axle is the most all one
Fixed value, X-axis coordinate sum is Geometric center coordinates X-axis coordinate x in the present embodiment04 times, Y-axis coordinate sum is geometry
The Y-axis coordinate y at center04 times.
According to technique and thermograde field function it is: f (x, y)=a+bx+cx2+dx3+…+ey+gy2+hy3+…+ixy
+ ... (wherein a, b, c, d, e, g, h, i are not all 0), after observing array, if f1, f2 are real number, obtain such as following formula:
f(I1)=f (1,3)+f (4,5)+f (6,8)+f (7,2)=f1
f(I2)=f (2,7)+f (3,6)+f (5,4)+f (8,1)=f2
Substitute into technique and thermograde function f (x, after y) calculating, obtains:
F1=a+18b+ ...+18e+ ...+85i+ ...
F2=a+18b+ ...+18e+ ...+85i+ ...
F1, f2 are the absolute value of each unit, current source cell I1And I2Between single order mismatch be Δ f12=f1-f2.
According to above formula it is found that pass through the layout design of the array structure of the present invention, current source cell I1And I2Between
Single order mismatch is all 0, thus can realize the mismatch between current source cell and reduce.
On the other hand, the foursquare center formed due to 4 regions is the geometric center of current source array, if
With the geometric center of this current source array as initial point, 4 regions constitute four quadrants.Each thermometer type current source list
Four sub-current sources of unit, are all to be evenly distributed in first, third quadrant or second, fourth quadrant.Such as electron current source I'1
Be distributed only over second and fourth quadrant in, electron current source I'3Be distributed only over first and third quadrant in.The present embodiment is in each temperature
On the premise of the centre of form of degree meter type current source cell is positioned at the geometric center of current source array, by each thermometer type current source
Four sub-current source mean allocation of unit are in two regions rather than be dispersed in four regions, beneficially parasitic between signal
The reduction of parameter and the raising of chip overall performance.
It is also preferred that the left in order to reduce current source cell mismatch further, in the current source array domain structure of the present invention, extremely
Rare two thermometer type current source cells, it is identical with the projected position in Y-direction normal thereto in X-direction, right
Should be identical with the projected position in Y-axis in X-axis after range normalization.As shown in Figure 4, current source cell I1And I7?
The coordinate that range normalization is projected on X (Y) axle is identical, and the coordinate being projected in X-axis is respectively Isosorbide-5-Nitrae, and 6 and 7 are projected in
Coordinate in Y-axis is respectively 8,5,3 and 2, then
f(I1)=f (I7)=f (1,8)+f (4,5)+f (6,3)+f (7,2)=f1
Current source cell I1And I7Output absolute value equal, reach to mate completely.
Further, in order to make the matching degree between current source cell higher, need to make the identical energy of projection coordinate
The current source cell that enough realizations are mated completely is more, and therefore array domain structure to be designed by the present invention further so that
For a thermometer type current source cell, its electron current source (i.e. carries out distance measurements the projected position of X-direction is misaligned
Change after normalizing misaligned in the projection coordinate of X-direction), and projected position in the Y direction is misaligned (i.e. carries out distance to quantify to return
After one, the projection coordinate in Y direction is misaligned), it is possible to increase the current source cell with same projection coordinate.Please join
Examine Fig. 4, in the laying out pattern after the distance normalizing shown in Fig. 4 quantifies, 4 sub-current sources of each thermometer type current unit
4 coordinates corresponding in X-axis are different, the most different, thus at 4 coordinates that Y-axis is corresponding equally, it is possible to achieve 4
Thermometer type current unit X-axis project after coordinate identical and Y-axis project after coordinate identical, in the present embodiment, current source
Unit I1, I7, I10And I16It is all Isosorbide-5-Nitrae that 4 the sub-current sources of each are projected in 4 coordinates of X-axis, and 6 and 7 are projected in the 4 of Y-axis
Individual coordinate is 8,5,3 and 2；Current source cell I2, I8, I9And I154 the sub-current sources of each are projected in 4 coordinates of X-axis
Being 2,3,5 and 8,4 coordinates being projected in Y-axis are 7,6,4 and 1；Current source cell I3, I5, I12And I14Each 4
Electron current source is projected in 4 equal Isosorbide-5-Nitraes of coordinate of X-axis, 6 and 7, and 4 coordinates being projected in Y-axis are 7,6,4 and 1；Current source list
Unit I4, I6, I11And I13It is 2,3,5 and 8 that 4 the sub-current sources of each are projected in 4 coordinates of X-axis, is projected in 4 of Y-axis
Coordinate is 8,5,3 and 2.If f1, f2, f3, f4 are real number, obtain such as following formula:
F (I1)=f (I7)=f (I10)=f (I16)=f (1,8)+f (4,5)+f (6,3)+f (7,2)=f1
F (I2)=f (I8)=f (I9)=f (I15)=f (2,7)+f (3,6)+f (5,4)+f (8,1)=f2
F (I3)=f (I5)=f (I12)=f (I14)=f (1,7)+f (4,6)+f (6,4)+f (7,1)=f3
F (I4)=f (I6)=f (I11)=f (I13)=f (2,8)+f (3,5)+f (5,3)+f (8,2)=f4
Current source cell I1, I7, I10And I16Current source mismatch be 0, i.e. under identical input, this four current sources defeated
Go out absolute value equal, reach to mate completely.Additionally also have three groups of current source (respectively I2, I8, I9And I15、I3, I5, I12And I14With
And I4, I6, I11And I13) also it is 0 with the mismatch between group.
Further, in order to reduce the second order mismatch between difference group current source cell, in the present embodiment, Mei Yiwen
The projection in the X direction of 4 sub-current sources of degree meter type current source cell is with X-0-0-X-0-X-X-0 or 0-X-X-0-X-0-0-
The mode of X arranges, and the mode of projection Y-0-0-Y-0-Y-Y-0 or 0-Y-Y-0-Y-0-0-Y in the Y direction arranges that (X, Y represent
Electron current source, 0 represents sky) it is positioned at domain structure geometric center reaching the centre of form of current source cell, and 4 groups of thermometer types electricity
Flow in source unit and reduce with coupling, the second order of the different current source cell organized and three rank mismatches completely between the current source cell of group
Optimum efficiency.Specifically, when 4 sub-current sources of each thermometer type current source cell arrange in the above described manner, belong to
The coordinate square sum of the electron current source of the thermometer current source unit of different groups projection on X (Y) axle is the most identical.
According to technique and thermograde field function it is: f (x, y)=a+bx+cx2+dx3+…+ey+gy2+hy3+…+ixy
+ ... (wherein a, b, c, d, e, g, h, i are not all 0), after observing array, if f1, f2 are real number, obtain such as following formula:
F (I1)=f (I7)=f (I10)=f (I16)=f (1,8)+f (4,5)+f (6,3)+f (7,2)=f1
F (I2)=f (I8)=f (I9)=f (I15)=f (2,7)+f (3,6)+f (5,4)+f (8,1)=f2
F (I3)=f (I5)=f (I12)=f (I14)=f (1,7)+f (4,6)+f (6,4)+f (7,1)=f3
F (I4)=f (I6)=f (I11)=f (I13)=f (2,8)+f (3,5)+f (5,3)+f (8,2)=f4
Substitute into technique and thermograde function f (x, after y) calculating, obtains:
F1=a+18b+102c+624d+ ...+18e+102g+672h+ ...+85i+ ...
F2=a+18b+102c+672d+ ...+18e+102g+624h+ ...+85i+ ...
F3=a+18b+102c+624d+ ...+18e+102g+624h+ ...+77i+ ...
F4=a+18b+102c+672d+ ...+18e+102g+672h+ ...+77i+ ...
F1, f2, f3, f4 are the absolute value of each unit, then not mating between each current source of different groups is:
Δ 12=f1-f2=-48d+ ...+48h+ ...
Δ 13=f1-f3=...+48h+ ...+8i+ ...
Δ 14=f1-f4=-48d+ ...+8i+ ...
Δ 23=f2-f3=+48d+ ...+8i+ ...
Δ 24=f2-f4=...-48h+ ...+8i+ ...
Δ 34=f3-f4=-48d+ ...-48h+ ...
Coordinate square sum due to the projection on X (Y) axle of the electron current source of thermometer current source unit of difference group
The most identical, the most not only single order mismatch is all the most remaining xy item, second order and three rank mismatch term coefficients in 0, and second order mismatch term
Less.Additionally second order, three rank mismatch term numerals between different group current source cells are equal, permissible in the case of opposite polarity
Divide out, further reduce deviation, improve the coupling between current source.
In sum, the present invention proposes the domain structure of the current source array of a kind of current-steering digital-to-analog converter, passes through
The current source array that linear thermometer type current source cell is constituted is divided into multiple region being made up of electron current source, and will
Each electron current source arranges according to certain rules, makes the centre of form of each thermometer type current source cell be positioned at the geometry of current source array
The multiple electron current sources belonging to same temperature meter type current source cell are arranged in the same area by center simultaneously, can reduce by
Mismatch between the different current source cells that process deviation and thermograde cause, reduces the parasitic parameter between signal, thus carries
The precision of high digital to analog converter and the overall performance of chip.
Although the present invention discloses as above with preferred embodiment, right described many embodiments are illustrated only for the purposes of explanation
, it being not limited to the present invention, those skilled in the art can make without departing from the spirit and scope of the present invention
Some changes and retouching, the protection domain that the present invention is advocated should be as the criterion with described in claims.
Claims (7)
1. a domain structure for the current source array of current-steering digital-to-analog converter, the high n of described digital to analog converter input signal
Position is thermometer coding, it is characterised in that the domain structure of described current source array includes by 2nIndividual thermometer type current source list
Unit I1～I2 nThe current source array constituted, each described thermometer type current source cell has M electron current source in parallel, described
Current source array includes that M region, each described region include 2nIndividual described electron current source, n is the positive integer more than or equal to 1, M
For the even number more than or equal to 4；For arbitrary described thermometer type current source cell, its centre of form is positioned at the several of described current source array
In what center and its M electron current source in parallel, at least 4 sub-current sources are evenly distributed in two described regions.
The current source array domain structure of current-steering digital-to-analog converter the most according to claim 1, it is characterised in that described
In current source array, at least two thermometer type current source cells, it is in the first party of described current source array domain structure
Projected position upwards is identical, and projected position in a second direction is the most identical, wherein said second direction with
Described first direction is vertical.
The current source array domain structure of current-steering digital-to-analog converter the most according to claim 1, it is characterised in that described
The domain structure of current source array includes that 16 thermometer type current source cells, each described thermometer type current source cell have
4 electron current sources in parallel, described current source array includes that 4 are arranged as square region, and each described region includes 16
Be arranged as square electron current source, 4 described regions formed with the geometric center of described current source array as initial point four as
Limit.
The current source array domain structure of current-steering digital-to-analog converter the most according to claim 3, it is characterised in that each
Four sub-current sources of described thermometer type current source cell, are evenly distributed in first, third quadrant or second, fourth quadrant
In.
The current source array domain structure of current-steering digital-to-analog converter the most according to claim 4, it is characterised in that each
Described thermometer type current source cell does not weighs at the projected position of described first direction and/or the projected position of second direction
Close.
6. according to the current source array domain structure of the current-steering digital-to-analog converter described in claim 4 or 5, it is characterised in that
For arbitrary described thermometer type current source cell, its 4 sub-current sources in the projection of described first direction with X-0-0-X-0-
The mode of X-X-0 or 0-X-X-0-X-0-0-X arranges, in the projection of second direction of described current source array with Y-0-0-Y-0-
The mode of Y-Y-0 or 0-Y-Y-0-Y-0-0-Y arranges, and wherein X, Y represent electron current source, and 0 represents sky.
The current source array domain structure of current-steering digital-to-analog converter the most according to claim 1, it is characterised in that described
Thermometer type current source cell by thermometer-code signal control open and close.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107704647A (en) * | 2017-08-18 | 2018-02-16 | 杰华特微电子（张家港）有限公司 | Current D-A conveter and its layout method |
| WO2019114639A1 (en) * | 2017-12-11 | 2019-06-20 | 北京展讯高科通信技术有限公司 | Arrangement method for dac current source array, and common-source current source array layout |
| CN115033044A (en) * | 2021-03-05 | 2022-09-09 | 龙芯中科技术股份有限公司 | Current source module, voltage stabilizing method, digital-to-analog converter and equipment |
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| CN107704647A (en) * | 2017-08-18 | 2018-02-16 | 杰华特微电子（张家港）有限公司 | Current D-A conveter and its layout method |
| WO2019114639A1 (en) * | 2017-12-11 | 2019-06-20 | 北京展讯高科通信技术有限公司 | Arrangement method for dac current source array, and common-source current source array layout |
| US10756750B2 (en) | 2017-12-11 | 2020-08-25 | Beijing Unisoc Communications Technology Co., Ltd. | Method for arranging current source array of digital-to-analog converter and layout of common-source current source array |
| CN115033044A (en) * | 2021-03-05 | 2022-09-09 | 龙芯中科技术股份有限公司 | Current source module, voltage stabilizing method, digital-to-analog converter and equipment |
| CN115033044B (en) * | 2021-03-05 | 2024-03-15 | 龙芯中科技术股份有限公司 | Current source module, voltage stabilizing method, digital-to-analog converter and equipment |
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